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Connections
Wiring Diagram
Overvoltage/Undervoltage and Phase Sequence/Phase Loss Operation Diagram
Overvoltage
setting value
L1
L2
Input
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
Phase loss operation
L1
Input
L2
L3
Undervoltage alarm indicator
Undervoltage relay
Note: 1. The K8AB-PM 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
J-38
Three-phase Phase-sequence Phase-loss 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
Phase sequence operation
L1
L3
L1
L3
L2
L2
L2
L1
L3
Flashing Flashing
Overvoltage knob
(OVER)
Undervoltage knob
(UNDER)
Operating time knob (T)
N L1 L2 L3
Load
Indicators
Item
Power indicator
Lit when power is being supplied.
(PWR: Green)
Relay status indicator
Lit when relay is operating (normally lit).
(RY: Yellow)
Alarm
Overvoltage:
Lit for overvoltage.
indicator
Red
The indicator flashes to indicate the error
(ALM:
status after the overvoltage has exceeded
Red)
the threshold value while the operating
time is being clocked.
Undervoltage:
• Lit for an undervoltage or phase loss.
Red
The indicator flashes to indicate the
error status after the undervoltage has
exceeded the threshold value while the
operating time is being clocked.
• Lit for phase sequence error.
Setting Knobs
Item
Used to set the voltage to −30% to 25% of
Overvoltage knob
(OVER)
the rated input voltage.
Used to set the voltage to −30% to 25% of
Undervoltage knob
(UNDER)
the rated input voltage.
Operating time knob (T) Used to set the operating time to 0.1 to
30 s.
K8AB-PM
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
Undervoltage
alarm, phase
22
loss/phase se-
quence alarm
Meaning
Usage
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