Learned Data - GE MM200 Instruction Manual

LEARNED DATA

Learned data
5–2
The MM200 learns the acceleration time, the starting current, the starting capacity, and
the average motor load during motor starts. This data is accumulated based on the last
five successful starts.
Learned Acceleration Time
Range: 0.0 to 200.0 ms in steps of 0.1 s
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
greatest 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
Range: 0.0 to 10000.0 A in steps of 0.1 A
The 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 five successful starts. If
there are less than five starts, a value of 0 seconds will be averaged in for the full five
starts.
Learned Starting Capacity
Range: 0 to 100% in steps of 1
The learned starting capacity is used to determine if there is enough thermal capacity to
permit a start. If there is not enough thermal capacity available for a start, a start inhibit
will be issued. Starting will be blocked until there is sufficient thermal capacity available.
MM200 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: DIAGNOSTICS