IS200TPROS1CBB IS230TSPRH1C Gas turbine electrical manual

IS200TPROS1CBB IS230TSPRH1C Gas turbine electrical manual

For controls with actuator current of 20 to 160 mA, minimum fuel is defined as: • Actuator current less than 10 mA for forward-acting controls. • Actuator current greater than 180 mA reverse-acting controls. For controls with actuator current of 40 to 320 mA, minimum fuel is defined as: • Actuator current less than 20 mA for forward-acting controls. • Actuator current greater than 360 mA for reverse-acting controls. A contact to override the failed-speed-signal circuit can be connected in series with terminal 18 and terminal 16 (or terminal 0 on high voltage controls). Temporarily closing the contact overrides the failed-speed-signal circuit, which may be required for start-up.

Because of the variety of installations, plus system and component tolerances, the control must be tuned to each system for optimum performance. The potentiometers for setting and adjusting these circuits are located in the upper right corner of the control as shown in Figure 4-2. They include: • the RATED SPEED potentiometer • the START FUEL LIMIT potentiometer • RESET, GAIN, and ACTUATOR COMPENSATION • RAMP TIME and LOW IDLE SPEED potentiometers The RATED SPEED potentiometer is adjusted so that at rated speed, the converter-speed voltage and the reference-speed voltage are equal.

The START FUEL LIMIT

 potentiometer provides a means of limiting the fuel-rack position when starting diesel engines. Adjustment of the potentiometer sets the maximum actuator position desired. This limit position is automatically enabled prior to start-up, and is turned off when speed control takes over. RESET, GAIN and ACTUATOR COMPENSATION potentiometers adjust the control amplifier to accommodate various types of prime-mover systems. The RESET adjustment affects prime mover reaction time when recovering after a sudden load change. The magnitude of the speed change resulting from a sudden change in load is controlled by adjusting the GAIN. ACTUATOR COMPENSATION compensates for the time the actuator and prime mover system takes to react to signals from the control. The time taken by the prime mover to accelerate from idle to rated speed, and the recommended idle speed, are set with the RAMP TIME and LOW IDLE SPEED potentiometers respectively.

The main products

Spare parts spare parts, the DCS control system of PLC system and the robot system spare parts,

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