GE 339

6–106 339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Figure 6-45: High Speed Short Circuit logic diagram
SETTING
Phase A current (IA)
RUN
SETTING
S/C FUNC Disabled = 0
Latched Alarm
S/C PKP
S/C DELAY
Phase B current (IB) Phase C current (IC)
Alarm
Phase Currents
Trip
SETTING
BLOCK 1: Off = 0 BLOCK 2: Off = 0 BLOCK 3: Off = 0
IB
>
PICKUP
IA
>
PICKUP
IC
>
PICKUP
SETTING
SPD2 S/C ALARM PKP
t
PKP
0
S R
LATCH
896819A1.cdr
LOGIC OPERAND
SPD2 S/C ALARM OP
LOGIC OPERAND
SETTING
S2 MOTOR Enable 2-spd Motor
Enabled = 1
MOTOR SPEED INDICATION
High Speed
OR
OR
AND
OR
AND
AND
AND
OR
SPD2 S/C Alarm State: Operate
TARGET MESSAGE
ANY ALARM OP
SPD2 S/C TRIP OP
ANY TRIP OP
S R
NV
LATCH
SPD2 S/C Trip State: Operate
TARGET MESSAGE
ANY ALARM PKP SPD2 S/C TRIP PKP ANY TRIP PKP
AND AND
OR
S3 HIGH SPEED S/C
S3 HIGH SPEED S/C
S3 HIGH SPEED S/C
AND
S3 HIGH SPEED S/C
OR
LED: Lockout
ANY LATCHED ALARM OP
SPD2 S/C State: Pickup
Alarm
TARGET MESSAGE
SPD2 S/C State: Pickup
Trip
Disabled = 0
OR
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
OR
AND
LOCKOUT OP
OUTPUT RELAY X
SETTINGS
Do Not Operate, Operate