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■ Operation and Setting Methods
Setting Ranges and Wiring Connections
Model
Measuring current
K8AB-AS1
2 to 20 mA AC/DC
10 to 100 mA AC/DC
50 to 500 mA AC/DC
K8AB-AS2
0.1 to 1 A AC/DC
0.5 to 5 A AC/DC
0.8 to 8 A AC/DC
K8AB-AS3
10 to 100 A AC (See note 2.)
20 to 200 A AC (See note 2.)
Connections
1. Input
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 K8AB-AS3.
If using the OMRON K8AC-CT200L CT, connect to terminals k and l on the K8AC-CT200L.
(Terminals kt and lt are not used.)
2. Power Supply
Connect the power supply to terminals A1 and A2.
Note: Models with DC power supply have a non-isolated power supply. The input and power
supply terminals are connected internally so the K8AB-AS will not operate normally if an
unwanted current path is created. If an unwanted current path exists, use a model with an
AC power supply or isolate with an external power supply.
3. Outputs
SPDT relays are output to terminals 11, 12, and 14.
Note: Use the recommended ferrules if using twisted wires.
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.
K8AB-AS@ does not use SW1.
ON
OFF
SW1
SW2
DIP switch
SW3
SW4
Setting Method
1. Setting Current
The current knob (SV) is used to set the current.
The current can be set to 10% to 100% of the maximum measuring current.
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 measuring current will differ depending on the model and the input terminal.
Example: K8AB-AS3 Using Input Terminals I3-COM
The maximum measuring current will be 200 A AC and the setting range will be 20 to 200 A.
Cat. No. N142-E1-02
Wiring
connection
I1-COM
I2-COM
I3-COM
I1-COM
I2-COM
Note: 1. The DC input terminals have no polarity.
I3-COM
I2-COM
I3-COM
DIP Switch Functions
SWITCH
Resetting method
Automatic reset
Manual reset
Relay drive method Normally closed
Normally open
Operating mode
Undercurrent
Overcurrent
Note: All pins are set to OFF at the factory.
Single-phase Current Relay
2. The K8AB-AS3 is designed to be used in combination with
the OMRON K8AC-CT200L Current Transformer (CT).
(Direct input is not possible.)
<For K8AB-AS3>
Single-phase power
Load
ON ● ↑
3
4
ON
OFF ❍ ↓
OFF
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●
---
❍
---
●
---
❍
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K8AB-AS3
A1
Power supply
voltage
A2
K8AC-
CT200L
I1
I2
Current input
k
I3
COM
l
14
11
Signal output
Relay
12
signal
output
2
1
●
❍
---
NO USE
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K8AB-AS
7
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