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Single-phase Overcurrent/Undercurrent Relay
K8AK-AW
Ideal for Current Monitoring for
Industrial Facilities and Equipment.
• Monitor for overcurrents and undercurrents simultaneously.
Separate settings and outputs supported for overcurrents and
undercurrents.
• Use commercially available CTs (CT current on secondary
side: 0 to 1 A or 0 to 5 A).
• Manual resetting and automatically resetting supported by one
Relay.
• Startup lock and operating time can be set separately.
• Two sets of SPDT output contacts, 5 A at 250 VAC (resistive
load).
• Output status can be monitored using LED indicator.
• Inputs are isolated from the power supply.
Refer to Safety Precautions on page 11.
Refer to page 10 for commonly asked questions.
For the most recent information on models that have been certified for
safety standards, refer to your OMRON website.
Ordering Information
List of Models
Setting range
Power supply voltage
Model
2 to 20 mA AC/DC
10 to 100 mA AC/DC
50 to 500 mA AC/DC
24 VAC/DC
K8AK-AW1 24 VAC/DC
100 to 240 VAC
K8AK-AW1 100-240 VAC
0.1 to 1 A AC/DC
0.5 to 5 A AC/DC
24 VAC/DC
K8AK-AW2 24 VAC/DC
100 to 240 VAC
K8AK-AW2 100-240 VAC
10 to 100 A AC*
20 to 200 A AC*
24 VAC/DC
K8AK-AW3 24 VAC/DC
100 to 240 VAC
K8AK-AW3 100-240 VAC
* The K8AK-AW3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)
Accessory (Order Separately)
●OMRON CT
Appearance
●Commercially Available CTs*
Input range
Applicable
Relay
10 to 100 A AC,
K8AK-AW3
20 to 200 A AC
Model
K8AC-CT200L
Appearance
CT current on secondary side
0 to 1 A AC,
0 to 5 A AC
Applicable
Relay
K8AK-AW2
* If you use a commercially available CT, do not exceed the overload
capacity of the K8AK-AW2.
1
K8AK-AW
Ratings and Specifications
Input Range
Model
K8AK-AW1
Range*1
Connection
terminals
0 to 20 mA AC/DC
I1-COM
0 to 100 mA AC/DC
I2-COM
0 to 500 mA AC/DC
I3-COM
0 to 1 A AC/DC
I1-COM
0 to 5 A AC/DC
I2-COM
0 to 100 A AC
I2-COM
K8AK-AW2
K8AK-AW3
0 to 200 A AC
I3-COM
Setting range
2 to 20 mA AC/DC
10 to 100 mA AC/DC
50 to 500 mA AC/DC
0.1 to 1 A AC/DC
0.5 to 5 A AC/DC
10 to 100 A AC*2
20 to 200 A AC*2
Input impedance
Input type
Approx. 5 Ω
Direct input
Approx. 1 Ω
Direct input
Approx. 0.2 Ω
Direct input
Approx. 0.12 Ω
(Load: 0.5 VA)
Approx. 0.02 Ω
(Load: 1.5 VA)
Direct input or
commercially
available CT
---
OMRON CT
---
OMRON CT
Overload capacity
Continuous input at
120% of maximum input.
1 s at 150%
Continuous input at
120% with an OMRON
CT (K8AC-CT200L).
30 s at 200%
1 s at 600%
* CT capacity on primary
side.
*1 The range is selected using connected terminals.
*2 The K8AK-AW3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)
2
K8AK-AW
Ratings
Power supply
voltage
Isolated power supply
24 VAC/DC
100 to 240 VAC
Power consumption
24 VAC/DC: 2.0 VA/1.1 W max.
100 to 240 VAC: 4.6 VA max.
Operating value setting range (SV)
10% to 100% of the maximum value of the setting range
K8AK-AW1: 2 to 20 mA AC/DC
10 to 100 mA AC/DC
50 to 500 mA AC/DC
K8AK-AW2: 0.1 to 1 A AC/DC (Compatible with commercially available CTs.)
0.5 to 5 A AC/DC (Compatible with commercially available CTs.)
