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Digital Heater Element Burnout Detector
K8AC-H
A high-precision Heater Element
Burnout Detector compatible with a
wide-range of heater control methods.
• Push-in terminals reduce the workload. *1
• Scaling *1
• NPN or PNP equivalent output. *1
• Lineup includes models compatible with many heater control methods,
including ON/OFF control, phase control, and cyclic control.
• High-precision heater burnout alarm with digital measurement.
• Contributes to preventative maintenance.
• If the gate function is disabled, the gate input can be used as an
undercurrent/overcurrent relay or for motor or lamp loads.
• Undercurrent detection values can be set separately for CT1 and
CT2. *2
• CE marking and cUL certified (K8AC-H2@@@).
*1. K8AC-H2@@@ Series only.
*2. The overvoltage detection value is the same for the CT1 and CT2. Also, there
is one undercurrent output.
Wide Current Input Range: 0.200 to 200.0 A AC.
Note: 1. Consult with your OMRON representative before using the K8AC with
phase control or cyclic control under the following conditions.
For the most recent information on models that have been certified for
• Using multiple heaters with different heater capacities
safety standards, refer to your OMRON website.
• Using heaters with varying heater resistance (e.g., halogen heaters)
2. The K8AC-H is designed to monitor for element burnouts on heaters
controlled with power regulators that used a three-alarm method.
Normal monitoring is not possible for circuits that use a power regulator with a six-alarm method.
Features
High-precision Heater Burnout Alarms with
High-resolution Digital Measurement
Burnout Alarm Possible for One of Multiple
Heater Elements
Push-in Terminals for Reduced Wiring Work
(K8AC-H2@@@ Series Only)
Push-in terminals have no screws to come loose, which eliminates
the need to control screw tightening torque and retighten screws and
helps to reduce your workload.
Heater burnout is detected by digitally processing minor current
fluctuations.
RST
G3PE
Three-phase
SSR
E5@@
Digital
Temperature
Controller
Easily connect terminals using ferrules with insulation sleeves.
Easy Scaling Using the External CT Ratio
and Number of CT Passes
(K8AC-H2@@@ Series Only)
Current Transformer
K8AC-H@
Digital Heater
Element Burnout
Detector
Electric
oven
Three-phase
delta-connected heater
Easily set the scaling just by inputting (1) the CT ratio and (2) the
number of CT passes.
External
CT
@A/1A
(1) CT ratio K8AC-CT@
Current Transformer
(2) Number of CT passes
Heater
1
K8AC-H
Compatible with Various Heater Control
Methods
Models with heater burnout alarms for ON/OFF control, phase
control, and cyclic control have been added to the lineup.
Check the current input range, connected CT, and relay output type
before selecting the model from the product specifications.
Note: Both single-phase and three-phase heaters are supported.
The transistor output from the K8AC-H2@@N
can be used as either an NPN open-collector
output or a PNP equivalent output.
The transistor output of the K8AC-H2@@N uses a photocoupler for
isolation with the internal circuits, and so either an NPN opencollector output or a PNP equivalent output can be used.
NPN Output
PNP Equivalent Output
Overcurrent and SSR Failure Detection from
Heater Layer Short Circuits.
• Overcurrent can be detected from layer short circuits in addition to
providing heater burnout alarms with overcurrent detection
settings.
• SSR short circuit failures and SSR open circuit failures are
detected by monitoring the heater current and the control outputs
from the temperature controller.
• Detecting SSR failures enables promptly discovering that
temperature control has failed.
Heater Burnout Alarms for Cyclic Control or
Phase Control Heaters
(K8AC-H@@P@)
The burnout detection value is shifted according to the
control output value from the temperature controller.
Heater current
• Analog control is performed on the output power according to the
temperature controller's current output (4 to 20 mA) when phase
control or cyclic control is used.
• Heater burnout alarms are stable with the K8AC-H because the
heater burnout alarm values are linked with the control output
value from the temperature controller.
Heater current
Heater burnout
alarm value
Heater Burnout Alarm Value
The heater burnout alarm value shifts
according to the control input (4 to
20 mA) from the temperature controller.
20 mA
4 mA 7 mA
Control output from temperature controller
Compatible with Gradient Settings of Power Controllers
When using gradient settings with a power controller, set a gate
current level that is suitable for the gradient settings.
Output current
100%
Measurement range
Gradient setting: 100%
Gradient setting: 50%
0%
Control signal
4 mA
14 mA
20 mA
Not detected
Detected
Operation gate current level
Note: Set the heater burnout alarm value based on the current at the
heater's rated input.
2
Load
Load power supply
Load
Load power supply
Preventive Maintenance
The run time can be measured by the K8AC-H.
Managing the run time history until burnouts occur is useful for
diagnosis and preventative maintenance for equipment.
Count the Total Number of Alarms Output
Set the upper and lower limits to count the total number of alarms that
have been output.
K8AC-H
Model Number Structure
Model Number Legend
K8AC-H@@@@ -FLK 100-240VAC
1
2 3 4 5
6
7
1. Basic Model
K8AC-H: Digital Heater Element Burnout Detector
2. Product Type
1: Screw terminals
2: Push-in terminals (Power Input: Screw Terminals.)
3. Current Input Range
1: 0.200 to 2.200 A
2: 2.00 to 22.00 A
3: 20.0 to 200.0 A
4. Heater Control Type
C:ON/OFF control (SSR or contactor)
P: Phase control or cyclic control
5. Output Type
C: Contact output (one SPDT relay contact output)
T: Transistor output (two NPN open collector outputs) *1
N: Transistor outputs (Two outputs: either NPN open-collector
output or PNP equivalent output can be used.) *2
*1. K8AC-H1@@T only.
*2. K8AC-H2@@N only.
6. Communications Specifications
FLK: RS-485
7. Power Supply Voltage
100-240VAC: 100 to 240 VAC
Ordering Information
Digital Heater Element Burnout Detectors
Models with Push-in Terminals (Power Input: Screw Terminals)
Power
supply
voltage
Heater control
method
ON/OFF control
SSR control
100 to
240 VAC
Phase control
Cyclic control
Input
specifications
Two
current
inputs
(for either
singlephase or
threephase)
Output specifications
Communications
output
One relay output
Two transistor
outputs
One relay output
RS-485
Two transistor
outputs
Applicable Current Transformer
Current input range
0.200 to 2.200 A
2.00 to 22.00 A
20.0 to 200.0 A
K8AC-H21CC-FLK
K8AC-H22CC-FLK
K8AC-H23CC-FLK
K8AC-H21CN-FLK
K8AC-H22CN-FLK
K8AC-H23CN-FLK
K8AC-H21PC-FLK
K8AC-H22PC-FLK
K8AC-H23PC-FLK
K8AC-H21PN-FLK
K8AC-H22PN-FLK
K8AC-H23PN-FLK
K8AC-CT200 or
K8AC-CT200L
K8AC-CT20S or K8AC-CT20L
Current
Transformers
(sold separately)
Note: Consult with an OMRON representative if multiple heaters with different capacities are to be connected in parallel or if the heater resistance
will vary.
Models with Screw Terminals
Power
supply
voltage
Heater control
method
ON/OFF control
SSR control
100 to
240 VAC
Phase control
Cyclic control
Input
specifications
Two
current
inputs
(for either
singlephase or
threephase)
Production To Be Discontinued at the End of March 2009
Output specifications
Communications
output
One relay output
Two transistor
outputs
One relay output
RS-485
Two transistor
outputs
Applicable Current Transformer
Current input range
0.200 to 2.200 A
2.00 to 22.00 A
K8AC-H11CC-FLK
K8AC-H12CC-FLK
K8AC-H13CC-FLK
K8AC-H11CT-FLK
K8AC-H12CT-FLK
K8AC-H13CT-FLK
K8AC-H11PC-FLK
K8AC-H12PC-FLK
K8AC-H13PC-FLK
K8AC-H11PT-FLK
K8AC-H12PT-FLK
K8AC-H13PT-FLK
K8AC-CT20S or K8AC-CT20L
20.0 to 200.0 A
K8AC-CT200 or
K8AC-CT200L
Current
Transformers
(sold separately)
Note: Consult with an OMRON representative if multiple heaters with different capacities are to be connected in parallel or if the heater resistance
will vary.
Optional Products (Sold Separately)
Current Transformers
Through-hole diameter
Rated current
5.8-mm dia.
Model
K8AC-CT20S
Rear-surface mounted with screws
Binding band
K8AC-CT20L
20.0 to 200.0 A
Rear-surface mounted with screws
Binding band
K8AC-CT200
20.0 to 200.0 A
Surface-mounted with screws
K8AC-CT200L
0.200 to 22.00 A
12-mm dia.
30-mm dia.
Installation method
Surface-mounted with screws
Note: When selecting a Current Transformer, make sure that the rated current of the heater does not exceed the rated upper limit or the rated
current of the Current Transformer.
3
K8AC-H
Specifications
Ratings
Heater control method
Item
Models for ON/OFF control (e.g., SSRs or contactors)
Models for phase control and cyclic control
K8AC-H@@C@-FLK
K8AC-H@@P@-FLK
Model
Power supply voltage
100 to 240 VAC (50/60 Hz) *2
Operating voltage range
85% to 110% min. of the rated power supply voltage (85 to 264 V)
Power consumption
(at max. load)
35 VA max.
Applicable circuits
Single-phase or three-phase (with same model)
Applicable control methods
ON/OFF control (e.g., temperature controller with relay output)
SSR control (e.g., temperature controller with voltage output)
Cyclic control and phase control (e.g., temperature controller with current output)
Input signal and applicable Current
Transformer
Current measurement via two special Current Transformers (Burnout alarm set value can be set separately for each Current
Transformer.)
