Digital guide
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Woodward 9907-896
Product Overview: The SPM-A Synchronizer biases the speed of an off-line generator set so that the frequency and phase match those of another generator or the utility bus. It automatically issues a contact closure signal to close the circuit breaker between the two when frequency and phase are matched within limits for a specified match-up time. The SPM-A is a phase-locked-loop synchronizer striving for a perfect match of frequency and phase. The SPM-A Synchronizer with voltage matching generates additional raise and lower signals (relay contact closures) to the generator’s voltage regulator, requiring voltages to match within the SPM-A’s tolerance before breaker closure occurs.
Detailed content
Technical Specifications:
- Input Voltage: 120 or 208/240 Vac
- Phase Window: 10 degrees
- Dwell Time: 1/8, 1/4, 1/2, or 1 second (internally switch selectable, factory set for 1/2 second)
- Voltage Match (with voltage matching model): 1% as standard
- Output Options: High impedance, low impedance, and EPG
Functional Features:
- Single-unit synchronization: Install one synchronizer on each generator to parallel individually to the bus.
- Multiple-unit synchronization: One synchronizer can synchronize up to seven paralleled generator units simultaneously to another bus.
- Select high impedance output for single-unit synchronization when the engine is controlled by a Woodward 2301 control.
- Select low impedance output for single-unit synchronization when the engine is controlled by a Woodward 2301A, 2500, or Electrically Powered Governor (EPG) control through a Generator Load Sensor.
- Use the EPG output when using a Woodward EPG control without load sensing.
Application Scenarios: Generator set paralleling, synchronization to utility bus or other generators in industrial power systems, marine power systems, and cogeneration plants.
Working Principle: The SPM-A Synchronizer checks the phase angle and frequency of the bus and an off-line generator which is to be paralleled. Signal conditioners amplify the bus and generator signals and apply them to the phase detector. A user-installed mode switch (single-pole, four-position) controls the relay driver, with the four positions being OFF, RUN, CHECK, and PERMISSIVE.
Installation Requirements: A user-installed mode switch (single-pole, four-position) must be wired to synchronizer contacts 10 through 13. Refer to the plant wiring drawing for detailed installation.
Usage Precautions: The engine, turbine, or other type of prime mover should be equipped with an overspeed shutdown device totally independent of the prime mover control system. Read the entire installation manual (Manual 82384 for complete installation, operation, maintenance, and certification information) before installing, operating, or servicing this equipment.
