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Connections
■ Wiring Diagram
Overvoltage and Undervoltage Operation Diagram
Overvoltage
setting value
L1
Input
L2
L3
Undervoltage setting value
Overvoltage alarm indicator
Flashing
Undervoltage alarm indicator
Overvoltage relay
Undervoltage relay
T1: Power ON lock (1 s or 5 s)
T1
Note: 1. The K8AB-PW output relay is normally operative.
2. The power ON lock prevents unnecessary alarms from
being generated during the instable period when the power
is first turned on. There is no relay output during timer
operation.
Nomenclature
■ Front
Power indicator
Relay status indicator
Alarm indicator
4
Three-phase Voltage Relay
Hysteresis: Fixed at 5%
Hysteresis: Fixed at 5%
Flashing
Lit
T
T: Operating time (0.1 to 30 s)
Lit
T: Operating time (0.1 to 30 s)
T
Overvoltage knob (OVER)
Undervoltage knob (UNDER)
Operating time knob (T)
K8AB-PW
N L1 L2 L3
Load
Indicators
Item
Power indicator (PWR: Green)
Relay status indicator (RY: Yellow) Lit when relay is operating
Alarm
Overvoltage: Red
indicator
(ALM: Red)
Undervoltage: Red The indicator flashes to indicate
Setting Knobs
Item
Overvoltage knob (OVER) Used to set the voltage to −30% to 25%
of the rated input voltage.
Used to set the voltage to −30% to 25%
Undervoltage knob
(UNDER)
of the rated input voltage.
Operating time knob (T)
Used to set the operating time to 0.1 to
30 s.
The power
supply is
shared with
the rated in-
put voltage.
Input
L1
L2
N
L3
14
11
Output
Over-
12
voltage
alarm
24
21
Output
Under-
voltage
22
alarm
Meaning
Lit when power is being
supplied.
(normally lit).
The indicator flashes to indicate
the error status after the
overvoltage has exceeded the
threshold value while the
operating time is being clocked.
the error status after the
undervoltage has exceeded the
threshold value while the
operating time is being clocked.
Usage
Cat. No. N148-E1-01
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