Refer to Current Measurement Ranges by Model on page 6 for information on the current measurement range and
applicable Current Transformer.
Measurement method
Gate input
signal *1
Outputs
Average value calculation
ON/OFF control
Voltage = 12/24 VDC (continuous input possible to 30 VDC)
Input impedance = 4 kΩ min.
---
SSR control
ON voltage: 9.6 VDC max., OFF voltage: 1 VDC min.
Minimum voltage pulse ON time for burnout detection:
200 ms min.
Input impedance = 4 kΩ min.
---
Cyclic and phase control
---
4 to 20 mA DC (Burnout detection is possible for an input of
7 mA or greater.)
Input impedance = 50 Ω max.
Relay contact outputs:
K8AC-H@@@C-FLK
One SPDT relay contact output
Same output used for heater burnout, SSR short circuit, SSR open circuit, and heater layer short circuit alarms.
0.3 A at 125 VAC (resistive load), 1 A at 30 VDC (resistive load)
Maximum switching capacity: 37.5 VA, 30 W
Mechanical durability: 50 million operations min., electrical durability: 100,000 operations min.
Transistor outputs
(NPN open-collector):
K8AC-H1@@T-FLK
Two transistor outputs (NPN open-collector)
One ALM output: Outputs heater burnout alarm or heater layer short circuit alarm.
One SSR error output: Outputs SSR short circuit alarm or SSR open circuit alarm.
12 to 24 VDC, 50 mA max.
OFF leakage current: 100 μA max., ON residual voltage: 1.5 V max.
Transistor outputs:
K8AC-H2@@N-FLK
Two transistor outputs: Can be used either NPN open-collector outputs or PNP equivalent outputs.
One ALM output: Outputs heater burnout alarm or heater layer short circuit alarm.
One SSR error output: Outputs SSR short circuit or SSR open circuit detection.
12 to 24 VDC, 50 mA
OFF leakage current: 100 μA max., ON residual voltage: 1.5 V max.
Communications
RS-485 1200, 2400, 4800, 9600, 19200 bps (CompoWay/F)
Indication method
7-segment digital display: No. of display digits: 4 (red)
LED status indicators: RUN (green), ADJ (orange), SET (orange), GATE (orange), SSR (orange) and ALM (orange)
Main functions
Heater burnout alarm, heater layer short circuit alarm, SSR short circuit detection, SSR open circuit detection, voltage
fluctuation compensation, output ON-delay timer, energy-saving mode, key protection, and power supply voltage
measurement
Operating
Ambient
temperature Storage
Ambient
humidity
−10 to 55°C (with no icing or condensation)
−25 to 65°C (with no icing or condensation)
Operating
25% to 85% (with no condensation)
Storage
25% to 85% (with no condensation)
Altitude
2,000 m max.
Accessories
Instruction sheet
Case material
PC (Polycarbonate)
Case color
N1.5 (clear black)
Mounting method
Mounting to a DIN Track
*1. The gate input enables correct measurement by syncing to heater control.
When using it with ON/OFF control, receive the relay contact output from the temperature controller or other controller with a 24-VDC auxiliary
relay and then use this signal as the gate input signal to the K8AC.
The gate function can also be disabled. If it is disabled, the gate input can be used as a normal undercurrent/overcurrent relay.
*2. When using the K8AC-H for a 380 to 480-V AC power supply circuit, use a step-down transformer. Contact your OMRON representative for
information on transformers.
*3. Order the Current Transformers separately.
4
K8AC-H
Characteristics
Heater control method Models for ON/OFF control (e.g., SSRs or contactors)
Item
Heater current
input
(at 10 to 30°C)
category II
Model
Models for phase control and cycle control
K8AC-H@@@C@-FLK
K8AC-H@@P@-FLK
Input range
[email protected]@@: 0.200 to 2.200 A (Current Transformer: K8AC-CT20S (5.8 dia.), K8AC-CT20L (12 dia.) *1)
[email protected]@@: 2.00 to 22.00 A (Current Transformer: K8AC-CT20S (5.8 dia.), K8AC-CT20L (12 dia.) *1)
[email protected]@@: 20.0 to 200.0 A (Current Transformer: K8AC-CT200 (12 dia.), K8AC-CT200L (30 dia.) *1)
Measurement accuracy
±3% rdg ±10 digits max. *2
Voltage
fluctuation
compensation
category II
Input range
85 to 264 VAC
Measurement accuracy
±3% rdg ±10 digits max.
Gate input
Input range
0 to12 VDC or 0 to 24 VDC
ON: 9.6 VDC max., OFF: 1 VDC min.
±6% rdg ±10 digits max. (at control level of 100%) *2
4 to 20 mA DC
Display cycle
Selectable: Immediate, 0.2 s, 0.5 s, 1.0 s
Output ON-delay time
0.0 to 99.9 s (operating time)
Soft start time
0.0 to 99.9 s (used when using the soft start function of a Power Controller)
Output reset method
Automatic reset
Alarm hysteresis
1 to 999 digits
Output response time
500 ms max.
Insulation resistance
20 MΩ min.
Between terminals and case
Between power supply terminals/CT primary terminals and gate input terminals/communications terminals
Between power supply terminals/CT primary terminals and output terminals
Between gate input terminal/communications terminals and output terminals
Dielectric strength
2,000 V for 1 min
Between terminals and case
Between power supply terminals/CT primary terminals and gate input terminals/communications terminals
Between power supply terminals/CT primary terminals and output terminals
Between gate input terminal/communications terminals and output terminals
Noise immunity
Power supply terminals normal/common mode: ±1,500 V (startup 1-ns square-wave noise, pulse width: 1 μs/100 ns)
Vibration resistance
Vibration: 10 to 55 Hz, Acceleration: 50 m/s2 for 5 min with 10 sweeps each in X, Y, and Z directions
150 m/s2 (100 m/s2 for relay contacts) 3 times in 6 directions in X, Y, and Z directions
Shock resistance
Maximum
allowable input
Input impedance
3.5 s max.
Current Transformer
primary current
[email protected]@@: 4 A: 30 s, 12 A: 1 s
[email protected]@@: 40 A: 30 s, 120 A: 1 s
[email protected]@@: 400 A: 30 s, 1,200 A: 1 s
Gate signal: 4 to 20 mA
40 mA DC continuous
Voltage pulse gate input
30 VDC continuous
Gate signal: 4 to 20 m
50 Ω max.
Voltage pulse gate input
4 kΩ min.
Weight
Approx. 200 g
Memory protection
Non-volatile memory (number of writes: 100,000 operations)
Installation environment
Installation Category 2, Pollution Class 2
Approved standards
UL61010-1 and CAN/CSA C22.2 No.61010-1-04 (UL pending)
EN 61010-1 (IEC 61010-1) (TÜV evaluation)
EMI:
Radiated Interference Electromagnetic Field Strength:
Noise Terminal Voltage:
EMS:
ESD Immunity:
EMC
Electromagnetic Immunity:
Fast Transient Burst Immunity:
Surge immunity:
Conducted Noise Immunity
Voltage Dip/Interrupting Immunity
EN61326-1 Industrial electromagnetic environment
EN55011 Group 1, class A
EN55011 Group 1, class A
EN61326-1 Industrial electromagnetic environment
EN61000-4-2: 4 kV (contact discharge)
8 kV (air discharge)
EN61000-4-3: 10 V/m 1 kHz sine wave amplitude modulation
(80 MHz to 1 GHz)
EN61000-4-4: 2 kV (power line)
1 kV (I/O signal line)
EN61000-4-5: 1 kV (line to line, power line)
2 kV (line to ground, power line)
EN61000-4-6: 3 V (0.15 to 80 MHz)
EN61000-4-11: 0.5 cycle, 0.180°,100% (rated voltage)
Note: For phase control, the accuracy is the value when the control value of the power regulator is 100% (when the waveform of the heater current
is a sine wave). “rdg” is the error in the reading of the input current.
*1. The Current Transformers are sold separately.
*2. The values for measurement current apply when the K8AC-H is used in combination with a Current Transformer.
5
K8AC-H
Current Measurement Ranges by Model
Item Model [email protected]@@-FLK [email protected]@@-FLK
Current
measure- 0.200 to 2.200 A AC 2.00 to 22.00 A AC
ment
range
[email protected]@@-FLK
20.0 to 200.0 A AC
200.0 A
200 A
2A
22.00 A
20.0 A
2.200 A
0.200 A
Current
Transformer
Item
Load
Resistive load (cosφ = 1)
Rated load
125 VAC, 0.3 A, 30 VDC, 1 A
Maximum contact voltage
125 VAC, 60 VDC
Maximum contact current
1A
Maximum switching capaci37.5 VA, 30 W
ty
100 A
20 A
I/O Ratings
Relay Contact Output
2.00 A
K8AC-CT200:
K8AC-CT20S: 5.8-mm through-hole diameter 12-mm through-hole
diameter
or
or
K8AC-CT200L:
K8AC-CT20L: 12-mm through-hole diameter
30-mm through-hole
diameter
Minimum applicable load
(failure rate P value, reference value)
5 VDC, 10 mA
Mechanical life expectancy
50,000,000 operations min. (at a switching
frequency of 18,000 times/h)
Electrical life expectancy
(Ambient temperature condition: 20°C)
100,000 operations min. (at rated load and
switching frequency of 1,800 times/h)
Transistor Output
Maximum load voltage
12 to 24 VDC (+10%, −15%)
Maximum load current
50 mA
OFF leakage current
100 μA max.
