GE 339

6–60 339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Load increase alarm (50L)
The Load Increase Alarm is used to alarm abnormal load increases that may indicate
problems with the process. An alarm is enabled only after the acceleration stage is
complete and the motor has entered the running stage. Once enabled, the alarm is
generated when the motor load exceeds the setting LOAD INCR PKP for the time delay
specified by the setting LOAD INCR DELAY, and automatically resets when the current has
subsided.
PATH:
SETPOINTS > S3 PROTECTION > LOAD INCR ALARM
LOAD INCR FUNC
Range: Disabled, Enabled
Default: Disabled
For details see Common setpoints
.
LOAD INCR PKP
Range: 50% to 150% FLA in steps of 1% FLA
Default: 150% FLA
This setting specifies the pickup threshold for the Load Increase Alarm.
LOAD INCR DELAY
Range: 0.00 to 60.00 s in steps of 0.01 s
Default: 1.50 s
This setting specifies the time delay for the Load Increase Alarm.
OUTPUT RELAY X
For details see Common setpoints
.
BLOCK 1 to 3
For details see Common setpoints
.
Figure 6-26: Load Increase logic diagram
BLOCK 1
BLOCK 2
BLOCK 3
OFF=0
OFF=0
OFF=0
SETTINGS
OR
Running
MOTOR STATUS
LOAD INCR ALARM
SETTING
Enabled = 1
AND
LOAD INCR PKP
SETTING
Iavg > Pickup
RUN
LOAD INCR DELAY
SETTING
t
PKP
0
LOAD INCR OP
LOAD INCR PKP
LOGIC OPERAND
ANY ALARM OP
ANY ALARM PKP
Load Incr Alarm
State: Operate
TAR GET MESSAGE
Load Incr Alarm
State: Pickup
896818.cdr
Disabled = 0