PLATE 7E4661 - Caterpillar

Chapter 3. Operation and Adjustment
Initial Pre-Start Settings
-READ FULL PROCEDURERead this entire procedure before starting the prime mover.
CAUTION-DO NOT TURN POTS BEYOND THEIR STOPSThe Rated Speed Potentiometer is the only multi-turn pot in this control. All other pots are single-turn. Take care not to turn these pots beyond their stops.
1. RATED SPEEDA. Set the RATED SPEED potentiometer to minimum (fully counterclockwise).B. Set the external Speed Trim, if used, to mid-position.2. RESET- Set at mid-position.3. GAIN- Set at mid-position.4. RAMP TIME- Set at maximum (fully clockwise- be careful not to overtorque the pot ).5. LOW IDLE SPEED- Set at maximum (fully clockwise- be careful not to overtorque the pot ).6. LOAD GAIN- Set at mid-position.7. DROOP- Set at minimum (fully counterclockwise- be careful not to overtorque the pot ).8. ACTUATOR COMPENSATION.A. Set the ACTUATOR COMPENSATION potentiometer at 2 on the 0 to 10 potentiometer scale for diesel, gas turbine, or fuel-injected gasoline prime movers.B. Set the ACTUATOR COMPENSATION potentiometer at 6 on the 0 to 10 potentiometer scale for carbureted-gas or gasoline prime movers, and steam turbines.9. START FUEL LIMIT- Set at maximum (fully clockwise- be careful not to overtorque the pot ).10. Be sure the actuator is connected to terminals 20 and 21.Start-up Adjustments
1. Complete the installation checkout procedure in Chapter 2, and the initial prestart settings above.
CAUTION-SPEED RANGE SWITCHBe sure the speed range switch is set on the right speed range for your application as described in Chapter 2.
2. Close the Close for Rated contact. Set the control for isochronous operation by closing the droop contact. This is for initial prime mover start-up only. For normal start-up, the Close For Rated contact (open for idle/close for rated) should be open if the prime mover is to start at idle.3. Apply input power to the control.4. Preset rated speed.If a signal generator is not used, set the RATED SPEED potentiometer at minimum (fully counterclockwise).When using a signal generator to set rated speed, set the signal generator for the frequency of the speed sensor at rated speed, and connect it to terminals 28 and 29. (The rated speed frequency in Hz equals the rated prime mover speed in rpm times the number of teeth on the speed-sensing gear divided by 60.) Put the Close For Rated contact in the rated (closed) position. Set the speed trim potentiometer, if used, to mid-position. Connect a dc analog voltmeter to terminals 20 (+) and 21 (-) to read actuator voltage.If the actuator voltage is at minimum (minimum will be approximately 0 volts), slowly turn the RATED SPEED potentiometer clockwise (counterclockwise for reverse-acting controls) until the voltage just begins to move to maximum.If the actuator voltage is at maximum, slowly turn the RATED SPEED potentiometer counterclockwise (clockwise for reverse-acting controls) until the voltage just begins to move to minimum.Continue to very slowly adjust the RATED SPEED potentiometer in the appropriate direction, trying to stop the actuator voltage between the minimum and maximum voltages. Because it is not possible to stop the motion, cease adjusting