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Smart Power Supply
S8AS
CSM_S8AS_DS_E_8_1
A New Type of Power Supply That
Provides Safety and Maintainability
• 240- and 480-W power supplies with and digital circuit
protectors in a single package.
• Each branch output tripping current value can be easily
set at 0.1-A increments.
• Startup and shutdown sequence control included.
• Various monitor displays and alarms (output voltage,
output current, maintenance forecast monitor,
temperature).
• Conforms to UL Class 2
• Mounts to DIN Rail.
For the most recent information on models that have been
certified for safety standards, refer to your OMRON website.
Refer to Safety Precautions for All Power Supplies and Safety
Precautions on page 23.
Model Number Structure
Model Number Legend
S8AS-@@@@@@
1
2
3
1. Capacity
240: 240 W
480: 480 W
3. Additional Functions
Blank: Changeable parameter settings with no communications
N:
Unchangeable parameter settings with no communications
R:
Changeable parameter settings with communications (RS-485)
2. Number of Output Branches
06: 6 branch outputs
08: 8 branch outputs
Ordering Information
S8AS
Capacity
Input voltage
Output
voltage
Maximum cutoff
output current
(per branch)
240 W
10 A
100 to
240 VAC
480 W
Total
output
current
24 V
Number
Communications
of output
functions
branches
6 branch
outputs
3.8 A
20 A
8 branch
outputs
Parameter
settings
Model
None
Changeable
S8AS-24006
None
Not changeable S8AS-24006N
RS-485
Changeable
S8AS-24006R
None
Changeable
S8AS-48008
None
Not changeable S8AS-48008N
RS-485
Changeable
S8AS-48008R
Be sure to read and fully understand the content of the S8AS User's Manual (Cat. No. Z269) before changing settings on the S8AS.
1
S8AS
Specifications
S8AS-24006@
Item
100 to 240 VAC (85 to 264 VAC)
Frequency *1
50/60 Hz (47 to 63 Hz)
Output
conditions
100-V input
3.8 A max.
200-V input
2.0 A max.
Power factor
EN61000-3-2
100-V input
0.5 mA max.
200-V input
1.0 mA max.
Inrush current 100-V input
*2
200-V input
25 A max. (for a cold start at 25°C)
Number of branches
6
Maximum cutoff output current (per branch)
3.8 A
Total output current
10 A
Allowable voltage range *3
±10% (with V.ADJ)
Ripple noise voltage
2.0% [P-P] max. (for rated input and output voltage) *4
Output leakage current
10 mA max.
Input fluctuation
0.5% max. (Input: 85 to 264 VAC, 100% load) *5
Load fluctuation (rated input voltage)
4.0% max. (rated input, 0% to 100% load) *5
50 A max. (for a cold start at 25°C)
Temperature fluctuation
0.05%/°C max.
Startup time *2
3,000 ms max. (for rated input and output voltage) *4
Output hold time *2
20 ms max. (for rated input and output voltage) *4
Abnormal voltage tripping
28.8 V (Cannot be changed.)
Abnormal current tripping *2
Setting range: 0.5 to 3.8 A
(in 0.1-A increments)
Abnormal total current tripping
Branch outputs are cut off when the total output current is more than 17 A for 2 s, 15 A for 5 s, 13 A for 10 s, or 12 A for 20 s.
Tripping alarm output
Photoswitch output
30 VDC max. and 50 mA max., Leakage current: 0.1 mA max., Residual voltage: 2 V max.
Undervoltage
detection
functions
Undervoltage detection
Setting range: 18.0 to 26.4 V
(in 0.1-V increments)
Undervoltage detection output
Photoswitch output
30 VDC max. and 50 mA max., Leakage current: 0.1 mA max., Residual voltage: 2 V max.
Maintenance
forecast
monitor
function
Maintenance forecast monitor
Setting range: 0.0 to 5.0 yr
(in 0.5-yr increments)
Maintenance forecast monitor
output
Photoswitch output
30 VDC max. and 50 mA max., Leakage current: 0.1 mA max., Residual voltage: 2 V max.
Overtemperature
detection
function
Over-temperature
Setting range: 25 to 90°C
(in 1°C increments)
Over-temperature output
Photoswitch output
30 VDC max. and 50 mA max., Leakage current: 0.1 mA max., Residual voltage: 2 V max.
Output voltage display
Display range:17.0 to 30.0 V
Display accuracy: 2% rdg ±1 digit max.
Output current display
Branch output display range: 0.0 to 4.0 A
Peak output current display range: 0.0 to 20.0 A
Total current display range: 0.0 to 40.0 A
Display accuracy: 5% FS (4 A) ±1 digit max.
Maintenance forecast monitor
display
Display range: FUL (Full)/HLF (Half)/0.0 to 5.0 yr
Temperature display
Display range: −20 to 100°C
Display accuracy: 2°C ±1 digit max.
Tripping
functions
Display
functions
Functions
S8AS-24006R
0.95 min.
Harmonic current
Leakage
current
S8AS-24006N
80% min.
Voltage range *1
Current
Input
conditions
S8AS-24006
Model
Efficiency (Typ.)
3.8 A (Cannot be changed.)
20.0 V (Cannot be changed.)
0.5 yr (Cannot be changed.)
90°C (Cannot be changed.)
Setting range: 0.5 to 3.8 A
(in 0.1-A increments)
Setting range: 18.0 to 26.4 V
(in 0.1-V increments)
Setting range: 0.0 to 5.0 yr
(in 0.5-yr increments)
Setting range: 25 to 90°C
(in 1°C increments)
The input can be enabled or disabled for
each branch output.
19.2 to 30.0 VDC, minimum signal
width: 10 ms, tripping after input within
20 ms + the shutdown sequence set
time
All branch outputs: Enabled
(Cannot be changed.)
19.2 to 30.0 VDC, minimum signal
width: 10 ms, tripping after input within
20 ms + the shutdown sequence set
time
The input can be enabled or disabled for
each branch output.
19.2 to 30.0 VDC, minimum signal
width: 10 ms, tripping after input within
20 ms + the shutdown sequence set
time
Startup sequence
Setting range: 0.0 to 99.9 s in 0.1-s
increments
Branch output 1: 0.0 s
(Cannot be changed.)
Branch output 2: 0.4 s
(Cannot be changed.)
Branch output 3: 0.8 s
(Cannot be changed.)
Branch output 4: 1.2 s
(Cannot be changed.)
Branch output 5: 1.6 s
(Cannot be changed.)
Branch output 6: 2.0 s
(Cannot be changed.)
Setting range: 0.0 to 99.9 s in 0.1-s
increments
Shutdown sequence
Setting range: 0.0 to 99.9 s in 0.1-s
increments
All branch outputs: 0.0 s
(Cannot be changed.)
Setting range: 0.0 to 99.9 s in 0.1-s
increments
Communications
Not supported
Sampling period
1 ms
Parallel connection
Not supported
Series connection
Not supported
External Tripping Input
Supported (RS-485)
Note: Refer to the next page for information on *1 to *5.
2
S8AS
Item
Others
Model
S8AS-24006
S8AS-24006N
S8AS-24006R
Ambient operating temperature
Refer to the derating curve (no icing or condensation). *2
Storage temperature
−25 to 65°C
Ambient operating humidity
25% to 85% (storage: 25% to 90%)
Withstand voltage
3.0 kVAC for 1 min between all input terminals collectively and all branch output, all I/O signal, and all communications
terminals collectively (Detection current: 20 mA)
2.0 kVAC for 1 min between all inputs and protective earth (Detection current: 20 mA)
1.0 kVAC for 1 min between protective earth and all branch output, all I/O signal, and all communications terminals
collectively (Detection current: 20 mA)
500 VAC for 1 min between all branch output and all I/O signal/communications terminals collectively
(Detection current: 20 mA)
500 VAC for 1 min between all I/O signal terminals collectively and communications terminals collectively
(Detection current: 20 mA)
500 VAC for 1 min between all I/O signal terminals collectively and all output signal terminals collectively
(detection current: 20 mA)
Insulation resistance
100 MΩ min. at 500 VDC between the protective earth terminal or all input terminals collectively and all branch output,
all I/O signal, and all communications terminals collectively
Vibration resistance
No abnormality after 10 to 55 Hz at 0.375-mm single amplitude for 2 h each in 3 directions.
Shock resistance
No abnormality after 150 m/s2 3 times each in 6 directions.
Output indicator
Provided (Color: green)
Conducted EMI
Conforms to EN 61204-3 Class A and FCC Class A.
Radiated EMI
Conforms to EN 61204-3 Class A.
Safety standards
cULus: UL508 (Listing. Class2: Per UL1310), CSA C22.2 No.107.1 (Class2: Per CSA C22.2 No.223)
cURus: UL60950-1, CSA C22.2 No.60950-1
EN: EN50178, EN60950-1
VDE: VDE0160, VDE0805 Teil1
SEMI standard
SEMI F47-0706 (200 VAC input)
Weight
1,600 g max.
*1. Do not use an inverter output for the Power Supply. Inverters with an output frequency of 50/60 Hz are available, but the rise in the internal
temperature of the Power Supply may result in ignition or burning.
*2. Refer to Engineering Data on page 8 for details.
*3. If the output voltage adjuster (V. ADJ) is turned, the voltage will increase by more than 10% of the voltage adjustment range. When adjusting
the output voltage, confirm the actual output voltage from the Power Supply and be sure that the load is not damaged. If the output voltage
exceeds 28.8 V, all branch outputs will be cut off.
*4. Rated input and output conditions: Rated input voltage, rated frequency, rated output voltage, rated total output current, and maximum cutoff
output current.
*5. 100% load conditions: Rated output voltage, rated total output current, and maximum cutoff output current.
3
S8AS
S8AS-48008@
Item
Model
Efficiency (Typ.)
Voltage range *1
100 to 240 VAC (85 to 264 VAC)
Frequency *1
50/60 Hz (47 to 63 Hz)
Current
Input
conditions
100-V input
7.4 A max.
200-V input
3.9 A max.
Power factor
S8AS-48008N
S8AS-48008R
0.95 min.
Harmonic current
Leakage
current
Output
conditions
S8AS-48008
80% min.
