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Connections
Wiring Diagram
Voltage Asymmetry and Phase Sequence/Phase Loss Operation Diagram
L1
Input
L2
L3
Flashing
Alarm indicator
Relay
T1: Power ON lock (1 s or 5 s)
T1
Phase loss operation
L1
Input
L2
L3
Alarm indicator
Relay
Note: 1. The K8AB-PA 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.
Calculating the Asymmetry Operating Voltage
Asymmetry operation condition = (Highest voltage −
Lowest voltage) > Asymmetry operating voltage
Asymmetry operating voltage = Rated input voltage (V)
× Asymmetry set value (%)
Note: The rated input voltage is selected and set with
the DIP switch.
Nomenclature
Front
Power indicator
Relay status indicator
Alarm indicator
J-46
Three-phase Asymmetry and Phase-sequence Phase-loss Relay
Asymmetry operation voltage (set value)
Lit
T: Operating time (0.1 to 30 s)
T
Phase sequence operation
L1
L3
L1
L3
L2
L2
L2
L1
L3
Flashing Flashing
Asymmetry rate knob
(ASY.)
Operating time knob (T)
N L1 L2 L3
Load
Indicators
Item
Power indicator (PWR: Green)
Relay status indicator (RY: Yellow) Lit when relay is operating
Alarm indicator (ALM: Red)
Setting Knobs
Item
Asymmetry rate knob (SV) Used to set the asymmetry rate to 2%
to 22%.
Operating time knob (T)
Used to set the operating time to 0.1 to
30 s.
K8AB-PA
The power
supply is
shared with
the rated in-
put voltage.
Input
L1
L2
N
L3
14
11
Output
Alarm
12
Meaning
Lit when power is being
supplied.
(normally lit).
Asymmetry voltage error
indicator
The indicator flashes to indicate
the error status after the input
has exceeded the threshold
value while the operating time is
being clocked.
Usage
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