GE SPM Series Instruction Manual

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GE SPM Series Instruction Manual Manual pdf 67 page image

GE Power Management SPM Synchronous Motor Protection & Control5- 115 SETPOINTS 5.3 OPTIONAL POWER FACTOR REGULATION SETPOINTS55.3.5 REGULATOR OUTPUT LIMITFUNCTION:This setpoint is the upper limit of the range of the control signal output voltage. This value must match the inputrange of the separate variable excitation equipment.MOTOR TYPE:Collector-RingNOTE:This value must be greater than or equal to the FLOOR VOLTS setpoint.5.3.6 FLOOR VOLTSFUNCTION:The floor value is the minimum limit for output control signal voltage that is connected to the field-rectifierequipment. The value programmed here is the exact output voltage from the SPM. For example, if the floor isprogrammed at 1.5 the SPM will output 1.5-volts minimum.MOTOR TYPE:Collector-RingNOTE: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 thefield cur-rent is drastically reduced.When the floor overrides the regulator, the power factor moves in a more leading condition than the regulatorsetpoint. As the load and/or system force the motor power factor toward the lagging condition such that thepower factor falls below the regulator setpoint, the regulator will once again take control and boost the fieldabove the floor so that the power factor will not dip below the setpoint. The power factor regulator must betuned during initial start-up. See section 6-6 for regulator tune up instructions.REG OUTPUT: 1 VENTER to modifyRange: 0 to 10 VStep: 1Dependent on the FLOOR VOLTSsetpoint.FLOOR VOLTS: 0.0ENTER to modifyRange: 0.0 to 10 VStep: 0.1