ON residual voltage
1.5 V max.
Communications Specifications
Item
6
Communications
RS-485
Transmission method
Two-wire, half-duplex
Synchronization method
Start-stop synchronization
Baud rate
1,200, 2,400, 4,800, 9,600, or 19,200 bps
Transmission code
ASCII
K8AC-H
Connections
Terminal Arrangement
K8AC-H2@@@-FLK
K8AC-H1@@@-FLK
Gate input
[email protected]@ [email protected]@
Current inputs
CT1
7
Voltage pulse
12 VDC or
24 VDC
CT2
8
9
10
11
7
Linear current
4 to 20 mA DC
12
8
9
1
11
10
B(+)
13
14
12
13
14
3
4
5
6
Outputs
K8AC-H2@@N
Power supply voltage
A(−)
11
2
CT1
RS-485
12
Gate input
[email protected]@ [email protected]@
Current inputs
Communications
7
Voltage pulse
12 VDC or
24 VDC
CT2
8
9
10
11
7
8
12
9
1
2
4
3
100 to 240 VAC
Terminals
1 to 2
9 to 10
6
5
6
125 VAC,
0.3 A AC
30 VDC,
1 A DC
Name
11 to 12
Gate input
13 to 14
Communications
All models
Connect to gate signal (voltage pulse).
K8AC-H@@C@
K8AC-H@@P@
Connect to host device for RS-485 communications.
All models
Output Circuits
CT Inputs (Heater Current)
Contact Outputs
A/D
conversion
8
9
4
5
6
K8AC-H1@@T
(NPN open-collector output)
Connect to a 4 to 20-mA gate signal.
CT1
3
K8AC-H@@@C (relay output)
Connect to CT2. Current input from CT2 secondary-side output.
−
+
14
K8AC-H2@@N
(transistor output)
Current Input Circuits
7
13
Applicable models
Connect to CT1. Current input from CT1 secondary-side output.
Current inputs
12
All models
Outputs an OR of the status of all alarms.
K8AC-H1@@C
COM
4
5
6
125 VAC,
0.3 A AC
30 VDC,
1 A DC
Note: 1. Terminals 4 to 6:
Alarm output
terminals. Depend
on the output type
(relay contact
output or transistor
output).
2. Terminals 11 and
12: Gate input
terminals. Depend
on the heater
control type (ONOFF/SSR control
or cyclic/phase
control).
+12 V
4
Relay
drive
circuit
COM
5 N.C. contact
6
A/D
conversion
−
+
CT2
14
11
4
5
6
12 to 24 VDC,
50 mA DC
100 to 240 VAC
Outputs SSR open or short circuit detection results.
Outputs heater burnout or layer short circuit detection results.
Outputs
B(+)
13
Outputs
2
Description
A(−)
12
COM
1
Power supply voltage Connect to the operating power supply.
5, 6 to 4
7 to 8
5
12 to 24 VDC, 12 to 24 VDC,
50 mA DC
50 mA DC
3 to 4,
5 to 6
5 to 4,
6 to 4
4
10
RS-485
K8AC-H1@@T
COM
1
11
2
Power supply voltage
K8AC-H2@@C
Communications
Linear current
4 to 20 mA DC
N.O. contact
Note: For contact outputs, the same outputs are used for SSR error
and for heater burnouts and heater layer short circuit alarm
outputs.
10
Transistor Output
K8AC-H2@@N-FLK
K8AC-H1@@T-FLK
Transistor
drive
circuit
4
Transistor
drive
circuit
6 Heater burnout,
heater layer short circuit,
5 overcurrent alarm output
SSR alarm output
4 COM
3
The transistor output of the K8AC-H2@@N uses a photocoupler for
isolation with the internal circuits, and so either an NPN opencollector output or a PNP equivalent output can be used.
NPN Output
Transistor
drive circuit
Transistor
drive circuit
5 SSR alarm output
6
Heater burnout, heater layer short
circuit, overcurrent alarm output
PNP Equivalent Output
Load
Load power supply
Load
Load power supply
7
K8AC-H
External Connection Example
Wiring Method When Using the K8AC-H with SSR Control Heaters
Operation Description
Power supply
RS-485
1
2
13
Transistor Output
K8AC-H2@@N-FLK
14
3
3
4
4
5
5
6
7
8
9
10
11
6
12
• If the heater current detected at either CT1 or CT2 falls below the
burnout alarm set value, an alarm is output. The burnout alarm set
value can be set separately for CT1 and CT2.
No burnout alarm is output, however, when the temperature controller control output is OFF.
Burnouts are detected only while the temperature controller control
output is being input to the gate input terminals (11 and 12).
Faulty outputs do not occur because heater burnout detection is
linked with the temperature controller.
• The minimum burnout detection time is 200 ms. Shorter burnouts
are not detected.
• Turn ON the voltage fluctuation compensation function (default: OFF)
to detect power supply voltage fluctuations and automatically compensate the burnout alarm value. Also, turn ON the voltage fluctuation
compensation function to detect minor current fluctuations.
Correct Usage
Temperature
Controller
(DC voltage output)
SSR
• Always take the power supply voltage from the primary side of the SSR.
• Use temperature controllers with a 12 or 24-VDC voltage output
(30 VDC max.).
• CT1 and CT2 are special products. Use the K8AC-CT@@.
• The CTs do not have polarity.
• Connect only one CT for single-phase heaters.
• Connect two CTs for three-phase heaters.
• For three-phase heaters, always set the burnout alarm set values
for both CT1 and CT2.
CT1
CT2
Heater
Wiring Method When Using the K8AC-H with ON/OFF Control Heaters
Power supply
Operation Description
RS-485
1
2
13
Transistor Output
K8AC-H2@@N-FLK
14
3
3
4
4
5
5
6
7
8
9
10
11
12
24-VDC
power supply
X
Contactor
CT1
CT2
Heater
8
6
Temperature
Controller
(relay output)
• If the heater current detected at either CT1 or CT2 falls below the
burnout alarm set value, an alarm is output. The burnout alarm set
value can be set separately for CT1 and CT2.
No burnout alarm is output, however, when the temperature controller control output is OFF.
Burnouts are detected only while the temperature controller control
output is being input to the gate input terminals (11 and 12).
Faulty outputs do not occur because heater burnout detection is
linked with the temperature controller.
• The minimum burnout detection time is 200 ms. Shorter burnouts
are not detected.
• Turn ON the voltage fluctuation compensation function (default: OFF)
to detect power supply voltage fluctuations and automatically compensate the burnout alarm value. Also, turn ON the voltage fluctuation
compensation function to detect minor current fluctuations.
Correct Usage
• Always take the power supply voltage from the primary side of the SSR.
• Use a temperature controller with relay output.
• The input to the gate input terminals (11 and 12) must be a DC voltage input, so wire the 24-VDC power supply as shown in the diagram to the left.
• CT1 and CT2 are special products. Use K8AC-CT@@.
• The CTs do not have polarity.
• Connect only one CT for single-phase heaters.
• Connect two CTs for three-phase heaters.
• For three-phase heaters, always set the burnout alarm set values
for both CT1 and CT2.
K8AC-H
Wiring Method When Using the K8AC-H with Cyclic Control Heaters
Power supply
Operation Description
5
• If the heater current detected at either CT1 or CT2 falls below the
burnout alarm set value, an alarm is output. The burnout alarm set
value can be set separately for CT1 and CT2.
No burnout alarm is output, however, when the temperature controller control output is OFF.
Burnouts are detected only while the temperature controller control output
is being input to the gate input terminals (11 and 12). Burnout is detected
with no errors because the automatic adjustment of burnout alarm level is
linked to the temperature controller control output (4 to 20 mA).
• Burnout is detected when control outputs from the temperature controller are 7 mA min.
6
Correct Usage
RS-485
1
2
13
Transistor Output
K8AC-H2@@N-FLK
14
3
3
4
4
5
6
7
SSR
SSR
8
9
10
G32A-EA
Cyclic
Control Unit
12
• Always take the power supply voltage from the primary side of the SSR.
• Use a temperature controller with a 4 to 20-mA current output.
• When you adjust the set value for the burnout alarm, make sure
that you make the setting with the temperature controller's control
output at a 100% output.
The burnout detection value is the detection value at 100% output.
Therefore, correct operation will not be possible if the setting is
made based on a measurement value when the output is not 100%.
• CT1 and CT2 are special products. Use K8AC-CT@@.
• The CTs do not have polarity.
• Connect only one CT for single-phase heaters.
• Connect two CTs for three-phase heaters.
• For three-phase heaters, always set the burnout alarm set values
for both CT1 and CT2.
11
4 to 20 mA current output
Temperature
Controller
CT1
CT2
Heater *
* Consult with your OMRON representative if multiple heaters are connected
in parallel different heater capacities, or if a heater with varying heater
resistance is used.
Wiring Method When Using the K8AC-H with Phase Control Heaters
Power supply
Operation Description
RS-485
1
2
13
Transistor Output
K8AC-H2@@N-FLK
14
3
3
4
4
5
5
6
7
Power
Regulator
8
9
10
12
6
Correct Usage
11
4 to 20 mA current output
Temperature
Controller
CT1
CT2
Heater *
• If the heater current detected at either CT1 or CT2 falls below the
burnout alarm set value, an alarm is output. The burnout alarm set
value can be set separately for CT1 and CT2.