EN61000-3-2
100-V input
0.5 mA max.
200-V input
1.0 mA max.
Inrush current 100-V input
*2
200-V input
25 A max. (for a cold start at 25°C)
Number of branches
8
Maximum cutoff output current (per branch)
3.8 A
Total output current
20 A
Allowable voltage range *3
±10% (with V.ADJ)
Ripple noise voltage
2.0%[P-P] max. (for rated input and output voltage) *4
Output leakage current
10 mA max.
Input fluctuation
0.5% max. (Input: 85 to 264 VAC, 100% load) *5
Load fluctuation (rated input voltage)
4.0% max. (rated input, 0% to 100% load) *5
50 A max. (for a cold start at 25°C)
Temperature fluctuation
0.05%/°C max.
Startup time *2
3,000 ms max. (for rated input and output voltage) *4
Output hold time *2
20 ms min. (for rated input and output voltage) *4
Abnormal voltage tripping
28.8 V (Cannot be changed.)
Abnormal current tripping *2
Setting range: 0.5 to 3.8 A
(in 0.1-A increments)
Abnormal total current tripping
Branch outputs are cut off when the total output current is more than 27 A for 1 s, 25 A for 2 s, or 22.5 A for 5 s.
Tripping alarm output
Photoswitch output
30 VDC max. and 50 mA max., Leakage current: 0.1 mA max., Residual voltage: 2 V max.
Undervoltage
detection
functions
Undervoltage detection
Setting range: 18.0 to 26.4 V
(in 0.1-V increments)
Undervoltage detection output
Photoswitch output
30 VDC max. and 50 mA max., Leakage current: 0.1 mA max., Residual voltage: 2 V max.
Maintenance
forecast
monitor
function
Maintenance forecast monitor
Setting range: 0.0 to 5.0 yr
(in 0.5-yr increments)
Maintenance forecast monitor output
Photoswitch output
30 VDC max. and 50 mA max., Leakage current: 0.1 mA max., Residual voltage: 2 V max.
Overtemperature
detection
function
Over-temperature
Setting range: 25 to 90°C
(in 1°C increments)
Over-temperature output
Photoswitch output
30 VDC max. and 50 mA max., Leakage current: 0.1 mA max., Residual voltage: 2 V max.
Output voltage display
Display range:17.0 to 30.0 V
Display accuracy: 2% rdg ±1 digit max.
Output current display
Branch output display range: 0.0 to 4.0 A
Peak output current display range: 0.0 to 20.0 A
Total current display range: 0.0 to 40.0 A
Display accuracy: 5% FS (4 A) ±1 digit max.
Tripping
functions
Display
functions
3.8 A (Cannot be changed.)
20.0 V (Cannot be changed.)
0.5 yr (Cannot be changed.)
90°C (Cannot be changed.)
Setting range: 0.5 to 3.8 A
(in 0.1-A increments)
Setting range: 18.0 to 26.4 V
(in 0.1-V increments)
Setting range: 0.0 to 5.0 yr
(in 0.5-yr increments)
Setting range: 25 to 90°C
(in 1°C increments)
Maintenance forecast monitor display Display range: FUL (Full)/HLF (Half)/0.0 to 5.0 yr
Functions
Temperature display
Display range: −20 to 100°C
Display accuracy: 2°C ±1 digit max.
The input can be enabled or disabled
for each branch output.
19.2 to 30 VDC, minimum signal width:
10 ms, tripping after input within 20 ms
+ the shutdown sequence set time
All branch outputs: Enabled
(Cannot be changed.)
19.2 to 30 VDC, minimum signal width:
10 ms, tripping after input within 20 ms
+ the shutdown sequence set time
The input can be enabled or disabled
for each branch output.
19.2 to 30 VDC, minimum signal width:
10 ms, tripping after input within 20 ms
+ the shutdown sequence set time
Startup sequence
Setting range: 0.0 to 99.9 s in 0.1-s
increments
Branch output 1: 0.0 s
(Cannot be changed.)
Branch output 2: 0.4 s
(Cannot be changed.)
Branch output 3: 0.8 s
(Cannot be changed.)
Branch output 4: 1.2 s
(Cannot be changed.)
Branch output 5: 1.6 s
(Cannot be changed.)
Branch output 6: 2.0 s
(Cannot be changed.)
Branch output 7: 2.4 s
(Cannot be changed.)
Branch output 8: 2.8 s
(Cannot be changed.)
Setting range: 0.0 to 99.9 s in 0.1-s
increments
Shutdown sequence
Setting range: 0.0 to 99.9 s in 0.1-s
increments
All branch outputs: 0.0 s
(Cannot be changed.)
Setting range: 0.0 to 99.9 s in 0.1-s
increments
Communications
Not supported
Sampling period
1 ms
Parallel connection
Not supported
Series connection
Not supported
External Tripping Input
Supported (RS-485)
Note: Refer to the next page for information on *1 to *5.
4
S8AS
Item
Others
Model
S8AS-48008
S8AS-48008N
S8AS-48008R
Ambient operating temperature
Refer to the derating curve (no icing or condensation). *2
Storage temperature
−25 to 65°C
Ambient operating humidity
25% to 85% (storage: 25% to 90%)
Withstand voltage
3.0 kVAC for 1 min between all input terminals collectively and all branch output, all I/O signal, and all communications
terminals collectively (Detection current: 20 mA)
2.0 kVAC for 1 min between all inputs and protective earth (Detection current: 20 mA)
1.0 kVAC for 1 min between protective earth and all branch output, all I/O signal, and all communications terminals
collectively (Detection current: 30 mA)
500 VAC for 1 min between all branch output and all I/O signal/communications terminals collectively
(Detection current: 20 mA)
500 VAC for 1 min between all I/O signal terminals collectively and communications terminals collectively
(Detection current: 20 mA)
500 VAC for 1 min between all I/O signal terminals collectively and all output signal terminals collectively
(detection current: 20 mA)
Insulation resistance
100 MΩ min. at 500 VDC between the protective earth terminal or all input terminals collectively and all branch output, all I/
O signal, and all communications terminals collectively
Vibration resistance
No abnormality after 10 to 55 Hz at 0.375-mm single amplitude for 2 h each in 3 directions.
Shock resistance
No abnormality after 150 m/s2 3 times each in 6 directions.
Output indicator
Provided (Color: green)
Conducted EMI
Conforms to EN 61204-3 Class A and FCC Class A.
Radiated EMI
Conforms to EN 61204-3 Class A.
Safety standards (pending)
cULus: UL508 (Listing. Class2: Per UL1310), CSA C22.2 No.107.1 (Class2: Per CSA C22.2 No.223)
cURus: UL60950-1, CSA C22.2 No.60950-1
EN: EN50178, EN60950-1
VDE: VDE0160, VDE0805 Teil1
SEMI standard
SEMI F47-0706 (200 VAC input)
Weight
2,400 g max.
*1. Do not use an inverter output for the Power Supply. Inverters with an output frequency of 50/60 Hz are available, but the rise in the internal
temperature of the Power Supply may result in ignition or burning.
*2. Refer to Engineering Data on page 8 for details.
*3. If the output voltage adjuster (V. ADJ) is turned, the voltage will increase by more than 10% of the voltage adjustment range. When adjusting
the output voltage, confirm the actual output voltage from the Power Supply and be sure that the load is not damaged. If the output voltage
exceeds 28.8 V, all branch outputs will be cut off.
*4. Rated input and output conditions: Rated input voltage, rated frequency, rated output voltage, rated total output current, and maximum cutoff
output current.
*5. 100% load conditions: Rated output voltage, rated total output current, and maximum cutoff output current.
5
S8AS
Connections
Block Diagrams
S8AS-24006@
(S8AS-24006R only)
RS-485
A (−)
B (+)
Communications
circuit
TRP
Voltage Temperature Switches
detection detection
LOW
Display
circuit
LFE
Processing circuit
(main processing)
TMP
COM
Communications between
processing circuits (RS-232C)
TRG+
TRG−
Branch output 6
Branch output 5
Branch output 4
Rectification
and smoothing
Branch output 3
Branch output 2
Branch output 1
Current
limiting
circuit
Current-
Processing circuit
(replacement time)
SCREW (M3.5)
AC (L)
Fuse:
8A
INPUT
AC (N)
Cutoff detection
circuit resistor
Thermal
fuse
Noise
filter
Rectifi- Inrush Harmonic current Smoothing
cation current suppression circuit
limit
(Power factor improvement)
Current
fuse
Cutoff circuit
+V
DC OUTPUT
Currentdetection
resistor
−V
−V
Rectification
and smoothing
SCREW (M4)
Drive control
circuit
Power supply
detection
Voltage-ON
detection
Photocoupler
(S8AS-48008R only)
S8AS-48008@
RS-485
Communications
circuit
A (−)
B (+)
TRP
LOW
Display
Voltage Temperature
detection detection Switches circuit
LFE
Processing circuit
(main processing)
TMP
Communications between
processing circuits (RS-232C)
COM
TRG+
TRG−
Branch output 8
Branch output 7
Branch output 6
Branch output 5
Branch output 4
Branch output 3
Branch output 2
Branch output 1
SCREW (M3.5)
INPUT
AC (N)
Current
limiting
circuit
Cutoff circuit
Current-
Cutoff detection
circuit resistor
AC (L)
Fuse:
12 A
Noise
filter
Rectifi- Inrush Harmonic current Smoothcation current suppression circuit ing
limit
(Power factor
improvement)
Rectification
and smoothing
Thermal
fuse
Currentdetection
resistor
Current fuse
+V
DC OUTPUT
−V
−V
SCREW (M4)
Voltage-ON
detection
Control
circuits
Drive
circuit
Processing
circuit
Voltage detection
Current detection
Current-ON detection
Auxiliary power Rectification
supply circuit and smoothing
6
S8AS
Constructions and Nomenclature
Nomenclature
S8AS-24006@
No.
1
9
2
AC Input Terminals (L and N)
2
Protective Earth (PE) Terminal (
10
11
3
Positive Branch Output Terminals (+)
Screwless terminals with 2-pole
terminals for each branch output.