K8AK-AW3: When used with the OMRON CT (K8AC-CT200L).
10 to 100 A AC
20 to 200 A AC
Operating value
100% operation at set value
Reset value
5% of operating value (fixed)
Reset method
Manual reset/automatic reset (switchable)
Note: Manual reset: Turn OFF power supply for 1 s or longer.
Operating time setting range (T)
0.1 to 30 s
Startup lock time setting range (LOCK)
Note: Enabled only for overcurrent
operation.
0 to 30 s
(The startup lock timer starts when the input has reached approximately 30% or more of the set value.)
Note: Enabled only for overcurrent operation.
Indicators
Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red
Input impedance
Refer to Input Range on previous page.
Output relays
Two SPDT relay outputs (normally closed operation)
Output relay ratings
Rated load
Resistive load
5 A at 250 VAC
5 A at 30 VDC
Maximum switching capacity: 1,250 VA, 150 W
Minimum load: 5 VDC, 10 mA (reference values)
Mechanical life: 10 million operations min.
Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations
3 A at 250 VAC/30 VDC: 100,000 operations
Ambient operating temperature
−20 to 60°C (with no condensation or icing)
Storage temperature
−25 to 65°C (with no condensation or icing)
Ambient operating humidity
25% to 85% (with no condensation)
Storage humidity
25% to 85% (with no condensation)
Altitude
2,000 m max.
Terminal screw tightening torque
0.49 to 0.59 N·m
Terminal wiring method
Recommended wire
Solid wire: 2.5 mm2
Twisted wires: AWG16, AWG18
Note: 1. Ferrules with insulating sleeves must be used with twisted wires.
2. Two wires can be twisted together.
Recommended ferrules
Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact
Al 1-8RD (for AWG18) manufactured by Phoenix Contact
Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Case color
N1.5
Case material
PC and ABS, UL 94 V-0
Weight
Approx. 150 g
Mounting
Mounts to DIN Track.
Dimensions
22.5 × 90 × 100 mm (W×H×D)
3
K8AK-AW
Specifications
Allowable operating voltage range
85% to 110% of power supply voltage
Allowable operating frequency range
50/60 Hz ±5 Hz
Input frequency range
K8AK-AW1 and K8AK-AW2: DC input or AC input (45 to 65 Hz)
K8AK-AW3: AC input (45 to 65 Hz)
Overload capacity
K8AK-AW1 and K8AK-AW2: Continuous input at 120% of maximum input, 1 s at 150%
K8AK-AW3: Continuous input at 120%, 30 s at 200%, and 1 s at 600% with an OMRON CT (K8AC-CT200L).
Note: CT capacity on primary side.
Repeat accuracy
Applicable standards
Operating value
±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage, DC or 50/60 Hz sine wave input)
Operating time
±50 ms (at 25°C and 65% humidity, rated power supply voltage)
Conforming standards
EN 60947-5-1
Installation environment (pollution level 2, installation category III)
EMC
EN 60947-5-1
Safety standards
UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: C22.2 No.14,
CCC: GB14048.5
Insulation resistance
20 MΩ min.
Between external terminals and case
Between power supply terminals and input terminals
Between power supply terminals and output terminals
Between input terminals and output terminals
Dielectric strength
2,000 VAC for one minute
Between external terminals and case
Between power supply terminals and input terminals
Between power supply terminals and output terminals
Between input terminals and output terminals
Noise immunity
1,500 V power supply terminal common/normal mode
Square-wave noise of ±1 µs/100 ns pulse width with 1-ns rise time
Vibration resistance
Frequency: 10 to 55 Hz, acceleration 50 m/s2
10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance
100 m/s2, 3 times each in 6 directions along 3 axes
Degree of protection
Terminals: IP20
●Relationship of Mounting Distance between
K8AK-AW Relays and Input Current
(Reference Values)
The following diagram shows the relationship between the mounting
distances and the input current.
If the relay is used with an input current that exceeds these values,
the temperature of the K8AK may rise and shorten the life of the
internal components.