No burnout alarm is output, however, when the temperature controller control output is OFF.
Burnouts are detected only while the temperature controller control
output is being input to the gate input terminals (11 and 12).
Burnout is detected with no errors because the automatic adjustment of burnout alarm level is linked to the temperature controller
control output (4 to 20 mA).
• Burnout is detected when control outputs from the temperature controller are 7 mA min.
* Consult with your OMRON representative if multiple heaters are connected
in parallel different heater capacities, or if a heater with varying heater
resistance is used.
• Always take the power supply voltage from the primary side of the
contactor.
• Use a temperature controller with a 4 to 20-mA current output.
• When you adjust the set value for the burnout alarm, make sure
that you make the setting with the temperature controller's control
output at a 100% output (20 mA).
The burnout detection value is the detection value at a 100% output. Therefore, correct operation will not be possible if the setting is
made based on a measurement value when the output is not 100%.
• Adjust the burnout alarm set value at a 100% output for gradient
settings as well.
• If using the soft startup function with a power regulator, set the soft
startup function on the K8AC-H as well, to prevent malfunctions.
• CT1 and CT2 are special products. Use K8AC-CT@@.
• The CTs do not have polarity.
• Connect only one CT for single-phase heaters.
• Connect two CTs for three-phase heaters.
• For three-phase heaters, always set the burnout alarm set values
for both CT1 and CT2.
• When using the power regulator's gradient settings, change the
operation gate current level so that the heater current value is
within the measurement range. (The initial value is 7 mA.)
For details on operating methods, refer to pages 16 to 18.
9
K8AC-H
Heater Connection Methods and Current
Depending on the heater connection method, the current when an error occurs will be as shown in the following table. Refer to this table when
determining burnout alarm set values.
Normal condition
Abnormal condition
0A
5A
200 V
Single-phase
200 V
1 kW
0A
5A
8.7 A
200 V
Delta
connection
200 V
200 V
200 V
Threephase
200 V
Star
connection
200 V
1 kW
8.7 A
200 V
200 V
7.5 A
8.7 A
5A
1 kW
3)
2
(5 A × 3 )
(5 A × 3 ×
2.9 A
2.5 A
2.5 A
2.5 A
2.5 A
1kW
2.9 A
(5 A × 3 ×
1)
3
1 kW
1 kW
2.9 A
1)
3
(5 A ×
8.7 A
5A
1
3)
×
3
2
(5 A ×
2.5 A
5A
200 V
5A
1 kW
8.7 A
(5 A ×
V
connection
7.5 A
1
3)
×
3
2
5A
1 kW
5A
2.5 A
1 kW
1
(5 A × 2 )
(5 A × 3 = 8.7 A)
(5 A × 1)
Note: This is the current for when a 200-V, 1-kW heater is used for single-phase or three-phase operation.
Rate of Change for Currents with Parallel Heaters
The following table shows the current change ratios when multiple heaters of the same capacity are connected in parallel and one of the heater
elements burns out. Use this table for reference when making corrections.
If five single-phase heaters are connected in parallel, the current change when burnout occurs is 20% per heater.
For example, if the current for a single heater is low and the change ratio is very slight, it may not be detected. Therefore take into account the
detection accuracy for the total current when selecting the number of heaters to be connected in parallel.
Connection
Singlephase
I
n=1
n=2
n=3
n=4
n=5
With one heater
burned out,
I is 0.
0.5
0.67
0.75
0.8
With one heater
burned out,
I is 0.
0.6
0.75
0.82
0.86
Current in other
phases
0.87
0.92
0.95
0.96
0.97
Current in lines
near burned-out
phase (Same as 2phase.)
0.58
0.77
0.84
0.88
0.91
1
1
1
1
1
n heaters
I
Star
connection
Number of
heaters per
phase = n
I
Delta
connection
Number of heaters
per phase = n
Current in burnedout phase
Current in other
phases
Note: 1. The figures in the above table show the current change ratios when burnout occurs for one heater connected in parallel.
2. The numbers represent the current ratio after one heater burns out, with the current prior to the burnout (i.e., the normal current) taken
as 1.
3. In actual operation there may be effects from factors such as load (heater) imbalances, so conduct an actual test for confirmation before
making adjustments if the current change ratio between normal and abnormal operation is slight.
4. Consult with your OMRON representative if multiple heaters are used with different heater capacities.
10
K8AC-H
Operation
Main K8AC-H Functions
The K8AC-H is a digital heater burnout detector that detects heater burnout by measuring the heater current from various power supply systems.
The K8AC-H provides the following functions.
Applicable Heater Control Methods
Error Detection
The following heater control methods can be used.
The following errors are detected according to status.
ON/OFF Control (Contactor/SSR)
Heater Layer Short Circuit Detection (overcurrent
detection).
Layer short circuits can be detected in the heater.
The preset overcurrent detection set value is compared with the
heater current and an alarm is output accordingly.
ON
OFF
1 to 99 s
Cyclic Control
Set value
Current
ON
OFF
0.2 to 3.0 s
Phase Control (Applicable to 4 to 20 mA Current-output
Temperature Controllers)
Alarm
Transistor output models: ALM indicator lit, ALM transistor output
Relay output models: ALM indicator lit, OR of all detection status output
SSR Short Circuit Detection
OFF
If current is measured when there is no gate input, an SSR short
circuit error is detected and an alarm is output.
ON
Half cycle
Gate input
Heater Burnout Alarm
The preset burnout detection value is compared with the heater
current and an alarm is output accordingly.
Current
Current
measurement
Set value
500 ms
100 ms
Alarm
Transistor output models: SSR indicator lit, SSR transistor output
Relay output models: SSR indicator lit, OR of all detection status output
SSR Open Circuit Detection
Alarm
Transistor output models: ALM indicator lit, ALM transistor output
Relay output models: ALM indicator lit, OR of all detection status output
If current is not measured during gate input, an SSR open circuit error
is detected and an alarm is output.
Gate input
Current
measurement
Alarm
Transistor output models: SSR indicator lit, SSR transistor output
Relay output models: SSR indicator lit, OR of all detection status output
11
K8AC-H
Voltage Fluctuation Compensation
Using the Power Regulator's Gradient Settings
The voltage fluctuation compensation function automatically adjusts
the burnout alarm value of the K8AC-H according to voltage
fluctuations in the heater circuit.
The operating value for burnout detection when multiple heaters are
connected is set very close to the normal value. Thus, a false burnout
alarm output will occur if there is a voltage drop in the heater circuit.
The voltage fluctuation compensation function prevents this type of
false output.
Example: Voltage Drop from 100 V to 95 V in the Heater Circuit
Conditions:
Voltage fluctuation compensation standard value = 100 V
Burnout alarm set value = 10.0 A
If the power supply voltage drops from 100% to 95%, the
operating value will also reduced from 100% to 95%.
Burnout alarm operating value = 10.0 A × 95% = 9.5 A
The power regulator's gradient settings can be used to prevent
malfunction by setting the operation gate current level. The
relationship between the gradient settings and output current
depends on the power regulator manufacturer and model, so be sure
to check the characteristics of the power regulator being used before
setting.
Setting Example
Initial setting: 7 mA
Output current
100%
Gradient
setting 100%
Measurement range
0%
Gate Input
The gate input provides a sync signal used to link burnout detection
to the control output of the temperature controller.
For SSR control, the voltage output pulse from the temperature
controller is input.
For ON/OFF control, 24 VDC linked to a relay contact of the
temperature controller is input.
For cyclic or phase control, a 4 to 20-mA control signal is input.
If there is no gate input for a Heater Element Burnout Detector, a
heater burnout alarm would be falsely output when the voltage output
pulse from the temperature controller turns OFF, and there would be
no way to tell whether it was a false output.
Note: The gate input function can be disabled. If it is disabled, Heater
Element Burnout Detector operation will not be linked to the
temperature controller control signal. (The gate input can be
used as a simple undercurrent relay.)
Control signal
4 mA 7 mA
Not detected
Output current
100%
Power Save Mode
Standby Time
Output Operation Time Charts
Heater Burnout and Heater Layer Short Circuit
(Overcurrent) Alarms
Alarm hysteresis
Heater layer short circuits
Overcurrent set value
Heater current
20 mA
Gradient
setting 100%
Measurement range
Gradient
setting 50%
0%
Control signal
4 mA
14 mA
Not detected
Power-saving Operation
If there are no key operations performed within a preset time period,
the display automatically turns OFF.
Detected
When the power regulator's gradient settings are changed, the
operation gate current level is set so that the output current is within
the measurement range. (In the following diagram, 14 mA is set.)
20 mA
Detected
Using Halogen or Other Heaters with Varying
Resistance during Phase and Cyclic Control
When phase control is used with halogen heaters or other pure metal
heaters, the heater resistance fluctuates according to the control
level. As a result, high-precision detection of heater burnout is not
possible. The effect on the heater and setting methods depends on
the heater being used. Therefore, consult with your OMRON
representative before using a heater with varying resistance values.
Halogen Heater Resistance Fluctuation Example
In the following example, burnout of one element in a six-element
heater can be detected at a control level of 20 mA, but detection is not
possible due to the effect of fluctuating resistance if the control level
is any lower.
