GE 339

CHAPTER 6: SETPOINTS S3 PROTECTION
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 6–63
Figure 6-27: Ground Fault logic diagram
LOGIC OPERAND GND FAULT TRIP OP ANY TRIP OP
LOGIC OPERAND GND FAULT ALARM OP ANY ALARM OP
S R
NV
LATCH
GND FAULT TRIP PKP
GND FAULT ALM PKP
TARGET MESSAGE Gnd Fault Alarm State: Operate
S
R
LATCH
Gnd Fault Alarm State: Pickup TARGET MESSAGE Gnd Fault Trip State: Operate Gnd Fault Trip State: Pickup
ANY ALARM PKP
ANY TRIP PKP
OR
GND ALARM ON START
SETTING
t
PKP
0
S3 GROUND FAULT GND ALARM ON RUN
SETTING
t
PKP
0
S3 GROUND FAULT
GND TRIP ON START
SETTING
t
PKP
0
S3 GROUND FAULT GND TRIP ON RUN
SETTING
t
PKP
0
S3 GROUND FAULT
OR
SETTING
RUN
GND ALARM PKP
Isg
>
PICKUP
Ig
>
PICKUP
S3 GROUND FAULT
SETTING
RUN
GND TRIP PKP
Isg
>
PICKUP
Ig
>
PICKUP
S3 GROUND FAULT
RUN RUN
OR
OR
AND AND AND AND
AND AND AND AND
MOTOR STATUS
Starting Running
896821A1.cdr
AND
AND
S3 GROUND FAULT
BLOCK 1 BLOCK 2 BLOCK 3
OFF = 0 OFF = 0 OFF = 0
OR
SETTINGS
S3 GROUND FAULT
GND ALARM FUNC
Enabled = 1
SETTINGS
S2 CURRENT SENSING
GROUND CT TYPE 5 A Secondary
1 A Secondary 50:0.025
SETTINGS
S3 GROUND FAULT
GND TRIP FUNC
Enabled = 1
SETTINGS
OR
LED: Lockout
Disabled = 0 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
SETTING
OUTPUT RELAY X
Do Not Operate, Opereate