AW (I2 terminal)
Ambient temperature [°C]
60
I=1A
I=0A
50
I=3A
40
30
I=5A
20
10
5
10
Distance between products d [mm]
0
15
Test method
Sample: K8AK-AW
Applied voltage: 240 VAC
Mounting distances: 0, 5, and 10 mm min.
K8AK
No.1
DIN Track
4
K8AK
No.2
K8AK
No.3
K8AK
No.4
Distance between products: d
K8AK
No.5
K8AK-AW
Connections
Terminal Diagram
K8AK-AW1 100-240VAC
A
B
Relay Output
Control Output
A Current Input
21
Common
Relay output
250 VAC, 5 A (resistive load)
30 VDC, 5 A (resistive load)
21
24
24
22
AW2
AW1
22
C
I2
I3
C
I2
I3
C
100 mA max.
AW3
I2
I3
C
I2
I3
CT
5 A max.
100 A max.
500 mA max.
CT
200 A max.
1 A max.
20m A max.
I1
I1
I1
B Power Supply Voltage
100 to 240 VAC
A1
24 VAC/DC
A2
A1
A2
A1
A2
I1
11
12
14
Relay Output
Common
11
12
14
(No polarity)
Note: 1.
2.
3.
4.
5.
6.
Do not connect anything to terminals that are shaded in gray.
There is no polarity for the DC power supply input.
For the current input, you can input only from the C terminal and one other terminal.
Refer to Setting Ranges and Wiring Connections on the I1, I2, and I3 current input terminals.
Use the recommended ferrules if you use twisted wires.
The K8AK-AW3 is designed to be used in combination with the OMRON K8AC-CT200L Current Transformer (CT).
Wiring Example
Directly Inputting a Current
Using a CT
Single-phase
power supply
Load
Single-phase
power supply
Load
CT
21
24
22
21
24
22
C
I2
I3
C
I2
I3
Power
supply
AC/DC
Power
supply
AC/DC
Power
A2
supply voltage A1
Power
A2
supply voltage A1
A1
A2
I1
A1
A2
I1
11
12
14
11
12
14
5
K8AK-AW
Timing Charts
●Overcurrent and Undercurrent Operation
Diagram
●Undercurrent and Undercurrent Operation
Diagram (Undercurrent Pre-alarm Mode)
DIP switch settings: SW3 ON and SW4 ON, or SW3 OFF and SW4
OFF
DIP switch settings: SW3 OFF and SW4 ON.
Power
supply voltage
Power
supply voltage
Overcurrent
set value (AL1)
Hysteresis: Fixed at 5%
Input
Undercurrent
set value (AL2)
AL1 alarm indicator
AL2 alarm indicator
Flashing
Flashing
t
Lit
LOCK
LOCK:
Startup lock time
(0 to 30 s)
AL1 alarm indicator
Lit
AL2 alarm indicator
t: Operating time (0.1 to 30 s)
Delay: 250 ms
(reference value)
t
Delay: 250 ms
(reference value)
t: Operating time (0.1 to 30 s)
●Overcurrent and Overcurrent Operation
Diagram (Overcurrent Pre-alarm Mode)
DIP switch settings: SW3 ON and SW4 OFF.
Power
supply voltage
Overcurrent
set value (AL1)
Overcurrent
set value (AL2)
Input
Hysteresis: Fixed at 5%
Hysteresis: Fixed at 5%
Flashing
Flashing
Lit
Lit
Overcurrent (AL1)
contacts (11-14)
Overcurrent (AL2)
contacts (21-24)
Delay: 250 ms
(reference value)
LOCK
LOCK:
Startup lock time
(0 to 30 s)
Delay: 250 ms
(reference value)
t
t: Operating time (0.1 to 30 s)
t
t: Operating time (0.1 to 30 s)
Note 1. The K8AK-AW@ output contacts are normally operative.
Note 2. The startup lock prevents unnecessary alarms from being generated during the
unstable period when the power is first turned ON. There is no contact output during
timer operation.
6
Hysteresis: Fixed at 5%
Flashing
Lit
Flashing
Lit
Undercurrent (AL1)
contacts (11-14)
Undercurrent (AL2)
contacts (21-24)
Delay: 250 ms
(reference value)
LOCK
LOCK:
Startup lock time
(0 to 30 s)
Delay: 250 ms
(reference value)
t
Note 1. The K8AK-AW@ output contacts are normally operative.
