GE 339

CHAPTER 6: SETPOINTS S3 PROTECTION
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 6–85
Figure 6-36: Positive sequence undervoltage logic diagram
Positive Sequence
Voltage
(computed)
SETPOINTS
SETPOINT
POS SEQ UV FUNCTION: Disabled = 0 Latched Alarm
POS SEQ UV PKP: POS SEQ UV CURVE: POS SEQ UV DELAY:
AND
Operate Output Relay 1 (TRIP)
Event Recorder Transient Recorder
LED: ALARM
LED: TRIP
Alarm
OR
OR
AND
AND
RESET
Command
SETPOINTS
Do Not Operate, Operate
OUTPUT RELAY X
Trip
AND
Trip (To Breaker Failure)
OR
SETPOINTS
BLOCK 1 Off = 0 BLOCK 2: Off = 0 BLOCK 3: Off = 0
OR
RUN
V_1
PICKUP
V_1 > Minimum
POS SEQ UV MIN V:
SETPOINT
AND
LED: PICKUP
Event Recorder
Transient Recorder
Pos Seq Undervoltage
Message
898853A1.cdr