12
4
Negative Branch Output Terminals (−)
Screwless terminals with 2-pole
terminals for each branch output
and screw terminal shared by the
negative branch output terminals.
S8AS-24006
A(-)
N
1
+1
DC ON
5
2
3
4
5
6
+V
-V
-V
+2
+3
+4
+5
3
+6
-1
-2
-3
-4
-5
-6
7
4
S8AS-48008@
1
9
2
13
5
S8AS-48008
POWER SUPPLY
L
Tripping Alarm
(A)
Output (TRP) *3
Turns ON to indicate when an
abnormal voltage or current was
detected and the output was cut
off. (The photoswitch output will
turn OFF.)
Undervoltage
(B) Detection Output
(LOW)
Turns ON to indicate when the 24VDC output voltage of the S8AS falls
below the threshold due to decrease
in input voltage or other factors. (The
photoswitch output will turn OFF.)
Maintenance
(C) Forecast Monitor
Output (LFE)
Turns OFF to indicate when the
number of years to the set
replacement time has been
reached. (The photoswitch output
will turn OFF.)
V.ADJ
TRP LOW LFE TMP COM + TRG -
6
V A Yrs °C s
1 2 3 4 5 6
INPUT
50/60Hz AC100-240V 3.8A
) Connects to the ground wire. *2
8
B(+)
RS485
Class2
OUTPUT
DC 24V 3.8A
Functions
Connects the input power supply
(100 to 240 VAC, 50/60 Hz)
(commercial power supply). *1
1
POWER SUPPLY
L
Name
13
A(-)
N
8
B(+)
RS485
INPUT
1 2 3 4 5 6 7 8
V A Yrs °C s
50/60Hz AC100-240V 7.4A
1
Class2
OUTPUT
DC 24V 3.8A
DC ON
2
3
4
5
6
7
8
10
11
(D)
12
+V
+1
+2
+3
+4
+5
+6
-1
-2
-3
-4
-5
-6
+7
+8
Over-temperature
Output (TMP)
Negative Common
(E) Terminal (COM)
(no polarity)
-V
-V
I/O
Signal
Terminals
3
Turns ON to indicate that the
temperature exceeded the overtemperature output threshold. (The
photoswitch output will turn OFF.)
Negative common shared by the
four alarm outputs ((A) to (D)) above.
Positive External
Tripping Input (TRG+) Can be used to send an input
signal from an external device to
Negative External
cut off a branch output. *4
(G)
Tripping Input (TRG−)
V.ADJ
(F)
TRP LOW LFE TMP COM + TRG -
5
6 7
5. I/O Signal Terminal Internal
Circuit Configuration
Photoswitch
-7
-8
4
Output Indicator (DC ON (Green))
Indicates whether there is output
voltage supplied.
7
Output Voltage Adjuster (V.ADJ)
Adjusts the output voltage.
8
Seven-segment Display (Red)
Displays measured values or set values.
9
Branch Output Indicators (Orange)
Light or flash when there is a
display related to branch output
(outputs 1 to 6 and 8). *5
6
10 Unit Indicators (Orange)
Light or flash when there is a unit (e.g.,
V, A, Yrs, °C, s) related to the value
shown on the 7-segment display.
11 Status indicators (Red/Green)
Indicate the status of the branch outputs:
Cutoff: red, Connected: green. *6
TRP LOW LFE TMP COM + TRG -
12
Reset (RST) Key
Used to clear the error status when
a branch output was cut off by an
error or there was an alarm output.
Enter (ENT) Key
Used to switch the display item,
enter or execute settings, etc.
Operation
Keys
Up (SEL) Key
(A) (B) (C) (D) (E) (F) (G)
Down (CH) Key
13
Communications Terminals (A (−),
B (+))
(Only for Models That Support
Communications)
Used to change the display item
forward or to increase a set value.
Used to switch the branch output
or to decrease a set value.The
branch output number that is set
remains the same in other modes.
Used to connect to the RS-485
communications line.
Note: The noise value depends on the wiring method and other factors. Insert
a clamp filter (recommended: E04SR301334 manufactured by SEIWA)
on the communications wiring as a countermeasure against noise.
*1. The fuse is located on the (L) side.
*2. This is the protective earth terminal specified in the safety
standards. Always ground this terminal.
*3. In Test Mode, the tripping alarm output (TRP) will operate even if
one or more of the branch outputs is set to OFF. This error output,
however, will not be held when operation moves to another
operating mode.
*4. Wire the polarity of the external tripping input correctly. After
completing wiring, confirm that the input operates correctly.
*5. The branch output indicators are OFF when current is not used.
*6. 6.Information on procedures for detailed displays is given in
Status Indicators on page 16.
7
S8AS
Engineering Data
Load rate (%)
Total output current
Derating Curve
Extended Detection
Time
(ms)
120
Setting
range
100
Tripping region
Currentlimiting by
internal
circuits
1
1,000
80
60
60
40
20
3.8
0.5
20
11
16
19
Branch output (A)
0
−20 −10
0
10
20
30
40
50
60
70 80
Ambient temperature (°C)
Note: 1. Internal parts may occasionally be deteriorated or
damaged. Do not use the S8AS in areas outside the
derating curve (i.e., in the area shown by shading A in the
above graph).
2. Use forced cooling if necessary to satisfy the derating curve.
3. For 480-W models, reduce the load to 80% or less for longterm use at an input voltage of 95 VAC or less.
Abnormal Current Tripping
Standard Detection
Tripping Performance
The S8AS detects the current of branch outputs as digital values and
numeric processing is performed to execute cutoff operations.
Refer to Abnormal Current Tripping for the tripping performance. The
following cutoff functions are also provided.
Judgment Type Selection
Standard, instantaneous, or extended can be set as the method for
detecting the tripping current. With the S8AS-24006N/48008N, only
the extended detection is supported. Refer to the S8AS User's
Manual (Cat. No. Z269) for the setting method.
Current Limit
Time
(ms)
This function is provided to limit excessive short currents, such as
those that can flow for equipment short faults.
Setting
range
Currentlimiting by
internal
circuits
Tripping region
100
Startup Delay
This function is provided to disable cutoff operations for 40 ms after
the branch outputs turn ON so that cutoff operations will not occur for
large inrush currents.
Safety Circuits
60
Temperature fuses and current fuses are provided for each branch
output to ensure safety even in the unusual event of an internal
failure.
20
0.5
3.8
11
16
19
Branch output (A)
Mounting
Instantaneous Detection
Standard Mounting
Face-up Mounting
Time
(ms)
S8AS-24006
POWER SUPPLY
A(-)
L
N
1 2 3 4 5 6
INPUT
Currentlimiting by
internal
circuits
DC ON
20
19
Branch output (A)
2
V A Yrs °C s
3
4
5
6
+V
Class2
OUTPUT
DC 24V 3.8A
-V
-V
+1
+2
+3
+4
+5
+6
-1
-2
-3
-4
-5
-6
V.ADJ
TRP LOW LFE TMP COM + TRG -
3.8
1
50/60Hz AC100-240V 3.8A
Tripping region
0.5
B(+)
RS485
Setting
range
Note: 1. The above illustration shows a 240-W model.
2. Poor heat dissipation resulting from improper installation
conditions may occasionally deteriorate or damage internal
parts and also cause the maintenance forecast monitor
function to not operate properly. Do not use any mounting
orientation other than a standard one.
Inrush Current, Startup Time, Output Hold Time
Input ON
Input OFF
AC input
voltage
Inrush current on input application
AC input
current
96.5%
90%
Output
voltage
Startup time (3,000 ms max.)
Hold time (20 ms min.)
8
S8AS
Functions
Functions
Alarm
Alarm output
Output status
Alarm display
Abnormal voltage tripping
TRP output: OFF (normally ON)
All branch outputs cut off.
A10
Abnormal current tripping
TRP output: OFF (normally ON)
Relevant branch output cut off.
A11
Abnormal total current tripping (240-W models only)
TRP output: OFF (normally ON)
All branch outputs cut off.
A12
Undervoltage detection
LOW output: OFF (normally ON)
ON
A21
Maintenance forecast monitor
LFE output: OFF (normally ON)
ON
A23
Overheating alarm
LFE output: OFF (normally ON)
ON
A23/HOT
Over-temperature
TMP output: OFF (normally ON)
ON
A30
Tripping Functions
Function
Operation
Abnormal
voltage tripping
Refer to Chart 1.
*1, *2, *3
The output voltage is monitored and all branch outputs are cut off if the detection voltage is reached. Notification of the status
is provided using the alarm display and the tripping alarm output (TRP).
The alarm display will alternate between the voltage and the alarm code (A10).
Detection voltage: 28.8 V (fixed)
The output current is monitored and the branch output that is abnormal is cut off if the preset current is reached.
Notification of the status is provided using the alarm display and the tripping alarm output (TRP).
The alarm display will alternate between the current and the alarm code (A11).
Setting range: 0.5 to 3.8 A (in 0.1-A increments). The S8AS-24006N and S8AS-48008N are set to 3.8 A. (Cannot be changed.)
Abnormal
One of the following three abnormal current tripping types can be set. With the S8AS-24006N/48008N, only the standard
detection is supported.
current tripping
Refer to Chart 2. Standard Detection: Tripping within 100 ms. (Abnormal current will be detected and the output will be cut off within 20 ms if
*1, *2
current continuously exceeds the set value for more than 80 ms.)
Instantaneous Detection: Tripping within 20 ms. (Abnormal current will be detected and the output will be cut off within 10 ms
if current continuously exceeds the set value for more than 10 ms.)
Extended Detection: Tripping within 1,000 ms. (Abnormal current will be detected and the output will be cut off within 20 ms
if current continuously exceeds the set value for more than 980 ms.)
Abnormal total
current tripping
*1, *2
Using the abnormal total current tripping function, the S8AS monitors the total output current and when the total output current
exceeds the set value, all branch outputs are cut off. Notification of the status is provided using the alarm display and the
tripping alarm output (TRP). The error code A12 will be shown on the display. There are a number of conditions for the tripping
current and time. If even one of these conditions is detected, the abnormal total current tripping function will be activated.
