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Initial Start-up (No Load)
Before operating the generator or placing it into service,
inspect the entire installation carefully. Familiarize yourself
with the location of components and the location and
function of the generator controller. Begin testing the system
without any electrical loads connected, as follows:
1. Connect an accurate AC voltmeter/frequency meter to
the load side of the generator main circuit breaker.
NOTE
For 3-phase generators, use a phase rotation
meter to verify that output at the load side of the
circuit breaker matches utility power. On high-leg
delta systems, ensure that the high-leg position of the
generator matches the high-leg position of the utility
power.
2. Set the generator main circuit breaker to ON
(closed) position.
3. Start the generator.
When the generator is started for the first time, air in
the gaseous fuel lines will be purged. This may cause
the engine to run rough for a few minutes.
4. Listen for unusual noises, vibration, or other
indications of abnormal operation. Check for oil and
coolant leaks while the engine runs.
5. Let the engine warm up for 5 minutes.
6. Check generator output at load side of circuit breaker.
No-load voltage should be as shown in the chart
below. Frequency should be 59.8 - 60.2 Hz.
NOTE
If the no-load voltage is outside the specified
range, perform the AVR adjustment in Step 8. Do not
proceed until the AC voltage is within the specified
range.
1-Phase
3-Phase Wye
3-Phase Delta
3-Phase Wye
3-Phase Wye
3-Phase Wye
22
Phase-to-Phase
Voltage
Minimum
120/240
238
120/208
206
120/240
238
240/416
412
277/480
475
347/600
594
7. Check voltage output between each of the generator
connection lugs and the neutral lug. No-load voltage
should be as shown in the chart below.
8. If necessary, adjust the AVR as follows:
A. Connect voltmeter as described in step 1.
B. Remove the screws and the AVR cover.
C. While observing the voltmeter, adjust the
alternator voltage control (A) to obtain the range
specified. DO NOT adjust either of the other
alternator controls.
A
9. Reinstall the AVR cover and screws.
10. Stop the generator.
No-Load Voltage Table
Phase-to-Neutral
Maximum
Minimum
242
119
210
119
242
119
420
238
485
275
606
344
Maximum
121
121
121
242
279
350
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