GE 339

CHAPTER 6: SETPOINTS S3 PROTECTION
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 6–109
Figure 6-46: High Speed Undercurrent logic diagram
896817A1.CDR
S3 HIGH SPEED U/CURR
MOTOR STATUS Stopped
AND
IA_mag < PICKUP
S3 HIGH SPEED U/CURR
U/CURR TRIP PKP
RUN
IB_mag < PICKUP
IC_mag < PICKUP
IA_mag < PICKUP
S3 HIGH SPEED U/CURR
U/CURR ALARM PKP
RUN
IB_mag < PICKUP
IC_mag < PICKUP
OR
OR
S3 HIGH SPEED U/CURR
U/CURR ALARM DELAY
t
PKP
0
LOGIC OPERAND SPD2 U/C TRIP OP ANY TRIP OP
S3 HIGH SPEED U/CURR
U/CURR TRIP DELAY
t
PKP
0
LOGIC OPERAND SPD2 U/C ALARM OP ANY ALARM OP
S R
LATCH
AND
AND
S3 HIGH SPEED U/CURR
U/CURR TRIP FUNC
ENABLED = 1
S3 HIGH SPEED U/CURR
BLK U/C ON START
t
BLK
0
BLOCK 1 BLOCK 2 BLOCK 3
OFF = 0 OFF = 0 OFF = 0
OR
S3 HIGH SPEED U/CURR U/CURR ALARM FUNC ENABLED = 1
IA
ACTUAL VALUE
IB
IC
Running
S2 MOTOR ENABLE 2-SPD MOTOR DISABLED = 0 MOTOR SPEED INDICATION HIGH SPEED
AND
SPD2 U/C TRIP PKP
SPD2 U/C ALARM PKP
SETTINGS SETTINGS
SETTINGS
SETTING
SETTINGS
SETTINGS
SETTING
SETTINGS
SETTINGS
TARGET MESSAGE SPD2 U/C Alarm State: Operate SPD2 U/C State: Pickup
Alarm
TARGET MESSAGE SPD2 U/C State: Operate
Trip
SPD2 U/C Trip State: Pickup
OR
AND
AND
INPUTS
Emergency Restart Input Lockout Reset Input
SETTINGS
Off = 0 Lockout Reset Off = 0 Emergency Restart
S4 CONTROLS
ANY ALARM PKP
ANY TRIP PKP
KEYPAD RESET
AND
Reset Input
Reset Off = 0
DISABLED = 0
DISABLED = 0
SETTINGS
OUTPUT RELAY X Do Not Operate, Operate