240 W: Branch outputs are cut off when the total output current is more than 17 A for 2 s, 15 A for 5 s, 13 A for 10 s, or 12 A
for 20 s.
480 W: Branch outputs are cut off when the total output current is more than 27 A for 1 s, 25 A for 2 s, or 22.5 A for 5 s.
The output can be cut off by inputting a voltage to the external tripping input (TRG terminal). If a shutdown sequence has been
set, outputs will be cut off according to the shutdown sequence.
Each branch output can be enabled or disabled individually. On the S8AS-24006N/S8AS-48008N, all branch outputs are
enabled. (Cannot be changed.)
External tripping External input signal width: 10 ms min.
input
Input signal levels
*1
High level: 19.2 to 30 VDC
Low level: 0 to 2.5 VDC
Tripping can also be performed by using communications (S8AS-24006R/S8AS-48008R only).
Refer to the S8AS User's Manual (Cat. No. Z269) for information on tripping using communications.
Note: Three abnormal current tripping types with different tripping current characteristics are supported: standard detection, instantaneous
detection, and extended detection. Select the required tripping type.
*1. Outputs are cut off using semiconductor relays and electrical insulation is not provided.
*2. With the default settings, the alarm display and alarm output can be cleared using one of the following methods.
• Clear using the reset operation.
• Clear by turning the supply power OFF and ON again.
*3. The voltage detection is performed on the voltage after AC/DC conversion in the internal circuits. The displayed voltage will be somewhat
different from the value at the output terminals of the power source due to internal voltage drop. To confirm correct output voltages, measure
the voltages at the branch output terminals.
9
S8AS
Chart 1: Operation Timing
Chart 2: Operation Timing
(Fixed)
28.8 V (Abnormal voltage tripping)
24 V (Rated)
(Settable)
3.8 A (Abnormal current tripping)
3.0 A (Normal current)
20 V (undervoltage detection)
(Settable)
0
100 ms
0
t
A21
Alarm display
t
A10
Tripping alarm output *
Undervoltage detection output *
20 ms
Tripping alarm output *
A11
Alarm display
Within 20 ms for instantaneous detection
and 100 ms for standard detection, or
within 1000 ms for extended
detection (depends on tripping type).
* The tripping alarm output is a photoswitch output.
The output is normally ON and turns OFF when
an alarm is detected.
Reset
* The undervoltage detection output and tripping alarm
output are both photoswitch outputs. The output is
normally ON and turns OFF when an alarm is detected.
Alarm Functions
Function
Operation
Undervoltage
detection output
(Refer to Chart 1.)
*1, *2
The voltage is monitored and notification is provided using the alarm display and output (LOW) if the preset voltage is
exceeded for more than 80 ms. The alarm display will alternate between the voltage and the alarm code (A21).
Undervoltage detection threshold setting range: 18.0 to 26.4 V in 0.1-V increments.The S8AS-24006N and S8AS-48008N are
set to 20.0 V. (Cannot be changed.)
Maintenance
forecast monitor
*1
The time that the power is ON is calculated as the S8AS run time and notification is provided using the alarm display and
maintenance forecast monitor output (LFE) if the preset time is reached. The alarm display will alternate between the run time
and the alarm code (A23).
Display range: FUL (Full), HLF (Half), or 0.0 to 5.0 years.
The internal temperature of the S8AS is monitored using a built-in temperature sensor and notification is provided using the
alarm display and over-temperature output (TMP) if the preset temperature is exceeded for more than 1 s. The alarm display
will alternate between the temperature and the alarm code (A30). The over-temperature output is convenient for control
Over-temperature
operations, such as operating a cooling fan to suppress temperature increased in the control panel.
(Refer to Chart 3.)
Note: The alarm display and over-temperature output are automatically cleared if the temperature falls below the set
*1
temperature.
Display range: −20 to 100°C in 1°C increments.
Temperature setting range: 25 to 90°C in 1°C increments.
Note: 1. Branch outputs are not cut off for the alarm functions
2. The voltage detection is performed on the voltage after AC/DC conversion in the interval circuits. The displayed voltage will be somewhat
different from the value at the output terminals of the power source due to internal voltage drop. To confirm correct output voltages,
measure the voltages at the branch output terminals.
Chart 3: Operation Timing
Temperature
50°C
(Settable)
0
Alarm display
t
A30
A30
A30
Temperature *
* The alarm display and over-temperature output are automatically
cleared (with hysteresis). The over-temperature output is a
photoswitch output. It is normally ON and turns OFF when an
alarm is detected.
10
S8AS
Maintenance Forecast Monitor Function
Indication and Output
Example: Display When the Time Remaining to the
Maintenance Time Is Less Than 0.5 yr
When the Product is purchased, “ful” will be displayed. As the
electrolytic capacitors deteriorate, the display will change to “hlf”
(Refer to Maintenance Forecast Monitor Function). “ful” will be
displayed for the maintenance forecast display for approximately one
month after the Power Supply is first turned ON. The accumulated
value will then be displayed depending on the ambient conditions.
(However, the “hlf” display may not appear, depending on the
application environment and the set value for maintenance forecast.)
If the maintenance forecast setting L (which can be set to 0.0 to 5.0
years in 0.5-year increments) is set to a value larger than two years,
the display automatically changes to a value (L - 0.5) after the
remaining time to maintenance is reduced to the set number of years,
and an alarm (A23) and the remaining time will be displayed
alternately.
If the setting is less than 2.0 years, the display changes to a value
(1.5) after the remaining time becomes less than two years, and after
the remaining time becomes less than the set time, an alarm (A23)
and the remaining time (L - 0.5) will be displayed alternately.
If the alarm (A23) and a numeric value are displayed alternately, the
transistor (maintenance forecast output terminal (Yrs)) will turn OFF
to indicate the need for maintenance., i.e., there will be no continuity
at the maintenance forecast output terminals.
(The LEF output will turn OFF when the maintenance time has been
reached.)
1 2 3 4 5 6
V A Yrs °C s
1 2 3 4 5 6
V A Yrs °C s
Note: 1. The time remaining to maintenance is based on continuous
operation, not including the time when the power supply is
turned OFF.
2. “ful” will be displayed until approximately one month of
time has passed to enable estimating the speed of
deterioration. The output will remain ON (i.e., there will be
continuity at the maintenance forecast output terminal
(Yrs)).
3. For details on the display, refer to Relationship between
Displayed Values and Output of Set Values.
Maintenance Forecast Monitor Function
The Power Supply is equipped with electrolytic capacitors.
The electrolyte inside the electrolytic capacitors penetrates the
sealing rubber and evaporates as time passes after it is
manufactured. This causes deterioration of characteristics, such as
decreasing the capacitance.
Due to this deterioration of the characteristics of the electrolytic
capacitor, the Power Supply decreases its performance as time
passes.
The maintenance forecast monitor function shows an approximate
period left for maintenance of the Power Supply due to deterioration
of electrolytic capacitors. When the period left for maintenance that
the power supply forecasts reaches the set value, an alarm is
indicated and an output signal is triggered. Use this function to know
the approximate replacement timing of the Power Supply.
Note: The maintenance forecast monitor function indicates an
approximate period left for maintenance, based on
deterioration of the electrolytic capacitors. It does not predict
failures resulting from other causes.
Relationship between Displayed Values and Output of Set Values
L: Maintenance forecast set value
0.0 to 5.0, 0.5 steps
When L is set to between 2.5 and 5 years.
Initial capacity
(L − 0.5)
"1.0" is displayed on the main display for the duration
that the maintenance forecast up to replacement
satisfies the condition 1.0 ≤ T < 1.5.
Capacity at
replacement
time
Electrolytic capacitor capacity
5.0
Main display
2.5
2.0
1.5
1.0
0.5
0
T: Maintenance time until replacement
L = 2.5
Maintenance forecast
monitor output
L = 0.5
1 2 3 4 5 6
V A Yrs °C s
1 2 3 4 5 6
V A Yrs °C s
1 2 3 4 5 6
V A Yrs °C s
1 2 3 4 5 6
V A Yrs °C s
The numeric value
decreases with time.
11
S8AS
Principle of Operation
Difference between Expected Life and Replacement Time
The deterioration speed of the electrolytic capacitors varies
considerably with the ambient temperature. (Generally the speed
follows the Arrhenius Law, i.e., for every 10°C increase in the
temperature, the rate of degradation doubles.) The S8AS monitors
the temperature inside the Power Supply, and calculates the amount
of deterioration according to the operating hours and internal
temperature.
OMRON calculates the expected life based on the following
conditions.
1. Rated input voltage
2. Load rate: 50%
3. Ambient temperature: 40°C
4. Standard Mounting
Based on this amount of deterioration, the Power Supply will provide
an alarm indication and output when the period left for maintenance
reaches the set value.
Note: 1. Due to degradation of internal electronic parts, replace the
Power Supply approximately 15 years after purchase even
if the maintenance forecast monitor indication and output do
not appear.
2. The maintenance forecast is accelerated or decelerated
according to operating conditions. Periodically check the
display.
3. Acceleration or deceleration of the maintenance forecast
may cause the output to repeatedly go ON and OFF.
4. The accuracy of the maintenance forecast function may be
adversely affected by applications in which the AC input is
frequently turned ON and OFF.
Note: The expected life is calculated by performing a temperature rise
test using an aluminum electrolytic capacitor, and therefore is
not a guaranteed value.
The expected life span of the S8AS is 10 years.
The maintenance forecast is the service life (the Power Supply's
internal temperature is monitored at all times) of the internal
electrolytic capacitors in actual operating conditions, and depends on
the customer's operating conditions. The maximum period of the
maintenance forecast is taken as 15 years.
Other Functions
Function
Operation
Startup sequence
(Refer to Chart 5.)
The connection timing for branch outputs 1 to 6 and 8 can be set individually to offset the connection timing to the load
devices. Creating time delays between starting loads enables safer load operation. It also reduces total inrush current so
that power supply capacity can be optimized.
Setting range:
0.0 to 99.9 s in 0.1-s increments.
