A3 Learned Data; Motor Starting; Average Motor Load - GE 469 Manual

5 ACTUAL VALUES

5.4 A3 LEARNED DATA

S MOTOR STARTING
S [ENTER] for more
The 469 learns the acceleration time, the starting current, as well as, the thermal capacity required during
motor starts. This data is accumulated based on the last five starts. The 469 also keeps statistics for last accel-
eration time, last starting current, and last starting capacity. This information can be reset to default using the
S1 469 SETUP \ INSTALLATION \ RESET MOTOR INFORMATION setpoint.
If motor load during starting is relatively consistent, the LEARNED ACCELERATION TIME may be used to fine tune
the acceleration protection. Learned acceleration time will be the longest time of the last five successful starts.
The time is measured from the transition of motor current from zero to greater than overload pickup, until line
current falls below the overload pickup level.
LEARNED STARTING CURRENT is measured 200 ms after the transition of motor current from zero to greater than
overload pickup. This should ensure that the measured current is symmetrical. The value displayed is the aver-
age of the last 5 successful starts. If there are less than 5 starts, 0s will be averaged in for the full 5 starts.
The LEARNED STARTING CAPACITY is used to determine if there is enough thermal capacity to permit a start (refer
to Section 4.8.2: START INHIBIT on page 4–54 for more information on start inhibit). If there is not enough
thermal capacity for a start, a start inhibit will be issued. Starting will be blocked until there is sufficient thermal
capacity.
S AVERAGE MOTOR LOAD
S [ENTER] for more
The 469 can learn the average motor load over a period of time. This time is specified by the S1 469 SETUP \
PREFERENCES \ AVERAGE MOTOR LOAD CALC. PERIOD setpoint (default 15 minutes). The calculation is a sliding
window and is ignored during motor starting.
GE Power Management
ð
LEARNED ACCELERATION
ENTER
TIME: 0.0 s
ESCAPE
LEARNED STARTING
ESCAPE
CURRENT: 0 A
MESSAGE
LEARNED STARTING
ESCAPE
CAPACITY: 0% used
MESSAGE
LAST ACCELERATION
ESCAPE
TIME: 0.0 s
MESSAGE
LAST STARTING
ESCAPE
CURRENT: 0 A
MESSAGE
LAST STARTING
ESCAPE
CAPACITY: 0% used
MESSAGE
ð

AVERAGE MOTOR LOAD

ENTER
LEARNED: 0.00 x FLA
ESCAPE
469 Motor Management Relay
5.4 A3 LEARNED DATA
Range: 0.0 to 200.0 sec.
Range: 0 to 50000 A
Range: 0 to 100%
Range: 0.0 to 200.0 sec.
Range: 0 to 50000 A
Range: 0 to 100%
5.4.2 AVERAGE MOTOR LOAD
Range: 0.00 to 20.00

5.4.1 MOTOR STARTING

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