Service
Operation & Maintenance Manual
61
The voltage unbalance tripping is activated when the unbalance e5% more than 3 seconds. Similarly, phase
loss tripping has 2 second delay and phase reverse tripping has 0.5 second delay.
The over voltage tripping point and tripping delay are configurable through rotary switch on the voltage monitoring relay.
The under voltage tripping point and tripping delay are also configurable through another rotary switch on the voltage
monitoring relay. The factory setting of the rotary switches are shown in the below table.
Rate Voltage
380VAC
400VAC
Over Voltage Value
416VAC
440VAC
Over Voltage Delay
4S
Under Voltage Value
342VAC
360VAC
Under Voltage Delay
4S
Table 23
Table 22
REV.
UNBAL.
AUTO
5S/1S
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Reverse phase protected
Reverse phase unprotected
Unbalance protected
Unbalance unprotected
Auto reset
Manual reset
Auto reset delay 5 sec
Auto reset delay 1 sec
OFF
UNBAL.
AUTO
5S
1S
REV.
