GE 339

6–78 339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Figure 6-32: Phase Undervoltage logic diagram
SETTING
PH UV FUNCTION Disabled = 0
Latched Alarm Alarm
Trip
SETTING
BLOCK 1: Off = 0 BLOCK 2: Off = 0 BLOCK 3: Off = 0
PH UV ALARM PKP
S R
LATCH
896831.cdr
LOGIC OPERAND
PH UV ALARM OP
LOGIC OPERAND
OR
OR
AND
AND
AND
AND
OR
AND
AND
INPUTS
Emergency Restart Input Lockout Reset Input
SETTINGS
Off = 0 Lockout Reset Off = 0
Emergency Restart
S4 CONTROLS
PH UV Alarm State: Operate
TARGET MESSAGE
ANY ALARM OP
PH UV TRIP OP
ANY TRIP OP
S R
LATCH
PH UV Trip State: Operate
TARGET MESSAGE
ANY ALARM PKP PH UV TRIP PKP ANY TRIP PKP
AND AND
OR
S3 PHASE UV
S3 PHASE UV
OR
Reset Input
Reset Off = 0
AND
OR
KEYPAD RESET
ANY LATCHED ALARM OP
PH UV State: Pickup
Alarm
TARGET MESSAGE
PH UV State: Pickup
Trip
S3 PHASE UV
Vab
PH UV PICKUP: PH UV CURVE: PH UV DELAY:
Vbc Vca
RUN RUN
RUN
PICKUP
Van Vbn
Vcn
PICKUP
PICKUP
Van or Vab > Minimum
Vbn or Vbc > Minimum
Vcn or Vca > Minimum
PH UV MIN VOLTAGE:
S3 PHASE UV
AND
AND
AND
DeltaWye
All Three
Any One
Any Two
Operate for programmed combination
Any Two Any One
All Three
S3 PHASE UV
PH UV PHASES
OR OR
Pickup for programmed combination
896831A1.cdr
SETTING
SETTING
VT CONNECTION
S2 SYSTEM SETUP
SETTING
OUTPUT RELAY X
SETTING
Do Not Operate, Operate