Multilin 469 Motor Management Relay ... - GE Digital Energy

CHAPTER 6: ACTUAL VALUES
6.4 A3 Learned Data
6.4.1 Motor Starting
PATH: ACTUAL VALUES A3 LEARNED DATA MOTOR STARTING
MOTOR [
]
STARTING
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
LEARNED ACCELERA-
TION
TIME: 0.0 s
LEARNED STARTING
CURRENT: 0 A
LEARNED STARTING
CAPACITY: 0% used
LAST ACCELERATION
TIME: 0.0 s
LAST STARTING
CURRENT: 0 A
LAST STARTING
CAPACITY: 0% used
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%
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 acceleration time, last starting current, and last starting
capacity. This information can be reset to default using the S1 469 SETUP INSTALLATION
RESET MOTOR INFORMATION settings.
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 average 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 Start Inhibit on page 5–66 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.
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 6–27