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