GE 339

CHAPTER 6: SETPOINTS S4 CONTROLS
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 6–131
OUTPUT RELAY X
For details see Common setpoints
.
Figure 6-54: Breaker Failure / Welded Contactor logic diagram
LOGIC OPERAND
BF ALARM OP ANY ALARM OP
ANY LATCHED ALARM OP
WELDED ALARM OP
S
R
LATCH
AND
AND
INPUTS
Emergency Restart Input Lockout Reset Input
SETTINGS
Off = 0 Lockout Reset Off = 0
Emergency Restart
S4 CONTROLS
Reset Input
Reset Off = 0
AND
OR
KEYPAD RESET
SETTING
RUN
BF/ WELDED CURRENT
I > PICKUP
b
I > PICKUP
a
BF/WELDED TIME DELAY2
SETTING
t
PKP
0
LOGIC OPERAND
WELDED ALARM PKP BF ALARM PKP
BREAKER FAILURE
State: Operate
TARGET MESSAGE
BREAKER FAILURE
State: Pickup
TARGET MESSAGE
WELDED CONTACTOR
State: Pickup
WELDED CONTACTOR
State: Operate
SETTING
Disabled = 0
BF FUNCTION/WELDED CONT FUNC
OR
896824A1.cdr
SETTING
SWITCHING DEVICE Breaker
Contactor
S2 SYSTEM SETUP
I > PICKUP
c
OR
AND
AND AND
AND AND
AND
AND
OR
OR
AND AND
SETTING
Off = 0
BF EXT INITIATE/WELDED EXT INI
INPUT
BF/WELDED EXT INITIATE INPUT TRIP
From Protection Operation
OR
AND
BF/WELDED TIME DELAY1
SETTING
t
PKP
0
Latched Alarm
Alarm
Phase A Current (I )
a
Phase B Current (I )
b
Phase C Current (I )
c
OUTPUT RELAYS
Do Not Operate, Operate
OUTPUT RELAY X