GRILL AS-RADIATOR 4824142 - Caterpillar

External Adjustments
Speed Trim
A speed trim potentiometer or digital reference unit is connected to terminals 11 and 12. Use a high quality 100 ohm, 10-turn potentiometer (Woodward part 1657537 or equivalent) to provide about 5% speed adjustment. Terminals 11 and 12 must be jumpered if the speed trim potentiometer or digital reference unit is not used. The 2301A Speed Control will have a jumper installed in the factory and this must be removed if a speed-trim device is used.Droop Potentiometer
A 2K potentiometer may be connected to provide a maximum of about 8% droop. Connect the potentiometer (ccw) to terminal 15, (cw) to terminal 14, and wiper to terminal 13. If droop is not desired make no connections to terminals 13 and 14.Switch Options
Minimal Fuel Contact
The minimum-fuel contact between terminals 2 and 3 on the low-power models and 3 and 6 on the high-powered 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.
-EMERGENCY STOPDo NOT use the minimum-fuel contact as a part of any emergency stop sequence. The emergency may be caused by a governor malfunction which would also case a malfunction of the minimum-fuel feature. Use of the minimum-fuel contact for an emergency stop sequence could cause overspeed of the prime mover and mechanical damage and personal injury, including death.
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 in 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.Idle/Rated Ramp Contact
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 movers 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