Heater resistance
Heater burnout set value
Three elements
burned out
8Ω
Detectable range
Alarm output
ALM indicator lights. ALM indicator lights.
SSR Short/Open Circuit Alarm
6Ω
4Ω
SSR short-circuit
One element
burned out
Threshold
2Ω
SSR open-circuit
Normal
(six elements in parallel)
Alarm output
SSR indicator lights. SSR indicator lights.
12
0Ω
4 mA
7 mA
20 mA
Control signal
K8AC-H
Nomenclature
Nomenclature and Operations
K8AC-H2@@@-FLK
K8AC-H1@@@-FLK
Name
Operation
Displays processing values, parameter characters,
and set values.
Main display
Operation
indicators
Main display
area
Shift key
Operation
indicators
Up key
Mode key
RUN (Measurement
operation)
Lights when the power is turned ON and the
measurement operation is in progress.
OFF at all other times.
ADJ
(Adjust)
Lights while in Adjust Mode.
Flashes while in Test Mode.
OFF at all other times.
SET (Set)
Lights while in Set Mode.
OFF at all other times.
GATE
(Gate)
Lights or turns OFF according to gate input status.
Gate pulse:
Lights for high voltage pulse; OFF for low
voltage pulse.
Gate signal (4 to 20 mA):
Lights for 4 mA or over; OFF for less than 4 mA.
SSR
(SSR error)
*
Lights when an SSR error occurs (open or short
circuit).
OFF when SSR is normal.
ALM
(Alarm) *
Lights for heater burnout or overcurrent.
OFF at all other times.
Down key
Level key
Up key
Increments a set value when the set value is in
change status.
Down key
Decrements a set value when the set value is in
change status.
Shift key
Used to check set values while parameters are
displayed, and to put set values in change status.
Used to shift the set value digit when the set value is
in change status.
Mode key
Used to switch the displayed parameter.
Level key
Used to change the level.
* Check the specific status using the alarm display parameters on the
main display.
Alarm Indicator
Processing Value Display Ranges and Functions
s
Order
of
priority
Alarm
7-segment
display
characters
LED
indicator
Alarm contents
1
Heater burnout 1
hbt1
ALM
indicator lit
CT1 heater
burnout detected.
hbt2
ALM
indicator lit
CT2 heater
burnout detected.
SSR
indicator lit
SSR open circuit
detected (when
heater current
cannot be
detected with
temperature
control gate
output ON).
2
3
Heater burnout 2
SSR open circuit
ssro
4
SSR short circuit
ssrs
SSR
indicator lit
SSR short circuit
detected (when
heater current is
detected with
temperature
control gate
output OFF).
5
Heater layer
short circuit 1
hrs1
ALM
indicator lit
CT1 overcurrent
detected.
6
Heater layer
short circuit 2
hrs2
ALM
indicator lit
CT2 overcurrent
detected.
Processing
value name
Heater 1
current
Heater 2
current
Display
characters
Display
range
ct 1
0100 to
2300
*1
*2
ct 2
0100 to
2300
*1
*2
Unit
Function
A
This is the CT1 heater
current processing value.
Alarm operations such as
the heater burnout alarm
are determined based on
this processing value.
A
This is the CT2 heater
current processing value.
Alarm operations such as
the heater burnout alarm
are determined based on
this processing value.
*1. The decimal point position depends on the input type.
[email protected]@@: 0.100 to 2.300
[email protected]@@: 1.00 to 23.00
[email protected]@@: 10.0 to 210.0
*2. If the display is below 0100, the bar display “----” will be shown.
Note: 1. As soon as the cause of an alarm is removed, the alarm is
reset automatically.
2. If multiple alarms occur simultaneously, the one with the
highest priority is displayed.
3. If the mode is changed to Adjust or Set Mode while an alarm
is in effect, the alarm output is reset and the ALM and SSR
indicators turn OFF.
13
K8AC-H
Settings Method
Settings Methods for SSR and ON/OFF Control Heaters
Settings Conditions
K8AC-H Parameter Setting Procedure
Detecting burnouts in just one heater when ten 300-W rated heaters
are connected in parallel to a single-phase 200-V power supply.
The heater is SSR controlled.
(Only the minimum settings are shown here. Refer to pages 16 to
18 for information on how to set parameters.)
1. Turn ON the power to the K8AC-H. The initial status when power
is turned ON is called Run Mode.
2. Press the L Key for at least 3 s to change from Run Mode to
Adjust Mode (the mode for adjusting burnout alarm set values.)
3. Set the burnout alarm set values. (AL-1 = CT1 burnout alarm set
value and AL-2 = CT2 burnout alarm set value.)
Set “14.3” to AL-1.
Set the AL-2 burnout alarm set value to “----” so that it will not
detect heater burnout, because this is a single-phase heater.
4. Change to Run Mode.
Press the L Key while in Adjust Mode for at least 1 s to change
to Run Mode.
5. Check operation.
Test heater burnout detection by burning out one heater.
Also check that there are no malfunctions during temperature
control.
Note: The default setting for functions including the voltage
fluctuation compensation function, alarm hysteresis, output
ON-delay time, and SSR error detection function is OFF. Turn
ON any of these functions as required.
Normal Heater Current and Heater Current with One
Heater Element Burnout
Normal current = (300 W × 10 (heaters))/200 V = 15.0 A
Current with one burnout = (300 W × 9)/200 V = 13.5 A
Heater burnout alarm set value =
(Normal current + current at malfunction) 15.0 + 13.5
=
= 14.3 A
2
2
Selecting Heater Element Burnout Detector Models
For the above example, K8AC-H12C@-FLK would be selected.
The burnout alarm set value is 14.3 A, so the current input range 2.00
to 22.00 A should be selected.
SSR control is used, so type C should be selected. (Type C is also
selected for ON/OFF control.)
Select the appropriate relay or transistor output specifications,
depending on the application.
Settings Method for Cyclic and Phase Control Heaters
Settings Conditions
Detecting burnouts in one heater when five 1,000 W-rated heaters are
connected to each phase of a three-phase delta-connected 200-V
power supply.
A power regulator (phase control) performs heater control.
Normal Heater Current and Heater Current With One
Heater Element Burnout
Example: When One of Five Single-phase Heaters (R-S) Burns
Out
Normal current = 3 (1,000 W × 5 (heaters))/200 V = 43.3 A
Current with one burnout = 43.3 A × 0.91 = 39.4 A
(Refer to Rate of Change for Currents with Parallel Heaters on
page 10.)
Heater burnout alarm set value =
Normal current + current at malfunction 43.3 + 39.4
=
= 41.4 A
2
2
Selecting Heater Element Burnout Detector Models
For the above example, K8AC-H13P@-FLK would be selected.
The burnout alarm set value is 41.4 A, so the current input range 20.0
to 200.0 A should be selected.
Phase control is used, so type P should be selected. (Type P is also
selected for cyclic control.)
Select the appropriate relay or transistor output specifications,
depending on the application.
K8AC-H Parameter Settings Procedure
(Only the minimum settings are shown here. Refer to pages 16 to
18 for information on how to set parameters.)
1. Turn ON the power to the K8AC-H. The initial status when power
is turned ON is called Run Mode.
2. Press the L Key for at least 3 s to change from Run Mode to
Adjust Mode (the mode for adjusting burnout alarm set values.)
3. Change from Adjust Mode to Set Mode (the default settings mode
for all functions). The password “0169” is required to move to Set
Mode.
4. Set the heater control method parameter to PH-3 (three-phase
control).
The default setting is PH-1 (single-phase control).
Note: Set the parameter to CYCL (cyclic control) when using
cyclic control.
5. Press the L Key for at least 1 s to change from Set Mode to Adjust
Mode. Press the L Key again for at least 1 s to change from
Adjust Mode to Run Mode.
Note: The default setting for functions including the voltage
fluctuation compensation function, alarm hysteresis, output
14
ON-delay time, and SSR error detection function is OFF. Turn
ON any of these functions as required.
Burnout Alarm Set Value Setting Method
Setting Method
• Wire the K8AC-H, temperature controller (4 to 20 mA current
output type), and power regulator (phase control).
• Press the L Key on the K8AC-H for at least 3 s to change from
Run Mode to Adjust Mode.
• AL-1 (CT1 burnout alarm set value) will be displayed when the
mode is changed to Adjust Mode. Press the S key once when AL1 is displayed. Next, press the U Key once. The present heater
current value will be displayed on the main display, so note this as
the normal current value. Always have the temperature controller
output at 20.0 mA at this time (See note 1.)
• Next, disconnect one heater and note the heater current in this
burnout state. Alternatively, use the current when one heater is
burned out (calculated earlier) as the current during malfunction. It
is recommended that the current at an actual burnout is confirmed.
• Set the K8AC-H burnout alarm set value based on the results. The
burnout alarm set value is set at the mid-point between the normal
current and the current at malfunction, taking errors and variations
in heater capacity into consideration.
• In this setting example, the set value for AL-2 (CT2 burnout alarm
setting) is the same as the set value for AL-1. (See note 2.)
Note: 1. The K8AC-H automatically adjusts burnout alarm levels to
compensate based on the temperature controller current
output. The burnout alarm value must be set when the
temperature controller output is at 100% (20 mA), so be
sure to have the temperature controller at 20 mA output.
2. If the heater capacity is unbalanced, the burnout alarm
values for CT1 and CT2 may not be the same.