For the S8AS-24006N and S8AS-48008N, the settings are 0.0 s for branch output 1, 0.4 s for branch
output 2, 0.8 s for branch output 3, 1.2 s for branch output 4, 1.6 s for branch output 5, 2.0 for branch
output 6, 2.4 s for branch output 7, and 2.8 s for branch output 8. (Cannot be changed.) *
Shutdown
sequence
(Refer to Chart 6.)
The cutoff timing for branch outputs 1 to 6 and 8 can be set individually to offset the cutoff timing of load devices for the
external tipping input or to enable an emergency stop.
Setting range: 0.0 to 99.0 s in 0.1-s increments. For the S8AS-24006N and S8AS-48008N, all branch outputs have a setting
of 0.0 s. (Cannot be changed.) *
Startup Delay
A delay function is provided so that the abnormal current tripping function
or overcurrent alarm function will not be triggered by large initial inrush
currents, e.g., for capacitive loads or lamp loads. The abnormal current
tripping function will function once the set time has elapsed.
(Note: The delay is 40 ms and cannot be changed.)
Current
Alarm function disabled
for large inrush
currents at startup.
0
t
40 ms: Delay
* The sequencing functions are designed for the six branch outputs of one S8AS. There is no synchronization processing between S8AS Power
Supplies when more than one S8AS is used. Sequencing functions for branch outputs 7 and 8 are available only with the S8AS-48008N.
12
S8AS
Chart 5: Operation Timing
Chart 6: Operation Timing
Power supply voltage
External tripping input
Branch output 1 voltage
Branch output 1 voltage
Startup sequence time
Shutdown sequence time
Branch output 2 voltage
Branch output 2 voltage
Startup sequence time
Shutdown sequence time
Branch output 3 voltage
Branch output 3 voltage
Startup sequence time
Branch output 6 or
branch output 8 voltage
Shutdown sequence time
Branch output 6 or
branch output 8 voltage
Startup sequence time
Self-diagnostics
(0.5 s min.)
Note: For the S8AS-24006N and S8AS-48008N, the settings are
0.0 s for branch output 1, 0.4 s for branch output 2, 0.8 s for
branch output 3, 1.2 s for branch output 4, 1.6 s for branch
output 5, 2.0 for branch output 6, 2.4 s for branch output 7, and
2.8 s for branch output 8. (Cannot be changed.)
(Branch outputs 7 and 8 are available only with the S8AS48008N.)
Shutdown sequence time
20 ms max.
Note: 1. Cut off simultaneously for tripping for abnormal voltages
(28.8 V or higher).
2. For the S8AS-24006N and S8AS-48008N, all branch
outputs have a setting of 0.0 s. (Cannot be changed.)
13
S8AS
Key Operations and Displays in Each Mode
Power ON
• First startup after purchase.
• When power was turned
OFF in any mode except
Test Mode.
When power was turned
OFF in Test Mode
*3
Run Mode
Setting Mode
Test Mode
*2
Output voltage
display
Current tripping
threshold
Value Setting
Individual branch outputs
*1, *2
No key operation for more than 3 s.
Current tripping
type
Total Current
Display
*1
Output Current
Display
Undervoltage
detection threshold
Clearing selected
peak output current.
Peak Output
Current Display
Maintenance Forecast
Monitor Output Display
Value Setting
Cut off all branch outputs
(Shutdown Sequence)
No key operation for more than 3 s.
*1
Over-temperature
output threshold
Cut off
Connected
Selection of Standard,
Instantaneous, or
Extended Detection
No key operation for more than 3 s.
Execute
Value Setting
No key operation for more than 3 s.
or no key operation for
more than 3 s.
Startup Sequence
Time Setting *2
Time Setting
Connect all branch outputs
(Startup Sequence)
No key operation for more than 3 s.
Temperature
Display
Shutdown Sequence
Time Setting *2
Execute
Time Setting
No key operation for more than 3 s.
External Tripping
Input Setting *2
Enable/Disable
Setting
No key operation for more than 3 s.
Selection of Tripping
Trigger Type: EGE/LVL
External Tripping
Trigger Type
No key operation for more than 3 s.
Communications Settings
(Models with
communications only)
Settings
No key operation for more than 3 s.
Press for 3 s.
Select reset
method
Selection of
Method
No key operation for more than 3 s.
Mode Selection Menu
Press for 3 s.
Press for 3 s.
*3
Select Run Mode
Select Setting Mode
*3
Select Test Mode
Select Protection level
Press for 3 s.
Level Selection
*3
Initialize Parameters
Press for 3 s.
Yes, initialize.
*1. Branch outputs can be changed using the Down (
) Key. The changes to the branch outputs will be retained in other displays as well.
*2. Settings are displayed in order for branch outputs. Specific branch output settings have been omitted.
*3. Not displayed for the S8AS-24006N/48008N.
14
S8AS
Mode Descriptions
The S8AS supports a Run Mode, Setting Mode, and Test Mode.
Run Mode
Used for normal operation.
The measurements for the output voltage, output
current, replacement time, and internal
temperature can be read on the seven-segment
display.
Setting Mode * Used to set or change S8AS parameters.
Mode Selection Menu
(1) Run Mode (RUN)
(1) In Run Mode, the current for each branch output, the total output
current, the output voltage, the replacement time, the internal
temperature, and other values can be displayed.
Use this mode for operation once initial settings and system
adjustments have been completed.
(2) Setting Mode (SET)
(2) Setting Mode is used to set parameters.
Used to test operation for devices connected to
Test Mode
the S8AS.
Note: Refer to the S8AS User's Manual (Cat. No. Z269) for details.
* The S8AS-24006N and S8AS-48008N do not have a Setting Mode.
(3) Test Mode (TST)
(3) Test Mode enables forcing branch outputs ON and OFF.
Connections and cutoffs can be manipulated for all outputs for each
branch output. By default, all outputs will be ON (connected).
Use this mode to set unused branch outputs to OFF (not connected).
Initial Setting Procedure after Purchase
The following diagram illustrates mode transitions for the S8AS.
When the S8AS is turned ON for the first time, it will enter Setting
Mode. After changing to Setting Mode, set the initial setting for each
parameter, and then switch to Test Mode or Run Mode.
• When newly
purchased. Power ON
• S8AS was not in
Test Mode when
power went OFF.
S8AS was in
Test Mode
when power
went OFF.
*3
Mode Selection Menu
Run Mode
(4) Protection Level
(PRT)
(4) Protection Level can be used to set restrictions for setting
parameters.
Three levels, levels 0, 1, and 2, are available. The default is level 1.
Refer to the User's Manual for the parameters that are protected in
each level.
(5) Initialize Parameters
(INI)
Select Run Mode run (RUN)
(5) Parameters can be initialized to return all parameters to their default
settings.
The Initialize Parameters is not displayed in the default protection
level (level 1).
Press for 3 s.
*1
Select Setting Mode set (SET)
((1) Switches to
RUN Mode display.)
Setting Mode
Select Test Mode tst (TST)
Test Mode
Press for 3 s.
*1
Select Protection Level prt (PRT)
Press for 3 s.
*1, *2
Initialize Parameters ini (INI)
Go to Setting Mode to change any of the default parameter settings.
Operation may be restricted by the protection level, preventing
changes to some parameters. If necessary, change the protection
level.
Refer to the User's Manual for details on parameters and restrictions
for the protection levels.
*1. Not displayed for the S8AS-24006N/48008N.
*2. Initialize Parameters is displayed only in protection level 0.
*3. If the Mode Selection Menu is entered in Test Mode and then the power is
turned OFF before entering another operating mode, the S8AS will start in
Test Mode the next time it is started.
15
S8AS
Run Mode
Status Indicators
Run Mode is used for normal operation. When the power is turned ON
and the mode was Run Mode or Setting Mode the last time the input
power was turned OFF, the S8AS will start in Run Mode and
connecting the branch outputs will be started. Monitoring of voltages,
currents, replacement time, and temperature can be confirmed using
the Up Key and Down Key (
/
).
The status indicators light according to the branch output status as
described below.
(1) Output Voltage
1 2 3 4 5 6
V A Yrs °C s
(1) When Run Mode is entered, the parameter
that was displayed the last time Run Mode
was used will be displayed.
The voltage output display is shown at the
left as an example.
Lit green
Normal connection status
Flashing
green
Connection standby status during the startup
sequence
Lit red
Cutoff status for an abnormality
Flashing red
Cutoff status for an internal abnormality
Not lit
Forced cutoff or operation stopped
S8AS-24006
POWER SUPPLY
A(-)
B(+)
RS485
(2) Total Output
Current
1 2 3 4 5 6
L
(2) The total current for all outputs is displayed.
N
V A Yrs °C s
(3) Present Output
Current for
Branch Output 1
*1
(Select the branch output with the
V A Yrs °C s
Down (CH) Key.))
(4) Peak Current for
Branch Output 2
1 2 3 4 5 6
V A Yrs °C s
Flashing
(Select the branch output with the
Down (CH) Key.))
(5) Replacement
Time
(3) The output current of the last branch output
that was set will be displayed regardless of
the operating mode.
The current output of the branch output 1 is
shown at the left.
The current output of the branch output 2 is
shown by pressing the Down (CH) Key.
*The branch output number set with the Down
(CH) Key is stored in memory even when the
operating mode or parameters are changed.
The branch output displayed when Test Mode is
entered will not necessarily be branch output 1.
(4) Press the Up (SEL) Key to display the peak
current for the branch output displayed in step 2
(e.g., branch output 2). The “A” unit indicator will
flash while the peak current is being displayed.
The peak current can be cleared by performing
the following procedure while the peak current is
being displayed.
1. Press the ENT Key.
2. Change the “NO” display to the “YES”
display using the Up (SEL) Key.
3. Press the ENT Key again.
2
V A Yrs °C s
3
4
5
6
-V
-V
+1
+2
+3
+4
+5
+6
-1
-2
-3
-4
-5
-6
Clearing the Peak Output Currents
The peak output currents can be cleared. Select the peak output
current to be cleared in Run Mode and then use the following
operation.
Peak Output Current
Display
1 2 3 4 5 6
Waiting display, 1 s
V A Yrs °C s
Clearing completed.
1 2 3 4 5 6
V A Yrs °C s
1 2 3 4 5 6
V A Yrs °C s
or 3 s with
no key
operations
(5) Displays the estimated number of years
until the replacement time.
