GE DS200RTBAG3AEB Gas turbine module

Auxiliary Equipment The Woodward SPM-A synchronizer functions by biasing the output of the Load Sharing Module. All other Woodward auxiliary generating control equipment functions by biasing the voltage on the load-sharing lines. Pulse Width Modulation The Load Sharing Module output to the Caterpillar digital speed control engine is a frequency of 500 ± 100 Hz. The duty cycle ranges from a low of 10 percent for maximum decrease in load or speed to a high of 90 percent for maximum increase in speed or load. The duty cycle varies according to the magnitude of difference between the reference load and the actual power generation.

Troubleshooting

 The following trouble-shooting guide is an aid in isolating trouble to the Load Sharing Module, engine control, plant wiring, or elsewhere. The guide assumes that the system wiring, soldered connections, switch and relay contacts, and input and output connections are correct and in good working order. Make the checks in the order indicated. To prevent possible serious damage to the Load Sharing Module, do not attempt to service the unit beyond that described in the operating instructions. All other servicing should be referred to qualified service personnel.

Undesirable speed decrease with load increase.

Remove ground loops. Shield all wiring (load sharing lines, output to the speed control, speed trim pot, and SPM-A synchronizer input. Route wiring away from noise sources. Unstable system. Check system for proper operation. Unstable voltage regulator. Consult voltage regulator manufacturer’s manual for proper adjustment. Poor system stability. Reduce the load signal voltage of each unit in the system to three volts. Load Signal voltage is low. Adjusting LOAD Gain won't raise it. Incorrect phasing of CT and PT wiring. Perform phasing check. If phasing check indicates need, perform procedure for correct phase wiring.

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