K8AC-H
Measurement Monitor Value Display Ranges and Functions
Other than measuring the heater current, the K8AC-H can measure the power supply voltage, maximum/minimum current, maximum/minimum
voltage, and other values. The measurement data can be monitored from a host using RS-485 communications. The measurement monitor value
names, display ranges, and functions are given in the following table.
Measurement monitor
value name
Display characters
Display range
Unit
Function
sce
0085 to 0264
V
This is the measurement value of the K8AC-H power supply voltage. When the voltage
fluctuation compensation function is enabled, the heater burnout determination based on
this voltage is automatically compensated.
Heater 1 maximum current
*
max1
0100 to 2300
A
Heater 1 minimum current
*
min1
0100 to 2300
A
Heater 2 maximum current
*
max2
0100 to 2300
A
Heater 2 minimum current
*
min2
0100 to 2300
A
Maximum power supply
voltage *
maxs
0085 to 0264
V
Minimum power supply
voltage *
mins
0085 to 0264
V
Power supply voltage
Number of alarm outputs
acnt
0000 to 9999
Outputs
Processing value for alarm
output
memo
0100 to 2300
A
These hold the maximum and minimum values for each processing value.
• The maximum and minimum heater currents after the power is turned ON or after a
maximum or minimum reset are displayed.
• The values are not saved when power is interrupted.
• The current values are not refreshed when startup lock is in effect and when the gate
input is enabled but the gate input is OFF.
• Measurement values for power supply voltages are always refreshed.
This value counts the total number of alarms output for heater burnout, SSR open and
short circuits, and heater layer shorts.
• The count is refreshed each time an alarm is output, and it is saved in non-volatile
memory.
• The value is saved when power is interrupted.
• The number of outputs is not counted for the test function.
This holds the CT1 or CT2 processing value when a heater burnout alarm is output.
• This is the most recent processing value, and it is refreshed each time a heater
burnout alarm occurs.
• The value is not saved when power is interrupted.
This is the total run time value from when power is turned ON or the processing value is
reset until an alarm occurs.
• The total time is recorded in non-volatile memory approximately once per hour. If
power is interrupted within the hour, however, the data since the beginning of the hour
is lost and the total starts over from when the time was last saved.
• The total is stopped during heater burnout alarm output. When the alarm is cleared,
the total resumes from the time just before the alarm occurred.
Run time
otim
0000 to 9999
× 10h
Heater 1 input shift display
current
isc1
−999 to 999
digit
This is the shift value for displaying the CT1 heater current measurement set in
measurement parameter CT1.
• The value is saved when power is interrupted.
Heater 2 input shift display
current
isc2
−999 to 999
digit
This is the shift value for displaying the CT2 heater current measurement set in
measurement parameter CT2.
• The value is saved when power is interrupted.
* Each measurement value can be individually reset. Refer to the K8AC-H Digital Heater Element Burnout Detector User’s Manual (Cat. No. N132)
for operating procedures.
Modes
Groups of setting items are called “modes.” The K8AC-H has five modes.
Mode
Function
Alarm operation
Run Mode
This is the normal operating mode, used for receiving inputs, executing heater burnout outputs, etc.
Operation goes into Run Mode immediately after power is turned ON.
Executed
Adjust Mode
This mode is used to change comparatively frequently set parameters, such as alarm value settings.
This also the mode for entering the password to move to the Set Mode.
Stopped
Set Mode
This mode is used to make the initial settings for the various functions.
Stopped
Protection Settings
Mode
This mode is used to make settings to prevent unintended key operations. The protected modes are not displayed,
preventing changes to set values.
Stopped
Test Mode
This mode is used to simulate inputs with key operations to test alarm outputs.
Executed
Gate Mode
This mode sets the gate current value that stops an alarm or detection.
Executed
Note: If more than five minutes elapses with no operations performed in the Protection Settings Mode, Adjust Mode, or Set Mode, the status will
return automatically to the processing value display. If this occurs while settings are in progress, it may cause unintended operations in the
processing value display. Be careful not to allow this to happen.
Settings Data Notation
The letters of the alphabet in settings data are displayed as shown below.
a b c d e f g h i j k l m n o p q r s t u V w x y z
A B C D E F G H
I
J K L M N O P Q R S T U V W X Y Z
15
K8AC-H
Operating Procedures
Moving between Modes
To Gate Mode
Press the D
key for at least 1 s. Gate Mode
Power ON
Press the S
key for at least 1 s.
keys.
1234
Press the L
and M keys for
Press the D
key for at least 1 s.
Press the
L and M
Run Mode
Test Mode
Press the S
When the
key is
released
key for at least 1 s.
Press the L key
When the key
is released
5 s.
Protection
Settings Mode Press the
L and M
keys for at
least 1 s.
1234
Press the
L key for
at least 1s.
Adjust Mode
Press the L key
for at least 1s.
for at least 1 s.
Hold down for at
least another 2 s.
When the D key is pressed for at least one second in Run Mode, the
mode will be switched to Gate Mode. To return to Run Mode from
Gate Mode, press the D key for at least one second.
To Test Mode
When the S key is pressed for at least one second in Run Mode, the
mode will be switched to Test Mode. To return to Run Mode from Test
Mode, press the S key for at least one second.
To Set Mode (Password Input)
A special operation is required to move to the Set Mode.
Use the following procedure.
Procedure
A. Move to the Adjust Mode and use the M key to
display the parameter for moving to the Set Mode.
amoV
Password: 0169
· The parameter characters are "amoV".
0
Set Mode
B. Press the S key to display the set value
(password).
To Adjust Mode
When the L key is pressed for one second in Run Mode, the 7segment display will begin to flash. If the key is held down for another
two seconds, the mode will be switched to Adjust Mode.
To return to Run Mode from Adjust Mode, press the L key for at least
one second.
0000
C. Press the S key again to enable changing
the password.
0169
D. Use U, D, and S keys to set the password.
The password is 0169.
· Press the M key.
· If the password is correct, the mode will change to
the Set Mode.
· If the password is incorrect, the next parameter will
be displayed while still in Adjust Mode.
To Protection Settings Mode
When the L and M keys are pressed for one second in Run Mode,
the 7-segment display will begin to flash. If the keys are held down for
another five seconds, the mode will be switched to Protection Settings
Mode. To return to Run Mode from Protection Settings Mode, press
L and M keys for at least one second.
amoV
S
0
S
M
M
0000
S
When password
is incorrect
Next parameter
in Adjust Mode
0169
M
M
Set Mode
When password
is correct
init
Setting the Parameter
The value set for each parameter is called the “set value.” Set values
include both numbers and characters.
The status when a set value is displayed is called “monitor status,”
and when it can be changed it is called “change status.”
Use the following procedure to display and change set values.
Procedure
A. Press the S key while a parameter is displayed to
go into monitor status. The set value for that
parameter will be displayed.
Note:
If a set value is out of
range, either too high or too
low, the maximum or
minimum value will
automatically be set. For
models with a current input
of 0.200 to 2.200 A, for
example, the maximum
value is 2.200 and the
minimum value is 0.200.
B. If the set value is not to be changed, press the M
key while in monitor status to switch to the next
parameter.
C. Press the S key again while in monitor status to
enable the changing set value.
· The place where the set value can be changed will
begin to flash.
D. Use the S, U, and D keys to change the set
value.
E. Press the M key to save the changed set value in
internal memory and switch to the next parameter.
· Changed set values will not be saved in memory if
the mode is changed by another key operation
without first pressing the M key.
M
al-1
Monitor status
S
M
To next parameter
16
2000
M
S
Change status
2000
M Use the S, U, and
D keys to change
the set value.
K8AC-H
Parameter List
The setting items in each mode are called “parameters.”
Parameters can be switched by using the M key.
Protection Mode
*3
Adjust Mode
aspt
al-1
al-2
Power ON
Setting change protection
1 s min.
amoV
Run Mode
1 s min.
1234
(Processing value
display status)
All initialization
*1
Password for
moving to Set
Mode: 0169
Display mode
Set value initialization
pini
Processing value
initialization
isc2
isc1
otim
memo
acnt
min5
sce
Heater 2 input shift
display current
1 s min.
Power supply voltage
measurement value
max1
Heater 1 input shift
display current
Voltage fluctuation
compensation standard value
test
Startup lock time
An alarm is output if
the test value falls
below the burnout
alarm value 1 setting.
Heater 1
maximum current
odly
Processing value
for alarm output
Number of
alarm outputs
Minimum power
supply voltage
max2
Heater 2
maximum current
min2
Heater 2
minimum current
1 s min.
1 s min.
*2
g-lV
Alarm or detection is
stopped if the gate
current value falls
below the set value.
maxs
Maximum power
supply voltage
*3
ssht
sopn
*4
nct 1
SSR short circuit
detection function
SSR open circuit
detection function
hral
*2
Heater control
method
psmd
pstm
ndp 1
Setting 1 for number of
effective digits to be displayed
after the decimal point
Number of
CT passes 2
ctr 2
CT ratio 2
Heater layer short circuit
alarm set value
Parameter Display
CT ratio 1
nct 2
Heater layer short circuit
detection function
dsel
Number of
CT passes 1
ctr 1
hrst
msmd
: Displayed for all models and settings.