Note 2. The startup lock prevents unnecessary alarms from being generated during the
unstable period when the power is first turned ON. There is no contact output
during timer operation.
AL2 alarm indicator
Hysteresis: Fixed at 5%
Hysteresis: Fixed at 5%
Overcurrent (AL1)
contacts (11-14)
Undercurrent (AL2)
contacts (21-24)
AL1 alarm indicator
Input
Undercurrent
set value (AL1)
Undercurrent
set value (AL2)
t: Operating time (0.1 to 30 s)
t: Operating time (0.1 to 30 s)
t
Note 1. The K8AK-AW@ output contacts are normally operative.
Note 2. The startup lock prevents unnecessary alarms from being generated
during the unstable period when the power is first turned ON. There is no
contact output during timer operation.
K8AK-AW
Nomenclature
●Indicators
Front
Item
Terminal block
(See notes 1 and 2.)
Current knob (AL1)
Power indicator
Relay status indicator
Alarm indicator
Power indicator
(PWR: Green)
Lit when power is being supplied.
Relay status indicator
(RY: Yellow)
Lit when relay is operating.
Alarm indicator
(ALM: Red)
Lit when there is an overcurrent or undercurrent.
The indicator flashes to indicate the error status after the input has exceeded
the set value while the operating time is
being clocked.
Current knob (AL2)
Operating time knob (T)
Alarm indicator
●Setting Knobs
Item
Startup lock time knob
(LOCK)
Terminal block
(See notes 1 and 2.)
Meaning
Usage
Current knob (AL1)
Used to set the current to 10% to 100%
of maximum setting range.
Current knob (AL2)
Used to set the current to 10% to 100%
of maximum setting range.
Operating time knob (T)
Used to set the operating time to 0.1 to
30 s.
Startup lock time knob
(LOCK)
Used to set the startup lock time to 0 to
30 s.
Note: 1. Use either a solid wire of 2.5 mm2 maximum or a ferrule with
insulating sleeve for the terminal connection.
The length of the exposed current-carrying part inserted into
the terminal must be 8 mm or less to maintain dielectric
strength after connection.
For 2.5 mm2 or
smaller solid wires
8 mm max.
For ferrules with
an insulation sleeve.
8 mm max.
Recommended ferrules
Phoenix Contact
• Al 1,5-8BK (for AWG16)
• Al 1-8RD (for AWG18)
• Al 0,75-8GY (for AWG18)
2. Tightening torque: 0.49 to 0.59 N·m
7
K8AK-AW
Operation Methods
Setting Ranges and Wiring Connections
Model
K8AK-AW1
Setting range
2 to 20 mA AC/DC
Direct input
I1-COM
10 to 100 mA AC/DC
Direct input
I2-COM
50 to 500 mA AC/DC
Direct input
I3-COM
0.1 to 1 A AC/DC
I1-COM
0.5 to 5 A AC/DC
Direct input or
commercially
available CT
10 to 100 A AC*
OMRON CT
I2-COM
20 to 200 A AC*
OMRON CT
I3-COM
K8AK-AW2
K8AK-AW3
Wiring
connections
Input type
Note: The DC input terminals have no polarity.
* The K8AK-AW3 is designed to be used in combination
with the OMRON K8AC-CT200L Current Transformer
(CT). (Direct input is not possible.)
I2-COM
Connections
●Input
<For K8AK-AW3>
Connect the input between the I1-COM, I2-COM, or I3-COM terminals, according to the input
current. Malfunctions may occur if the input is connected to unused terminals and the Unit will
not operate correctly.
Terminal I1 is not used by the K8AK-AW3.
If using the OMRON K8AC-CT200L CT, connect to terminals k and l on the K8AC-CT200L.
(Terminals kt and lt are not used.)
Single-phase power
K8AK-AW3
A1
Power supply
voltage
●Power Supply
A2
K8ACCT200L
Connect the power supply to terminals A1 and A2.
