Synchronous Slip; Stall Time; Run Time - GE SPM Series Instruction Manual

5 SETPOINTS
SYNC SLIP: 5.0%
ENTER to modify
FUNCTION:
The value stored here is the slip at which the SPM will close the field contactor (FAR). It is expressed as per-
cent slip.
MOTOR TYPE:
Collector-Ring
EXAMPLE:
To close the field contactor (apply the field) when the motor reaches 94.5% of synchronous speed, the SYNC
SLIP setpoint is determined as follows:
100% speed – 94.5% speed = 5.5% sync slip
STALL TIME: 10 s
ENTER to modify
FUNCTION:
This setpoint determines the allowable time that power may be applied to the motor during locked rotor condi-
tions. This information may normally be found on the motor control data sheet available from the motor manu-
facturer.
MOTOR TYPE:
Collector-Ring and Brushless
RUN TIME: 1.05 x ST
ENTER to modify
FUNCTION:
Run time is the time that the motor may run at 50% speed and is expressed as a multiple of the allowable
motor stall time.
MOTOR TYPE:
Collector-Ring
EXAMPLE:
If the motor stall time is 10 seconds and RUN TIME is set to 3.00, then then the motor can run at:
3.00 × 10 sec. = 30 seconds at 50% speed
GE Power Management
Range: 0.5 to 10%
Step: 0.1%
Range: 1 to 40 seconds
Step: 1
Range: 1.05, 1.46, 2.05, 3.00 x
SPM Synchronous Motor Protection & Control
5.2 SETPOINTS MENU

5.2.10 SYNCHRONOUS SLIP

STALL TIME

5.2.11 STALL TIME
5

5.2.12 RUN TIME

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5