: May not be displayed depending on the model or settings.
goh t
Parity bit
Output ON-delay time
Soft startup time
Gate Mode
prt y
Gate OFF
output hold time
soft
Heater 1
minimum current
sbi t
stim
min1
RUN time
Measurement
parameters
1 s min.
le n
Stop bits
comp
Test Mode
bp s
Data length
Gate input function
Heater 2 current
u no
Baud rate
hys2
gate
ct 2
Display
refresh time
Unit number
Alarm hysteresis 1
3 s min.
Heater 1 current
dsr f
hys1
Alarm hysteresis 2
ct 1
dsm d
sini
1 s min.
Voltage fluctuation
compensation standard value
5 s min.
init
Burnout alarm
setting value 2
VfcV
*3
Set Mode
Burnout alarm
setting value 1
Setting change protection
wtpt
*3
Switchable
display
ndp 2
Setting 2 for number of
effective digits to be displayed
after the decimal point
Note:
Displayed only for
the K8AC-H2@@@.
sdl y
SSR ON delay
Power save
mode
Power save
mode standby
time
sgl V
SSR operation
gate current level
cyc t
Cycle time
*1. Displayed when the Selectable Protection Level parameter is set to 0.
*2. Displayed by the K8AC-H@@P@-FLK.
*3. If more than five minutes elapses with no operations performed in Protection Settings Mode, Adjust Mode, Set Mode, or for a measurement
parameter, the status will return automatically to the processing value display.
If this occurs while settings are in progress, it may cause unintended operations to be performed in Run Mode (i.e., with measurement values
displayed). Be careful not to allow this to happen.
*4. Displayed by the K8AC-H@@C@-FLK.
17
K8AC-H
Parameter Defaults and Descriptions
Item
Mode
Protection
Mode
Adjust
Mode
Parameter name
Setting Change Protection
Setting Value Change
Prohibition
[email protected]
Burnout Alarm
[email protected]
Value 1
[email protected]
[email protected]
Burnout Alarm
[email protected]
Value 2
[email protected]
Voltage Fluctuation
Compensation Standard Value
All Initialization
Note:
Shaded parameters must always be set regardless of the
measurement method.
Description
0 to 2
0
Prohibits changes to set values.
wtpt
ON/OFF
OFF
Sets the output operation value for the burnout alarm.
The burnout alarm function can be disabled by setting the set value to
“−”.
al-1
Sets the output operation value for the burnout alarm.
The burnout alarm function can be disabled by setting the set value to
“−”.
al-2
0.200 to 2.200 A
2.00 to 22.00 A
20.0 to 200.0 A
0.200 to 2.200 A
2.00 to 22.00 A
20.0 to 200.0 A
1.000 A
10.00 A
100.0 A
1.000 A
10.00A
100.0 A
vfcv
100 to 240 VAC
100 V
init
ON/OFF
OFF
sini
pini
ON/OFF
OFF
ON/OFF
OFF
hys1
1 to 999
10
hys2
1 to 999
10
gate
ON/OFF
ON
Sets the standard voltage used by the voltage fluctuation
compensation function. The fluctuation compensation function
operates in respect to this set value.
Returns all set values and measurement values to their default
settings.
Processing Value Initialization
Returns all measurement values to their default settings.
Gate Input Function
Sets hysteresis for the alarm output value for burnout detection
(undercurrent) and heater layer short circuits (overcurrent) for CT1.
Sets hysteresis for the alarm output value for burnout detection
(undercurrent) and heater layer short circuits (overcurrent) for CT2.
Turns the gate input function ON and OFF. If the gate input is turned
OFF, application as a simple ammeter is possible.
Voltage Fluctuation
Compensation Reference Value
Turns the voltage fluctuation compensation function ON and OFF.
comp
ON/OFF
OFF
Startup Lock Time
Sets the lock time for the startup lock.
0 (OFF)
Sets the output delay time. Set this parameter to set the operating time.
stim
odly
0 (OFF) to 255 s
Output ON-Delay
0.0 (OFF) to 99.9 s
0.0 (OFF)
Soft Startup Time
Sets the soft startup time. Set this parameter only when using a soft
start function with the power regulator.
soft
0.0 (OFF) to 99.9 s
0.0 (OFF)
ssht
sopn
ON/OFF
OFF
ON/OFF
OFF
SSR Short Circuit Detection
Turns the SSR short circuit detection function ON and OFF.
SSR Open Circuit Detection
Turns the SSR open circuit detection function ON and OFF.
Heater Layer Short Circuit
Detection (Overcurrent
Detection)
Heater Layer Short [email protected]
Circuit Alarm Level [email protected]
(Overcurrent Alarm
[email protected]
Set Value)
Turns the heater layer short circuit (overcurrent) detection function ON
and OFF.
hrst
ON/OFF
OFF
Sets the operating level for heater layer short circuit (overcurrent)
alarms.
The heater layer short circuit alarm level is the same for both CT1 and
CT2.
hral
0.200 to 2.200 A
2.00 to 22.00 A
2.000 A
20.00 A
20.0 to 200.0 A
200.0 A
Heater Control Method *1
Sets the control method of the cyclic/phase control heater.
Set Mode Switchable Display
Power Save Mode
Sets the CT for which to normally display the current.
Turns entering the power save mode ON and OFF.
Power Save Mode Standby Time Sets the time to enter power save mode.
Display Mode
Sets a 7-segment (NORM). full-span comparison (CMP), or bar (BAR)
display.
Display Refresh Time
Sets the refresh time for the display.
Unit Number
Sets the unit number for RS-485 communications.
Baud Rate
Sets the baud rate for RS-485 communications.
Data Length
Sets the data length for RS-485 communications.
Stop Bits
Sets the number of stop bits for RS-485 communications.
Parity Bit
Sets the parity for RS-485 communications.
Gate OFF output hold time *2
Number of CT passes 1
CT Ratio 1
18
Default
aspt
Returns all set values to their default settings.
Alarm Hysteresis 2
Setting range
Restricts access to Adjust Mode or Set Mode from Run Mode.
0: Access enabled to both Adjust Mode and Set Mode.
1: Access enabled to Adjust Mode and disabled to Set Mode.
2: Access disabled to both Adjust Mode and Set Mode.
Set Value Initialization
Alarm Hysteresis 1
Parameter
Sets the time from when the gate signal goes OFF until the burnout
alarm output turns OFF.
Sets the number of times the conductor for CT1 is passed through the
current transformer.
Sets the CT ratio for CT1.
msmd
dsel
psmd
pstm
PH1, PH3, CYCL
PH1
CT1, CT2
CT1
ON/OFF
OFF
10 to 300 s
60 s
dsmd
NORM, CMP, BAR
NORM
dsrf
u no
0.2 s, 0.5 s, 1.0 s, FAST 0.5 s
0 to 64
0
1200, 2400, 4800, 9600,
19200
9600
len
sbit
prty
7, 8
7
dps
1, 2
2
EVEN, ODD, NONE
EVEN
goht
0 to 999 s
2s
nct1
1 to 99 times
1 time
ctr1
1 to 999
1
Setting 1 for number of effective
digits to be displayed after the
decimal point
Sets the number of effective digits to be displayed after the decimal
point for the CT1 current display.
ndp1
0 to 3 places
Depends
on the
model.
Number of CT passes 2
Sets the number of times the conductor for CT2 is passed through the
current transformer.
nct2
1 to 99 times
1 time
CT Ratio 2
Sets the CT ratio for CT2.
ctr2
1 to 999
1
Setting 2 for number of effective
digits to be displayed after the
decimal point.
Sets the number of effective digits to be displayed after the decimal
point for the CT2 current display.
0 to 3 places
Depends
on the
model.
ndp2
K8AC-H
Item
Mode
Parameter name
SSR ON delay
Set Mode
SSR operation gate current level
Cycle time *3
Parameter
Description
Sets the SSR ON-delay time.
Sets the gate current level for SSR operation.
(This setting is valid only when cyclic or phase control is selected as
the heater control method.)
Sets the cycle time.
(This setting is valid only when cyclic control is selected as the heater
control method.)
Gate
Gate Current Level *1
Sets the gate current value that stops an alarm, detection, or output.
Mode
*1. Displayed by the K8AC-H@@P@-FLK.
*2. Displayed by the K8AC-H@@C@-FLK.
*3. You must restart the K8AC after you change the setting of the cycle time.
Setting range
Default
sdly
0.0 (OFF) to 99.9 s
0.2 s
sglv
4.0 to 20 mA
7.0 mA
cyct
0.2 to 3.0 s
0.2 s
g-lv
7.0 to 20.0 mA
7.0 mA
Dimensions
(Unit: mm)
Digital Heater Element Burnout Detectors
K8AC-H2@@@-FLK
35
2.1
100
To remove a wire, insert the recommended flat-blade screwdriver straight
into the hole under the push-in terminal
of the wire to enable easily remove it.
90
4.5
1.7
6
K8AC-H1@@@-FLK
35
100
90
Recommended Tools
Recommended Flat-blade Screwdriver
Manufacturer: Phoenix Contact
Model number: SZF0.4 × 2.5
Recommended Crimp Terminals
Terminals
Recommended
wire gauge
M3 crimp terminals (Width: 5.8 mm max.)
Crimper for Bar Terminals (Crimping Tool)
Manufacturer: Phoenix Contact
Model number: CRIMPF0X UD6
Recommended power line diameters: AWG10 to AWG24
Recommended crimp terminals
5.8 mm max.
1 and 2
AWG16 to
AWG18
5.8 mm max.