●Outputs
k
Current input
I1
I2
I3
AL1 (SPDT relay) is output to terminals 11, 12, and 14.
AL2 (SPDT relay) is output to terminals 21, 22, and 24.
Note: Use the recommended ferrules if using twisted wires.
C (COM)
l
14
Signal output
12
DIP Switch Settings
The resetting method, relay drive method, and operating mode are set using the DIP switch
located on the bottom of the Unit.
K8AK-AW@ does not use SW1.
Load
11
AL1 relay
signal
output
24
Signal output
22
21
AL2 relay
signal
output
●DIP Switch Functions
OFF ● ↑
OFF
1
2
3
4
●
---
---
❍
---
---
---
●
●
---
❍
●
Undercurrent Undercurrent
---
●
❍
Overcurrent
---
❍
❍
OFF
Pin
ON
ON ❍ ↓
SW4
SW3
SW2
SW1
Resetting
method
DIP switch pins
Operating
mode
ON
Manual reset
Automatic reset
AL1
AL2
Overcurrent
Undercurrent
Overcurrent
Overcurrent
Undercurrent
Not used.
Note: All pins are set to OFF at the factory.
Setting Method
●Setting Current
The current knob (SV) is used to set the current.
The current can be set to 10% to 100% of the maximum setting range.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes (when the set value and the input have reached the
same level.)
Use this as a guide to set the current.
The maximum setting range will differ depending on the model and the input terminal.
Example: K8AK-AW3 Using Input Terminals I3-COM
The maximum measuring current will be 200 A AC and the setting range will be 20 to 200 A.
8
K8AK-AW
●Operating Time
The operating time is set using the operating time knob (T).
The operating time can be set to between 0.1 and 30 s.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes (when the set value and the input have reached the
same level.)
Use this as a guide to set the operating time.
If the input current exceeds (drops lower than) the set value, the alarm indicator will start flashing for the set period and then stay lit.
●Startup Lock Time
Inrush current
The startup lock time is set using the startup lock time knob (LOCK).
The startup lock time can be set to between 0 and 30 s.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes
(when the set value and the input have reached the same level.)
Use this as a guide to set the startup lock time.
The startup lock time will start when the input current reaches 30% or more of the set value.
Use startup lock time to prevent unwanted operation, e.g., as a result of inrush current.
Current set value
30% of current set value
Startup lock time
There are no outputs
Startup lock timer start during this period.
Dimensions
(Unit: mm)
Single-phase Current Relays
K8AK-AW1
K8AK-AW2
K8AK-AW3
22.5
100
90
72
5
OMRON CT
K8AC-CT200L
9.3
9.3
1.7
1.7
11
4.7
63
54
20
Four M4 × 6 screws
Mounting Hole Dimensions
17
50
8.5
13.5
Two M5 screw holes or
two 5.5-dia. holes
34.5
81.5
76
33.5
6
57
14.5
30 dia.
14.5
86
5.2
10
10
Note: The OMRON Current Transformer (CT) is
designed to be used with the K8AK-AW3.
Use terminals k and l for connections.
(Terminals kt and lt are not used.)
20
1.8
4.1
5.9
76
Optional Parts for DIN Track Mounting
●DIN Tracks
PFP-100N
PFP-50N
7.3±0.15
4.5
35±0.3
15
25
10
25
25
1,000 (500)*
10
25
15 (5)*
27±0.15
1
*Dimensions in parentheses are for the PFP-50N.
9
K8AK-AW
Questions and Answers
Q
Checking Operation
Overcurrents
Gradually increase the input from 80% of the set value.
The input will equal the operating value when the input
exceeds the set value and the alarm indicator starts flashing.
Operation can be checked by the relay outputs that will start
after the operating time has passed.
Undercurrent
Gradually decrease the input from 120% of the set value and
check the operation using the same method as for
overcurrent.
Example: Overcurrent Operating Mode, Normally Closed Relay Drive,
and an Operating Time of 5 s.
Set value
Current input
Lit
Flashing
Alarm indicator
5s
Can a motor with a rated current of 5 A be
monitored using the K8AK?