V A Yrs °C s
V A Yrs °C s
After flashing for 3 s
Set value saved
(flashes for 3 s)
(6) Displays the internal temperature.
(6) Internal
Temperature
1 2 3 4 5 6
Status Indicators
+V
V.ADJ
TRP LOW LFE TMP COM + TRG -
1 2 3 4 5 6
1 2 3 4 5 6
1
Class2
OUTPUT
DC 24V 3.8A
DC ON
1 2 3 4 5 6
1 2 3 4 5 6
INPUT
50/60Hz AC100-240V 3.8A
1 2 3 4 5 6
V A Yrs °C s
((1) Switches to output voltage display.)
Press the Up (SEL) Key again to return to the
output voltage display and start the display
cycle again.
V A Yrs °C s
Indicator Status Notation
Lit
Flashing
Note: 1. The S8AS will start in Run Mode when power is turned ON
for the first time after shipping from the factory.
2. Settings cannot be changed in Run Mode. Use Setting
Mode to change settings. (The setting for the S8AS-24006N
and S8AS-48008N can not be changed.)
3. If a startup sequence has been set, connections will be
started according to the set delays.
4. When moving to Run Mode, the branch output ON/OFF
status from before entering Run Mode will be maintained.
After testing branch output operation in Test Mode, always
turn ON the required branch outputs before moving to Run
Mode.
5. The voltage detection function monitors the voltage at the
power input terminals. Measure the voltage at the branch
output terminals to confirm that the output voltage is correct.
16
S8AS
Setting Mode
Setting Mode is used to set S8AS parameters. Settings can be read or changed while operation continues.
The various parameters can be selected as shown below.
Abnormal Current Tripping Value
C-V
The current at which a branch output is cut off
Setting range: 0.5 to 3.8 A.
The branch output will be cut off if the value set here is
exceeded.
Communications Settings (*1, *5)
Unit No.
Unit number setting (0 to 31)
Branch output selection
UNO
Abnormal Current Tripping Type (*1)
Detection settings for currents to cut off branch outputs
Standard detection/instantaneous detection (*2)
C-T
Baud Rate
Baud rate setting
48: 4,800 bps, 96: 9,600 bps
Branch output selection
BPS
Undervoltage alarm
The undervoltage alarm will be output if the voltage drops
below this threshold value.
Setting range: 18.0 to 26.4 V
An alarm will be output if the value set here is exceeded.
V-U
Bit Length
Bit length setting (7 or 8)
LEN
Maintenance forecast monitor
The replacement time for the S8AS is calculated from the
operating time and internal temperature. The maintenance
forecast monitor output will operate when the replacement
time falls below the value set here.
Setting range: 0.0 to 5.0 years
LFE
Stop Bits
Stop bit setting (1 or 2)
BIT
Over-temperature Output
The temperature at which an signal is output.
Setting range: 25 to 90°C
An over-temperature signal will be output if the value set
here is exceeded.
TMP
Parity
Parity setting
non: None, evn: Even, odd: Odd
PTY
Startup Sequence (*1)
Enable/disable the startup sequence and set the time for
each branch output.
Time setting range: 0.0 to 99.9 s (*3)
UPS
Send Wait Time
Send wait time setting
0 to 999 ms
SWT
Branch output selection
Shutdown Sequence (*1)
Enable/disable the shutdown sequence and set the time
for each branch output.
Time setting range: 0.0 to 99.9 s (*4)
DWS
Reset method *1
RST
Branch output selection
Reset method setting
KEY: Clear errors using the Reset Key (RST)
ALL: Clear errors using the Reset Key (RST) or
by turning the power OFF and ON again.
External tripping (*1)
Enables (ON) or disables (OFF) the external
tripping input function.
TRG
Branch output selection
Tripping trigger type selection (*1)
External tripping
Tripping trigger type setting: EGE/LVL
TGS
Setting Parameters
Parameters are set as shown below.
Example for Setting the Abnormal Current Tripping Value
Use
1 2 3 4 5 6
V A Yrs °C s
After no key
operations 1 2 3 4 5 6
for 3 s
to change the set value.
V A Yrs °C s
When finished, press
to save the set value.
Set value saved (flashes for 3 s).
After flashing
for 3 s
Indicator Status Notation
Lit
Flashing
and
Note: 1. Parameters cannot be changed in protection level 2, or
when using the S8AS-24006N or S8AS-48008N.
2. The S8AS will start in Run Mode when power is turned
ON for the first time after shipping from the factory.
3. Refer to the S8AS User's Manual (Cat. No. Z269),
when having further settings.
*1. Not displayed in protection level 1 or 2.
*2. The S8AS-24006N and S8AS-48008N use Extended
Detection. (Cannot be changed.)
*3. The S8AS-24006N and S8AS-48008N use a startup
sequence using an offset of 0.4 s starting with the first
branch output. (Cannot be changed.)
*4. The shutdown sequence shutdown delay on the S8AS24006N and S8AS-48008N is set at 0.0 s. (Cannot be
changed.)
*5. Communications settings will not be displayed on models
that do not have communications functions.
1 2 3 4 5 6
V A Yrs °C s
17
S8AS
Test Mode
Protection Level Setting
Device startup operation can be tested by turning ON/OFF branch
outputs either individually or together. The branch outputs that are to
be used are set to be connected in Test Mode. The operation to turn
all branch outputs ON/OFF together can be used to check startup and
shutdown sequences.
A protection level can be set to prevent operating errors during normal
operation. Reading or changing parameter settings and other
operations can be restricted in three levels.
Protection
Level
Test Mode (TST) Selected
Press for 3 s.
(1)
(5)
(3)
1 2 3 4 5 6
1
2
3
V A Yrs °C s
4
5
1 2 3 4 5 6
6
1
2
3
V A Yrs °C s
4
5
Intended for
Possible operations
0
Facility designers
and manufacturers
All settings can be read and
changed.
1
Facility
maintenance
personnel
Some settings can be read and
changed.
2
On-site operators
Settings can be read but not
changed.
Select PRT (protection level) from the Mode Selection Menu and then
perform the following procedure. (The following example shows
changing to protection level 0.)
6
Setting Protection Level
(2)
(4)
1 2 3 4 5 6
1
2
3
V A Yrs °C s
4
5
6
After no key
operations
for 3 s
1 2 3 4 5 6
1
2
3
V A Yrs °C s
4
5
Mode Selection Menu
(Protection Level)
6
After no key operations for 3 s
Select TST (Test Mode) from the Mode Selection Menu and press the ENT Key.
Test Mode will be entered.
(1) When Test Mode is entered, the branch output number 1 indicator (see note) will flash and
“OFF” or “ON” will flash on the 7-segment display.
OFF flashing: Press the ENT Key to turn OFF branch output 1.
ON flashing: Press the ENT Key to turn ON branch output 1.
(2) The branch output can be selected at display (1) by using the Down (CH) Key.
Press the ENT Key to turn the output ON and OFF.
(3) If the Up (SEL) Key is pressed at display (1), all branch output number indicators will flash
and “OFF” will flash on the 7-segment display. All branch outputs can be turned OFF in this
condition.
Press the ENT Key to turn all branch outputs OFF.
(4) If the Up (SEL) Key is pressed at display (3), all branch output number indicators will flash
and “ON” will flash on the 7-segment display. All branch outputs can be turned ON in this
condition.
Press the ENT Key to turn all branch outputs ON.
(5) After completing ON/OFF testing and setting the branch outputs, press the Up (SEL) and
Down (CH) Keys simultaneously for 3 s to go to the Mode Select Menu, and then enter Run
Mode.
Parameter Initialization
All S8AS parameters can be restored to their default settings.
Set protection level 0 and then go to the Mode Selection Menu. INI
(parameter initialization) will be added to the menu. Select INI and
then perform the following procedure.
Mode Selection Menu
(Parameter Initialization)
After no key
operations
for 3 s
* The branch output number set with the Down (CH) Key will not change even when the
operating mode or parameters are changed. The branch output displayed when Test Mode is
entered will not necessarily be branch output 1.
Note: 1. In Test Mode, the branch output number indicators and 7segment display will continue to flash.
2. In Test Mode, the abnormal tripping output (TRP) will
operate if one or more of the branch outputs are not
connected. The TRP output will not operate if the operating
mode is changed.
3. If power is turned OFF in Test Mode, Test Mode will be
entered the next time power is turned ON.
Indicator Status Notation
Lit
Flashing
Parameter Initialization
Run Mode
Setting Confirmation
(Flashes for 3 s.)
Note: 1. The Mode Selection Menu is not displayed in protection
level 1 or 2. The default setting is for protection level 1.
2. Default Settings
• The operating mode will change to Run Mode.
• The parameters will change to their default settings.
• All branch outputs will be changed so they are connected.
• The protection level will change to level 1.
18
S8AS
List of Alarms
Alarm
display
A10
Name
Abnormal
voltage
tripping
A11
Abnormal
current
tripping
A12
Abnormal
total current
tripping
Alarm outputs
Power
outputs
Recovery/reset method
TRP output: OFF Total current
(normally ON)
tripping
Remove the cause of the abnormality and then press the Reset Key( ) on the
front panel or use communications reset function (S8AS-24006R and S8AS48008R only). *
Power supply will be restarted after recovery.
Note: Once an error has been reset, another reset operation cannot be
performed for at least 15 seconds.
TRP output: OFF
Cut off
(normally ON)
Remove the cause of the abnormality and then press the Reset Key( ) on the
front panel or use communications reset function (S8AS-24006R and S8AS48008R only). *
Power supply will be restarted after recovery.
Note: Once an error has been reset, another reset operation cannot be
performed for at least 15 seconds.
TRP output: OFF Total current
(normally ON)
tripping
Remove the cause of the abnormality and then press the Reset Key( ) on the
front panel or use communications reset function (S8AS-24006R and S8AS48008R only). *
Note: Once an error has been reset, another reset operation cannot be
performed for at least 15 seconds.
ALM output: OFF
ON
(normally ON)
Remove the cause of the abnormality and then press the Reset Key( ) on the
front panel or use communications reset function (S8AS-24006R and S8AS48008R only). *
Note: 1. Once an error has been reset, another reset operation cannot be
performed for at least 15 seconds.