3 to 14
M2 bar terminals: Al 0.34-8TQ (Phoenix Contact)
AWG22
M2 bar terminals: Al 0.5-8WH (Phoenix Contact)
AWG20
M2 bar terminals: Al 0.75-8GY (Phoenix Contact)
AWG18
Note: Securely tighten the terminal screws to the following torque:
Power supply terminals: 0.5 N·m
I/O terminals:
0.23 N·m
19
K8AC-H
Optional Parts (Sold Separately)
Current Transformer
K8AC-CT20S
15
1.2 dia. 2.8
0.5
7
5.5
5.8 dia.
25
10.5
21
2.5
Two, 3.5 dia.
10
30
40
Current Transformer
K8AC-CT20L
Accessories with K8AC-CT20L: Connection Example
Contact
Contact
2.36 dia.
30
9
Plug
Approx. 3 dia.
Lead
40
18
12 dia.
15
40
Plug
Two, M3
Depth: 4 max.
Approx. 6 dia.
(22)
15
5
30
30
Current Transformer
K8AC-CT200 (Pre-wired Leads)
5
100
40
12 dia.
15
40
Two, M3
Depth: 4 max.
15
5
Current Transformer
K8AC-CT200L
30
9.3
9.3
1.7
1.7
11
4.7
63
54
Four, M4 × 6 screws
50
8.5
20
17
Mounting Hole Dimensions
13.5
Two, M5 screw holes
or two, 5.5-dia. holes
34.5
81.5
76
33.5
6
14.5
57
86
30 dia.
14.5
5.2
10
10
20
1.8
4.1
20
76
5.9
Note: Wire only the K and L terminals to the K8AC-H.
Leave the Kt and Lt terminals open.
K8AC-H
Safety Precautions
Precautions for Safe Use
The following precautions are essential to ensure safety. Always heed
these precautions.
1. Do not use or store the Product in the following locations.
• Outdoors or in locations subject to direct sunlight, wind, or rain
• Locations subject to dust, metal powder, or corrosive gases (in
particular, sulfuric or ammonia gas)
• Locations subject to static electricity or noise
• Locations subject to flooding or exposure to oil
2. Use DIN Track for installation and mount the Product in the correct
direction.
3. Do not touch the terminals when power is being supplied. Electric
shock may occasionally occur.
4. Be sure you understand the contents of the Instruction Sheet and
User’s Manual and handle the Product according to the
instructions provided.
5. Check all terminal numbers and polarity when wiring and wire all
connections correctly.
6. Tighten terminal screws to the following torque.
Power supply terminals: 0.5 N·m
7. Use the Product within the specified temperature and humidity
ranges.
8. Do not use the product in locations subject to flammable or
explosive gases. Explosions may occasionally occur if the product
is used in such locations.
9. Do not install the Product in any way that would place a load on it.
10.Use the Current Transformer specified by OMRON.
11.Install an external switch or circuit breaker that complies with
applicable IEC60947-1 and IEC60947-3 requirements and label it
clearly so that the operator can quickly turn OFF the power.
12.The product must be handled by personnel who have knowledge
of electrical systems.
Precautions for Correct Use
The following precautions are essential to ensure correct use. Always
heed these precautions.
1. Do not use the product in the following locations.
• Places subject to radiant heat from heat generating devices.
• Places subject to vibrations or physical shocks.
2. Make sure to use setting values appropriate for the controlled
object. Failure to do so can cause unintended operation, and may
result in accident or corruption of the product.
3. Do not use thinner or similar solvent for cleaning. Use commercial
alcohol.
4. When discarding, properly dispose of the product as industrial
waste.
5. To measure correct values, perform aging for approximately 15
minutes.
6. Only use this product within a board whose structure allows no
possibility for fire to escape.
Installation
1. When wiring, use only recommended crimp terminals.
2. Do not block areas around the product for proper dissipation of
heat. (If you do not secure space for heat dissipation, life cycle of
the product will be compromised.)
Mounting the K8AC-H
• Pull down the hook on the bottom of the K8AC-H, and then catch
the hook on the top of the K8AC-H onto the DIN Track and press
the K8AC-H onto the DIN Track until it locks into place.
Removing the K8AC-H
• Pull down on the hook with a flat-blade screwdriver and lift up on
the K8AC-H.
Noise Countermeasures
1. Do not install the product near devices generating strong high
frequency waves or surges.
2. When using a noise filter, check the voltage and current and install
it as close to the product as possible.
3. In order to prevent inductive noise, wire the lines connected to the
product separately from power lines carrying high voltages or
currents. Do not wire in parallel with or on the same cable as power
lines.
Other measures for reducing noise include running lines along
separate ducts and using shield lines.
Wiring
• Do not touch terminals or perform wiring while power is supplied to
the product. Doing so may result in injury or malfunction.
• Wire to the correct terminal number. Incorrect wiring may result in
damage to or burning of components.
Wiring the Push-in Terminals
• Directly insert the ferrule in the hole of the terminal to be wired.
7 8 9 10
11 12 13 14
RUN ADJ SET
GATE SSR ALM
8. 8. 8. 8.
Removing Wires from the Push-in Terminals
• Insert the recommended flat-blade screwdriver straight into the
hole to pull out the wire.
7 8 9 10
11 12 13 14
RUN ADJ SET
GATE SSR ALM
8. 8. 8. 8.
U
21
K8AC-H
Q&A
Q
Why does the current measured by the K8AC-H decrease
during cyclic or phase control?
To enable measuring the current accurately for the heater
control value, the K8AC-H@@P@-FLK uses the current input
waveform from a gate input and the Current Transformer to
compensate the measured current value and burnout alarm
value. The compensated current value is displayed, so it
appears as if the measured current is lower during cyclic or
phase control, but the K8AC-H@@P@-FLK is operating
correctly.
Q
How do I set the burnout detection alarm of the K8ACH@@P@-FLK when phase control is used?
Heater current
Set the burnout alarm value of the K8AC-H@@P@-FLK based
on the current measurement value with the heater output at
100%. (This is because the burnout detection alarm of the
K8AC-H@@P@-FLK depends on the control input.)
When you set the burnout alarm value, make sure that you
make the setting based on the current measurement value
when the control of the power regulator is 100% or the rated
voltage is applied to the heater.
Heater current
Heater burnout
alarm value
Heater Burnout Alarm Value
The heater burnout alarm value shifts
according to the control input (4 to
20 mA) from the temperature controller.
20 mA
4 mA 7 mA
Control output from temperature controller
22
Warranty and Application Considerations
Warranty and Limitations of Liability
WARRANTY
OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or
other period if specified) from date of sale by OMRON.
OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT,
MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER
ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET
THE REQUIREMENTS OF THEIR INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR
IMPLIED.
LIMITATIONS OF LIABILITY
OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS,
OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON
CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT LIABILITY.
In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted.
IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS 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 OR REPAIR.
Application Considerations
SUITABILITY FOR USE
OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of
products in the customer's application or use of the products.
Take all necessary steps to determine the suitability of the product for the systems, machines, and equipment with which it will
be used.
Know and observe all prohibitions of use applicable to this product.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT
ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON
PRODUCTS ARE PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR
SYSTEM.
Disclaimers
CHANGE IN SPECIFICATIONS
Product specifications and accessories may be changed at any time based on improvements and other reasons. Consult with
your OMRON representative at any time to confirm actual specifications of purchased product.
DIMENSIONS AND WEIGHTS
Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.
Related Products
Heater Element Burnout Detector
K2CU
Enables detection of single-phase/three-phase burnouts.
For heaters with ON/OFF control only, provides voltage
fluctuation compensation.
Rated current: 0.25 to 80 A AC
Current Sensor
SAO
Enables detection of single-phase/three-phase overcurrents.
Inverse operation models and instantaneous operation models
(with startup lock) are available.
Rated current: 1 to 160 A AC
For details, refer to the Measuring & Motor Protective Relays Group Catalog (Cat. No. X070).
• The application examples provided in this catalog are for reference only. Check functions and safety of the equipment before use.
• Never use the products for any application requiring special safety requirements, such as nuclear energy control systems, railroad systems, aviation systems, medical equipment,
amusement machines, vehicles, safety equipment, or other application involving serious risk to life or property, without ensuring that the system as a whole has been designed to address
the risks, and that the OMRON products are properly rated and installed for the intended use within the overall equipment or system.
ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
OMRON Corporation
Industrial Automation Company
Authorized Distributor:
Tokyo, JAPAN
Contact: www.ia.omron.com
Regional Headquarters
OMRON EUROPE B.V.
Wegalaan 67-69-2132 JD Hoofddorp
The Netherlands
Tel: (31)2356-81-300/Fax: (31)2356-81-388
OMRON ELECTRONICS LLC
One Commerce Drive Schaumburg,
IL 60173-5302 U.S.A.
Tel: (1) 847-843-7900/Fax: (1) 847-843-7787
OMRON ASIA PACIFIC PTE. LTD.
No. 438A Alexandra Road # 05-05/08 (Lobby 2),
Alexandra Technopark,
Singapore 119967
Tel: (65) 6835-3011/Fax: (65) 6835-2711
OMRON (CHINA) CO., LTD.
Room 2211, Bank of China Tower,
200 Yin Cheng Zhong Road,
PuDong New Area, Shanghai, 200120, China
Tel: (86) 21-5037-2222/Fax: (86) 21-5037-2200
© OMRON Corporation 2009 All Rights Reserved.
In the interest of product improvement,
specifications are subject to change without notice.
CSM_8_4_0815
Printed in Japan
Cat. No. N137-E1-03
0508
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