Single Unit Operation
Initial Start-Up
Before initial startup, megger test main stator winding.
Refer to Service Manuals SENR2180 or SENR7968.
1. Remove the left side access panel of the generator.
2. Loosen the locknuts on the voltage droop, voltage
level, and voltage gain controls.
3. Turn the voltage droop control (1) counterclockwise
to zero droop and tighten the locknut.
VOLTAGE ADJUSTMENT
CONTROLS
(SR4 Generator Shown)
1. Voltage Droop 2. Voltage Level 3. Voltage Gain
4. Circuit Breaker (SR4 Generator Only)
4. Turn the gain control (3) counterclockwise to zero,
then turn the gain control to about 1/4 of full range of
clockwise travel.
5. Perform required maintenance on engine before
starting.
6. Start the engine and allow it to warm.
7. Increase engine speed to full governed speed (high
idle).
8. Observe the voltmeter reading. If desired voltage is
not indicated, set no load voltage with voltage level
control (2).
9. Close the load circuit breaker and apply full load
gradually. Adjust governor control until nameplate
frequency is on the Hertz meter.
10. a. If voltmeter reading increases with full load
applied, turn gain control (3) slightly in counterclockwise
direction.
b. If voltmeter reading decreases with full load applied,
turn gain control (3) slightly in clockwise direction.
11. Remove load, adjust voltage level control (2) if
necessary to obtain desired voltage.
12. Apply the load, observe voltmeter reading. Repeat
steps 9 thru 12 until no load voltage equals full load
voltage.
13. Tighten the locknuts on all controls and install the
access panel of the generator.
14. Circuit breaker (4) will open if excessive field current
should occur. Push to reset the circuit breaker. If
breaker opens again, contact your Caterpillar dealer.
Starting
1. Make all preliminary engine starting checks.
2. Be sure the main or line circuit breaker is open.
3. Start the engine and allow it to warm up.
4. Adjust to full load RPM.
5. Close the main circuit breaker.
6. Apply the load. Do not try to apply full load in one
move, rather apply the load in increments to maintain
system frequency at a constant level.
7. Readjust governor for rated frequency.
Stopping
1. Remove the load in increments.
2. Open the circuit breaker
3. Allow the engine to run for 5 minutes to cool.
4. Stop the engine.
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