GE SPM Series, Instruction Manual

Page: 67 / 126

GE Power Management SPM Synchronous Motor Protection & Control 5-
11
5 SETPOINTS 5.3 OPTIONAL POWER FACTOR REGULATION SETPOINTS
5
5.3.5 REGULATOR OUTPUT LIMIT
FUNCTION:
This setpoint is the upper limit of the range of the control signal output voltage. This value must match the input
range of the separate variable excitation equipment.
MOTOR TYPE:
Collector-Ring
NOTE:
This value must be greater than or equal to the FLOOR VOLTS setpoint.
5.3.6 FLOOR VOLTS
FUNCTION:
The floor value is the minimum limit for output control signal voltage that is connected to the field-rectifier
equipment. The value programmed here is the exact output voltage from the SPM. For example, if the floor is
programmed at 1.5 the SPM will output 1.5-volts minimum.
MOTOR TYPE:
Collector-Ring
NOTE:
This value must be less than or equal to the REG OUTPUT setpoint.
APPLICATION:
Certain conditions of operation require a floor so that the motor power factor will not become unstable if the
field cur-rent is drastically reduced.
When the floor overrides the regulator, the power factor moves in a more leading condition than the regulator
setpoint. As the load and/or system force the motor power factor toward the lagging condition such that the
power factor falls below the regulator setpoint, the regulator will once again take control and boost the field
above the floor so that the power factor will not dip below the setpoint. The power factor regulator must be
tuned during initial start-up. See section 6-6 for regulator tune up instructions.
REG OUTPUT: 1 V
ENTER to modify
Range: 0 to 10 V
Step: 1
Dependent on the
FLOOR VOLTS
setpoint.
FLOOR VOLTS: 0.0
ENTER to modify Range: 0.0 to 10 V
Step: 0.1