Are there any application precautions?
The K8AK-AW1 and K8AK-AW2 cannot be used with motor
loads. Use the K8AK-AW3 in combination with the K8ACCT200L Current Transformer (CT). With motor loads, the
startup current and stall current will cause a current of many
times the rated current to flow. Refer to the following figure for
information on the motor startup current.
Motor current (percentage of rated value)
Q
500%
100%
Several seconds to
several tens of seconds
Relay output
Time from beginning of startup
Connection Diagram
A
100 VAC
0 to 10 A
30 Ω
400 W (two in parallel)
Output
Input terminals
Power
supply
Variable autotransformer
A1
A2
For a motor with a rating of 5 A, the startup current will be
approximately 30 A. The startup current will exceed the
overload capacity (rating: 150% for 1 s) of the K8AK-AW1 and
K8AK-AW2 and result in failure of the Relay.
To monitor the motor load, use the K8AK-AW3. (Overload
capacity: 120% of rating for continuous load, 200% of rating for
30 s, and 600% of rating for 1 s).
The K8AK-AW3 has a large input range. Pass the conductors
multiple times through the special CT.
100 VAC
Primary-side conductor
To the K8AK-AW3
±
C 100 V
Cycle counter
Q
How to Measure the Operating Time
Example: Monitoring Overload of a Motor with a Rated Current of 5 A
Overcurrent
Change the input suddenly from 0% to 120% of the set value
and measure the time until the Unit operates.
Undercurrent
Change the input suddenly from 120% to 0% of the set value
and measure the time until the Unit operates.
Q
Monitoring Switch-mode Power Supplies
Switch-mode Power Supplies cannot be monitored. In circuits
with a capacitor input, including switch-mode power supplies,
the input capacitor recharge current flows in pulse form as the
load current. The K8AK-AW@ has a built-in filter as a
countermeasure against high frequencies and cannot be
used to remove pulse current.
10
K8AC-CT200L
Concept behind Passing Conductor through the CT When
Using the K8AK-AW3
K8AK set value:
Overcurrent detection, operating value setting: 25%, operating time: 0.1 s
Startup lock timer: 0.1 to 30 s (Set the timer according to the duration of the
startup current.)
The setting range for the K8AK-AW3 is 10% to 100% of the rated
current (i.e., 10 to 100 A). Pass the conductors through the CT five
times so that at least 10 A of current flows. The input current to the
K8AK will be 25 A (i.e., 5 A x 5 loops).
If a startup current of six times the rated current is generated, it will be
150 A (i.e., 25 A x 6). The overload capacity for the K8AK-AW3 is
200% of the rating for 30 s. The Relay will not fail even if the startup
current continues for 30 s, and it is possible to perform overload
detection.
K8AK-AW
Safety Precautions
Be sure to read the precautions for all models in the website at the following URL: http://www.ia.omron.com/.
Warning Indications
CAUTION
Indicates a potentially hazardous situation
which, if not avoided, may result in minor or
moderate injury or in property damage.
Precautions for Safe
Use
Supplementary comments on what to do or
avoid doing, to use the product safely.
Precautions for
Correct Use
Supplementary comments on what to do or
avoid doing, to prevent failure to operate,
malfunction, or undesirable effects on
product performance.
Meaning of Product Safety Symbols
Used to warn of the risk of electric shock under
specific conditions.
Used for general prohibitions for which there is no
specific symbol.
Used to indicate prohibition when there is a risk of
minor injury from electrical shock or other source if
the product is disassembled.
CAUTION
Electrical shock may cause minor injury.
Do not touch terminals while electricity is being supplied.
There is a risk of minor electrical shock, fire, or device failure.
Do not allow any pieces of metal, conductors, or cutting chips
that occur during the installation process to enter the product.
Explosions may cause minor injuries. Do not use the product
in locations with inflammable or explosive gases.
There is a risk of minor electrical shock, fire, or device failure.
Do not disassemble, modify, repair, or touch the inside of the
product.
Loose screws may cause fires. Tighten terminal screws to the
specified torque of 0.49 to 0.59 N·m.
