ABB PM866A-2 3BSE081230R1 controller module

Connect a single-pole, single throw switch to terminal 5 as shown on the appropriate plant-wiring diagram. Close the contact for rated, open for idle. Oil pressure is often used to close this contact. When closed, 10 to 40 Vdc is applied to terminal 5, and the prime mover can be operated at a speed higher than idle. When the contact is open, the voltage is removed from terminal 5, and the prime mover's speed decelerates to idle. The ramp rate applies only to the acceleration mode. When the ramp time potentiometer is full cw the ramp time from idle to rated is 22 ±4 seconds. When the ramp time potentiometer is fully ccw (be careful not to overtorque the pot), the ramp rate is less than 1 second from idle to rated. The ramp time from rated to idle is always less than 1 second, regardless of the setting of the ramp-time potentiometer.

Failed Speed Signal Override

 Circuits in the 2301A Speed Control constantly monitor the signal from the MPU. Should this signal be below a minimum threshold the control sends a minimum fuel signal to the actuator (maximum fuel signal on a reverse acting control).Before start-up of the prime mover, the speed signal is nonexistent, activating the failed speed signal circuit. On units with cranking motors, the cranking speed is usually sufficient to provide a speed signal, so an override contact is not needed for starting. On some steam turbine systems, the Close for Override of Failed Speed Signal contact must be closed to allow the actuator to open and provide steam for starting. The failed speed-signal override switch should be a momentary switch so the failed-speed-sensor circuit will be enabled after start-up.

Minimum Fuel Contact

The minimum-fuel contact between terminals 2 and 3 on the low-power models and 3 and 6 on the high-power models is intended as an optional means for a normal shutdown of the prime mover. The contact is connected as shown on the plant wiring diagram for the particular control. If a minimum fuel contact is not used, the terminals must be permanently jumpered.

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