2. The alarm status will be reset if the cause of the alarm has been
removed when the power supply is reset.
A21
Undervoltage
alarm
A23
Maintenance
LEF output: OFF
forecast
(normally ON)
monitor output
ON
The replacement time specified for the S8AS has become less than the value set
for the maintenance forecast monitor function. Either replace the S8AS or change
the set value.
A23/HOT
Overheating
alarm
ON
Take steps to reduce the internal temperature of the S8AS. The error will
automatically be cleared when the temperature becomes stable. However, if the
overheating alarm stays ON for more than 3 hours, it can no longer be cleared.
Be sure to clear the error within 3 hours.
LFE output: OFF
(normally ON)
OverTMP output: OFF
The alarm display and over-temperature output will automatically be reset if the
temperature
ON
(normally ON)
temperature remains below the set value minus 3°C for at least 5 s.
output
Note: Alarms will be displayed in order of priority if more than one alarm occurs at the same time.
Order of priority: A10, A12, A11, A23/HOT, A21, A23, A30.
* Enabling or disabling the functionality to reset errors by turning the power supply OFF and then ON can be set using the Reset Method Setting
(RST) parameter. However, the settings for the S8AS-24006N and S8AS-48008N cannot be changed.
(Initial setting: Errors can be reset by turning the power supply OFF and ON again.)
A30
19
S8AS
Alarm Display
Communications (S8AS-24006R/48008R)
The S8AS displays alarms according to the parameters set in Setting
Mode. The alarm number and detected value are alternated on the
display for each alarm.
The built-in RS-485 port can be used to connect special Support Tool
to set parameters, monitor, perform tripping operations for branch
outputs, and perform other remote monitoring and control operations
from a network.
Example: Abnormal Current Tripping Alarm at Branch Output 4
0.5 s
1 2 3 4 5 6
V A Yrs °C s
0.5 s
1 2 3 4 5 6
V A Yrs °C s
0.5 s
0.5 s
Current when
alarm occurred
Note: Indicator Status Notation
Lit
Flashing
1 2 3 4 5 6
V A Yrs °C s
Note: Alarms will be displayed in order of priority if more than one
alarm occurs at the same time.
Order of priority: A10, A12, A11, A23/HOT, A21, A23, A30.
Resetting Alarms
When an alarm is displayed, remove the cause of the alarm and then
press the Reset Key (
) for at least 3 s.
The following display will appear and the alarm will be reset.
For information on resetting alarms, refer to List of Alarms on the
previous page.
Type
RS-485
Communications
method
Half-duplex
Sync method
Start-stop
Baud rate
4,800 or 9,600 bps
Transmitted code
ASCII
Data bit length
7 or 8 bits
Stop bit length
1 or 2 bits
Error detection
Vertical parity and BCC
Parity check
None, even, or odd
Protocol
CompoWay/F
Support Tool (S8AS-24006R/48008R)
The Support Tool is used to set and monitor models that support
communications. Parameters can be set, operation can be monitored,
and parameter files can be managed.
Support Tool Functions
• Reading and writing parameter settings
• Monitoring present values
• Monitoring status (cutoff status, normal/error status)
Applicable OS: Windows 2000 or XP
Visit OMRON's website for downloading the Support Tool.
20
S8AS
Dimensions
(Unit: mm)
S8AS Smart Power Supplies
124.7
122
S8AS-24006
S8AS-24006N
160
Three, M4 square washers
10
S8AS-24006
POWER SUPPLY
L
N
1 2 3 4 5 6
INPUT
1
50/60Hz AC100-240V 3.8A
34.9
6
115
+1
+2
+3
+4
+5
+6
-1
-2
-3
-4
-5
-6
M4 square washers 4.5
(sliding: 15 max.)
160
Three, M4 square washers
10
122
5
-V
-V
5.08
131.8
142.4
124.7
4
V.ADJ
TRP LOW LFE TMP COM + TRG -
S8AS-24006R
V A Yrs °C s
3
+V
Class2
OUTPUT
DC 24V 3.8A
DC ON
2
S8AS-24006
POWER SUPPLY
A(-)
B(+)
RS485
L
N
1 2 3 4 5 6
INPUT
1
50/60Hz AC100-240V 3.8A
34.9
5
6
115
-V
-V
+1
+2
+3
+4
+5
+6
-1
-2
-3
-4
-5
-6
M4 square washers 4.5
(sliding: 15 max.)
5.08
131.8
124.7
122
4
V.ADJ
TRP LOW LFE TMP COM + TRG -
S8AS-48008
S8AS-48008N
V A Yrs °C s
3
+V
Class2
OUTPUT
DC 24V 3.8A
DC ON
2
230
10
Three, M4 square washers
S8AS-48008
POWER SUPPLY
L
N
INPUT
1 2 3 4 5 6 7 8
V A Yrs °C s
50/60Hz AC100-240V 7.4A
1
34.9
Class2
OUTPUT
DC 24V 3.8A
DC ON
3
4
5
6
7
8
+V
115
-V
-V
+1
+2
+3
+4
+5
+6
-1
-2
-3
-4
-5
-6
+7
+8
V.ADJ
TRP LOW LFE TMP COM + TRG -
-7
-8
M4 square washers
(sliding: 15 max.)
5.08
131.8
S8AS-48008R
2
4.5
142.4
124.7
122
10
230
Three, M4 square washers
S8AS-48008
POWER SUPPLY
L
A(-)
N
B(+)
RS485
INPUT
1 2 3 4 5 6 7 8
V A Yrs °C s
50/60Hz AC100-240V 7.4A
1
Class2
OUTPUT
DC 24V 3.8A
34.9
DC ON
3
4
5
6
7
8
115
+V
-V
-V
+1
+2
+3
+4
+5
+6
-1
-2
-3
-4
-5
-6
+7
+8
V.ADJ
TRP LOW LFE TMP COM + TRG -
5.08
131.9
2
-7
-8
M4 square washers
(sliding: 15 max.)
4.5
Mounting Rail (Material: Aluminum)
PFP-100N
PFP-50N
7.3±0.15
4.5
Model
35±0.3
15
25
10
25
25
1,000 (500) *
10
25
15(5) *
27±0.15
1
PFP-100N
PFP-50N
*Values in parentheses
are for the PFP-50N.
Mounting Rail (Material: Aluminum)
21
S8AS
Mounting Rail (Material: Aluminum)
PFP-100N
PFP-50N
7.3±0.15
4.5
Model
35±0.3
15
25
10
25
25
10
25
27±0.15
PFP-50N
1
15(5) *
1,000 (500) *
PFP-100N
*Values in parentheses
are for the PFP-50N.
Mounting Rail (Material: Aluminum)
16
PFP-100N2
4.5
35±0.3 27
15
25
10
25
25
1,000
10
25
15
Model
24
29.2
1
PFP-100N2
1.5
Mounting Rail (Order Separately)
10
End Plate
PFP-M
6.2
1.8
Model
M4 × 8
pan-head
screw
50
PFP-M
1
1.8
35.5 35.5
11.5
1.3
10
M4 spring
washer
4.8
22
S8AS
Safety Precautions
Refer to Safety Precautions for All Power Supplies.
Attachment to the DIN Rail
!CAUTION
To mount the block on a DIN Rail, until
it makes a clicking sound, pull down
the Rail stopper hook portion (A) of the
Block onto the Rail, and press the
Block in direction (B) to lock it in place.
Minor electric shock, fire, or Product failure may
occasionally occur. Do not disassemble, modify, or repair
the Product or touch interior of the Product.
Minor burns may occasionally occur. Do not touch the
Product during power is being supplied or immediately
after power is turned OFF.
A
B
To dismount the Block, pull down
portion (C) with a flat-blade
screwdriver and pull out the Block.
Minor injury may occasionally occur due to electrical
shock. Do not touch the terminals while power is being
supplied. Also, be sure to close the terminal cover after
wiring the terminals.
Fire may occasionally occur. Tighten terminal screws to
the specified torque.
30 mm min.
C
Rail stopper
Wiring
Precautions for Safe Use
Mounting
• The long-term reliability of the S8AS can be increased by installing
it properly and providing sufficient heat dissipation. Use the S8AS
within the derating curve. The S8AS is designed to radiate heat by
means of natural air circulation. Provide appropriate space as
shown below to allow air flow around the Power Supplies.
• Poor heat dissipation resulting from improper installation
conditions may occasionally deteriorate or damage internal parts
and also cause the maintenance forecast monitor function to not
operate properly. Do not use any mounting orientation other than
a standard one.
• Poor heat dissipation may deteriorate or damage internal parts. Do
not loosen the screws on the side of the Product.
• Do not allow any pieces of metal or conductors, or any clippings or
cuttings resulting from installation work to enter the Product.
S8AS-24006
S8AS-24006
POWER SUPPLY
POWER SUPPLY
N
1 2 3 4 5 6
INPUT
1
50/60Hz AC100-240V 3.8A
DC ON
3
4
5
6
N
INPUT
-V
-V
+2
+3
+4
-2
-3
-4
1
50/60Hz AC100-240V 3.8A
+5
+6
DC ON
-1
1 2 3 4 5 6
-5
-6
2
V A Yrs °C s
3
4
5
Screw
terminals
6
-V
-V
+1
+2
+3
+4
+5
+6
-1
-2
-3
-4
-5
-6
V.ADJ
TRP LOW LFE TMP COM + TRG -
20 mm min.
Terminals
Name
Recommended
wire diameter
Wire
type
Torque
Wire
stripping
length
AC input
terminals and
protective
earth (PE)
terminal
AWG14 to 16
(cross-sectional Solid or 9.6 in.lb.
8 to
area of 0.823 to stranded (1.08 N·m) 10 mm
2
2.081 mm )
Branch output
terminals (−),
UL Standard
AWG12 to 14
8 to
(cross-sectional Solid or 12 in.lb.
area of 2.081 to stranded (1.36 N·m) 10 mm
2
3.309 mm )
+V
Class2
OUTPUT
DC 24V 3.8A
V.ADJ
TRP LOW LFE TMP COM + TRG -
L
+V
Class2
OUTPUT
DC 24V 3.8A
+1
2
V A Yrs °C s
Recommended Wire Diameter
75 mm
min.