Use of excessive torque may damage the terminal screws.
Tighten terminal screws to the specified torque of 0.49 to
0.59 N·m.
Used for general mandatory action precautions for
which there is no specified symbol.
Use of the product beyond its life may result in contact welding
or burning. Make sure to consider the actual operating
conditions and use the product within its rated load and
electrical life count. The life of the output relay varies
significantly with the switching capacity and switching
conditions.
11
K8AK-AW
Precautions for Safe Use
1. Do not use or store the product in the following locations.
• Locations subject to water or oil
• Outdoor locations or under direct sunlight
• Locations subject to dust or corrosive gases (particularly
sulfurizing gases, ammonia, etc.)
• Locations subject to rapid temperature changes
• Locations prone to icing and dew condensation
• Locations subject to excessive vibration or shock
• Locations subject to wind and rain
• Locations subject to static electricity and noise
• Habitats of insects or small animals
2. Use and store the product in a location where the ambient
temperature and humidity are within the specified ranges. If
applicable, provide forced cooling.
3. Mount the product in the correct direction.
4. Check terminal polarity when wiring and wire all connections
correctly. The power supply terminals do not have polarity.
5. Do not wire the input and output terminals incorrectly.
6. Make sure the power supply voltage and loads are within the
specifications and ratings for the product.
7. Make sure the crimp terminals for wiring are of the specified size.
8. Do not connect anything to terminals that are not being used.
9. Use a power supply that will reach the rated voltage within 1
second after the power is turned ON.
10.Keep wiring separate from high voltages and power lines that
draw large currents.
Do not place product wiring in parallel with or in the same path as
high-voltage or high-current lines.
11.Do not install the product near equipment that generates high
frequencies or surges.
12.The product may cause incoming radio wave interference. Do not
use the product near radio wave receivers.
13.Install an external switch or circuit breaker and label it clearly so
that the operator can quickly turn OFF the power supply.
14.Make sure the indicators operate correctly. Depending on the
application environment, the indicators may deteriorate
prematurely and become difficult to see.
15.Do not use the product if it is accidentally dropped. The internal
components may be damaged.
16.Be sure you understand the contents of this catalog and handle
the product according to the instructions provided.
17.Do not install the product in any way that would place a load on it.
18.When discarding the product, properly dispose of it as industrial
waste.
19.When using the product, remember that the power supply
terminals carry a high voltage.
20.The product must be handled only by trained electrician.
21.Prior to operation, check the wiring before you supply power to
the product.
22.Do not install the product immediately next to heat sources.
23.Perform periodic maintenance.
Precautions for Correct Use
Observe the following operating
methods to prevent failure and
malfunction.
1. Use the power supply voltage, input power, and other power
supplies and converters with suitable capacities and rated
outputs.
2. Use a precision screwdriver or similar tool to adjust the setting
knobs.
3. The distortion in the input waveform must be 30% max. If the
input waveform is distorted beyond this level, it may cause
unnecessary operation.
4. Error will be large if the product is used for thyristor or inverter
control.
5. To reduce the error in the setting knob, always turn the setting
knob from the minimum setting toward the maximum setting.
6. When cleaning the product, do not use thinners or solvents. Use
commercial alcohol.
Correct Mounting Direction, Mounting,
and Removing
• Mounting to DIN Track
1. Attach the product to the DIN Track with the tab at the top and
the hooks at the bottom.
2. Push the product onto the Track until the hooks lock into place.
A
B
• Removing from the DIN Track
Pull down on the bottom hook with a flat-blade screwdriver and lift
up on the product.
Applicable DIN Tracks:
PFP-100N (100 cm)
PFP-50N (50 cm)
Adjusting the Setting Knobs
• Use a screwdriver to adjust the setting knobs. The knobs have a
stopper that prevents them from turning beyond the full right or left
position. Do not force a knob beyond these points.
Setting knob
12
MEMO
13
MEMO
14
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.
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 2014 All Rights Reserved.
In the interest of product improvement,
specifications are subject to change without notice.
CSM_3_2_1015
Cat. No. N180-E1-01
0513
0314 (0314)
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