GE MI-869 - Page 327

CHAPTER 4: SETPOINTS PROTECTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–209
Figure 4-71: Phase Reversal logic diagram
894161A1.CDR
SETPOINT
Configurable
FUNCTION:
Disabled=0 Trip Alarm Latched Alarm
OR
SETPOINT
BLOCK:
Off=0
VA VB VC
AND
RUN
SETPOINT
Phase Reversal
PICKUP DELAY:
SETPOINTS
DROPOUT DELAY:
t
PKP
t
RST
FLEXLOGIC OPERAND
AND AND AND
Operate Output
Relay 1(TRIP)
LED: TRIP
OR
LED: ALARM
LATCH
S R
RESET
Command
FLEXLOGIC OPERAND
Phase Reversal OP
SETPOINT
Output Relay X
Do Not Operate, Operate
Phase Voltages from Phase
Voltage VT bank
VT Fuse Fail 1 OP
FLEXLOGIC OPERAND
ACTUAL VALUES
Vab > 50% x VT
Vbc > 50% x VT Vca > 50% x VT
AND
PHASE ROTATION:
From Setpoints > System > Power System
VAB VBC VCA
Phase Reversal PKP Phase Rev Inhibit