Air flow
L
• Connect the ground completely. The ground is a protective earth
(PE) terminal specified in safety standards. If the ground is not
connected completely, electric shock or malfunction may occur.
• Minor fire may possibly occur. Ensure that input and output
terminals are wired correctly.
• Heat generated by wiring materials may cause the temperature of
internal parts to increase, which may result in deterioration of or
damage to the internal parts. Select the wiring materials according
to the current that is being used. Using the wiring materials, torque,
and wire stripping lengths in the following table is recommended to
prevent smoke or fire of the wire material due to an abnormal load.
75 mm
min.
Screwless
terminals
AWG12 to 20
Branch output
(cross-sectional Solid or 8.8 in.lb.
terminals (−),
area of 0.517 to stranded (1.0 N·m)
CSA Standard
3.309 mm2)
8 to
10 mm
Branch output
positive
terminals, branch
output negative
terminals, I/O
signal terminals,
and
communications
terminals
10 mm
AWG12 to 24
(cross-sectional Solid or
--area of 0.2 to
stranded
2.5 mm2)
• Do not push more than 100 N of force to the terminal block when
tightening screws.
• The lock screws on both sides of the screwless connectors are not
tightened at the factory.
• Be sure to tighten the lock screws on the sides of the screwless
connector after connecting it to the S8AS. When removing a
screwless connector, be sure the lock screws are completely loose
before pulling on the connector.
• Be sure to remove the sheet covering the Product during
installation before turning ON the power.
23
S8AS
Installation Environment
• Do not use the Product where it would be subjected to shock or
vibration. A device such as a contact breaker may be a vibration
source. Set the Product as far as possible from possible sources of
shock or vibration. Additionally, install a PFP-M End Plate on each
end of the Product after mounting it to a DIN Rail.
• If the Product is used in an area with excessive electronic noise, be
sure to separate the Product as far as possible from the noise
sources.
Ambient Operating and Storage Environment
• Store the Product at an ambient temperature of −25 to 65°C and
relative humidity of 25% to 90%.
• Internal parts may occasionally be deteriorated or damaged. Do
not use the Product in conditions exceeding the derating curve (in
portion (1) of the Derating Curve on page 8).
• Use the Product where the relative humidity is 25% to 85%.
• Do not use the Product where it would be subjected to direct
sunlight.
• Do not use the Product where it would be subjected to the
possibility of penetration of liquid, foreign substance, or corrosive
gas.
• To maintain performance of the maintenance forecast monitor,
make sure the following conditions are satisfied for long-term
storage. For storage exceeding three months, keep the Product at
a temperature of −20°C to 30°C and a humidity of 25% to 70%.
Output Voltage Adjustment
• The output voltage adjuster (V.ADJ.) may possibly become
damaged. Do not apply more than the required force.
• Do not exceed the rated output capacity and rated total output
current after adjusting the output voltage.
Periodic Inspections
Under normal operating conditions, the Product will require several
years or even more than ten years until the maintenance forecast
monitor function operates. When using the Product for an extended
period of time, perform the following procedure periodically to confirm
that the output for the maintenance forecast monitor function (LFE) is
operating correctly.
a) Change to Run Mode.
b) Confirm that the (LFE) output is ON (i.e., that there is electrical
continuity between (LEF) and (COM)).
Precautions for Correct Use
Tripping Performance
• When the tripping alarm output operates, always remove the cause
of the output first and then reset the alarm.
• When using a load with a fixed-power operation, the S8AS may
cause a cutoff when the power supply is turned OFF.
• Outputs may be cut off by the abnormal voltage protection with
loads that generate reverse peak electromotive force.
• Tripping performance is depends on the ambient operating
temperature. Use the Product within the derating range. Refer to
the Derating Curve on page 8.
• It is conceivable that internal parts may be deteriorated or
damaged. Do not repeatedly perform cutoff or recovery operations
more than necessary.
Maintenance Forecast Monitor Function
The accuracy of the maintenance forecast monitor function will be
reduced in applications where the AC input turns ON and OFF
frequently.
Total Peak Output Current
The S8AS is designed to provide a temporary peak current to provide
the overcurrent required to start load devices.
The total peak output current for all branch outputs combined is given
below. However, if even one of the following conditions is not satisfied
by the total current, all branch outputs will be cut off to ensure safety
based on the amount of peak current and the usage time.
• 240-W Models
Input voltage range: 200 to 240 VAC
Total peak current/Peak current pulse width:
17 A max./2 s max.
15 A max./5 s max.
13 A max./10 s max.
12 A max./20 s max.
• 480-W Models
Input voltage range: 200 to 240 VAC
Total peak current/Peak current pulse width:
27 A max./1 s max.
25 A max./2 s max.
22.5 A max./5 s max.
Note: 1. If the input voltage range is outside of the range given
above, or if the total output current exceeds the maximum
peak current, the S8AS may be cut off due to unstable
internal operation.
2. After the load device has been started, ensure that the total
current in steady state remains within the rated values.
3. When the peak current has exceeded the rated current, do
not allow the peak current to flow again for the next 60
seconds.
Startup Sequence and Shutdown Sequence
The sequencing functions are designed for the branch outputs of one
S8AS. There is no synchronizing processing between S8AS when
more than one S8AS is used.
Startup Delay
The startup delay will not operate when a relay or other device is used
for ON/OFF control on the output side of the S8AS, so a cutoff
operation may occasionally occur.
Dielectric Strength Test
• The S8AS is designed to withstand 3,000 VAC for 1 minute
between the AC input terminals collectively and the branch output,
I/O signal, or communications terminals collectively. When testing,
set the cutoff current for the withstand voltage test device to 20 mA.
• The S8AS may possibly be damaged from the impulse voltage if a
testing device switch is used to abruptly apply or cut off 3000 VAC.
Increase the applied voltage gradually using the voltage
adjustment on the testing device.
• When testing terminals together, always short the specified
terminals so that the voltage is applied to all of the terminals at the
same time.
24
S8AS
Insulation Resistance Test
• When testing the insulation resistance, use a DC resistance meter
at 500 VDC.
• To prevent damage, always short branch output terminals (+/−), all
I/O terminals, and communications terminals before testing.
Prohibition of Parallel Connection
Do not connect branch outputs from the S8AS in parallel. Also, do not
connect the branch outputs in parallel with branch outputs of other
S8AS Power Supplies.
S8AS
Output Voltage Adjustment
• If the output voltage is set to less than 20 V (default setting), the
undervoltage alarm may be activated.
• Do not exceed the rated output capacity and rated total output
current after adjusting the output voltage.
• The output voltage may increase beyond the allowable voltage
range rated voltage +10% when the V.ADJ adjuster is used. When
adjusting the output voltage, check the output voltage of the power
supply to make sure that the load is not damaged.
Displaying the Output Voltage
S8AS
S8AS
Connections cannot be made in parallel
with other branch output circuits.
The voltage detection is performed on the voltage after AC/DC
conversion in the interval circuits. The displayed voltage will be
somewhat different from the value at the output terminals of the power
source due to internal voltage drop. To confirm correct output
voltages, measure the voltages at the branch output terminals.
Connecting Backup Devices
No Output Voltage
A harmonic current suppression circuit is built into the Power Supply.
This circuit can create noise when the input is turned ON, but it will
last only until the internal circuits stabilize and does not indicate any
problem in the Product.
The internal circuit's overcurrent protection or overvoltage protection
may operate. Alternatively, the latch protection circuit may operate if
there is a lightning inrush or other large voltage applied to the input.
Contact your OMRON representative if there is still no output voltage
after checking the following two points:
• Checking Overcurrent Protection
Check whether the load is in an overcurrent or short-circuited state.
Remove the wires to the load before checking.
• Checking Overvoltage Protection and Latching Protection
Turn the power supply OFF and leave it OFF for at least 3 minutes,
then turn it ON again.
Do not connect a battery or other backup power supply to the output
of the Product.
Harmonic Current Suppression Circuit
Startup Time
At startup, the S8AS will check hardware and software before starting
the operation of branch outputs. A time of approximately 3 seconds is
required for these self-diagnostic functions. Take this time into
account when designing the system.
External Tripping Input
• Wire the polarity of the external tripping input correctly.
• After completing wiring, confirm that operation is correct.
Tripping Alarm Output,
Undervoltage Detection Output, Maintenance
Forecast Monitor Output,
and Over-temperature Output
Photoswitch outputs: 30 VDC max., 50 mA max., residual voltage
when ON: 2 V max., leakage current when OFF: 0.1 mA max.
• Wire all output signal circuits correctly.
• Internal current control circuits are not provided internally for output
signals. Do not allow the output current to exceed 50 mA.
• After completing wiring, confirm that the circuits operate correctly.
25
Terms and Conditions Agreement
Read and understand this catalog.
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you
have any questions or comments.
Warranties.
(a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship
for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron
disclaims all other warranties, express or implied.
(b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER
ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE
PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.
Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the
Products or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at
Omron’s election, to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or
replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount
equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty,
repair, indemnity or any other claims or expenses regarding the Products unless Omron’s analysis confirms that the Products
were properly handled, stored, installed and maintained and not subject to contamination, abuse, misuse or inappropriate
modification. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall
not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or
electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice,
recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above
warranty.
See http://www.omron.com/global/ or contact your Omron representative for published information.
Limitation on Liability; Etc.
OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted.
Suitability of Use.
Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the
combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable
third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself
is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine,
system, or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product
with respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE
QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS,
AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE
OVERALL EQUIPMENT OR SYSTEM.
Programmable Products.
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence
thereof.
Performance Data.
Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining
suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate
it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability.
Change in Specifications.
Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our
practice to change part numbers when published ratings or features are changed, or when significant construction changes are
made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers
may be assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at
any time to confirm actual specifications of purchased Product.
Errors and Omissions.
Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
2014.2
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Automation Company
http://www.ia.omron.com/
(c)Copyright OMRON Corporation 2014 All Right Reserved.
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