Generac Power Systems 91355 - Manual (Page 25)

POST INSTALLATION TESTS
The air cooled generator set was factory tested and
adjusted to provide maximum power. You should not
be required to adjust the unit any further except under
special circumstances.
WARNING: DO NOT MAKE ANY UNNECESSARY
ADJUSTMENTS. FACTORY SETTINGS ARE COR­
RECT FOR MOST APPLICATIONS. WHEN MAKING
ADJUSTMENTS, HOWEVER, BE CAREFUL TO
AVOID OVERSPEEDING THE ENGINE.
BEFORE INITIAL START UP
Before starting, complete the following:
1. Check engine crankcase oil level and, if necessary, fill to
dipstick FULL mark with the recommended oil. Do not fill
above FULL mark.
2. Check the fuel supply. Gaseous fuel lines must have
been properly purged and leak tested in accordance with
applicable fuel-gas codes. All fuel shutoff valves in the
fuel supply lines must be open.
DANGER: IF AN LP (PROPANE) GAS FUEL SYS­
TEM HAS BEEN INSTALLED, IT MUST HAVE BEEN
PROPERLY TESTED FOR LEAKS BEFORE OPER­
ATING THE SYSTEM IN COMPLIANCE WITH ANSI
A119.2/NFPA 501C. NO LEAKAGE IS PERMIHED.
YOU MUST BE SURE NO GASEOUS FUEL
VAPORS ENTER THE VEHICLE INTERIOR.
INITIAL START
When absolutely certain that the unit has been prop­
erly installed and prepared for use, start the engine as
follows:
1. Turn off all electrical loads. Do this by setting the generator
main circuit breakers to their “OFF or “OPEN” position.
2. Refer to the Owner's Manual shipped with unit for crank­
ing and starting instructions. The engine may require
more cranking for initial starting since the fuel lines have
to be primed.
3. Let the engine warm up for about five minutes to allow
internal temperatures to stabilize.
4. Carefully inspect the engine-generator for fuel, oil and
exhaust system leaks. Before proceeding to the next
step, correct any leakage immediately.
5. When engine has stabilized and warmed up, check the
no-load voltage and frequency. See “Checking No-Load
Voltage and Frequency”. Initial tests and adjustments are
done at no-load condition.
6. When all tests and adjustments at no-load are completed,
apply electrical loads and check for proper operation
under load. See “Testing Under Load”. Run the unit at
least 30 minutes with loads applied.
7. Turn off all electrical loads by setting the generator main
circuit breakers to “OFF or “OPEN.”
8. Let the unit run at no-load for a few minutes to stabilize
internal engine-generator temperatures. Then, shut down
the engine.
IMPORTANT: THE GENERATOR SET WAS THOR­
OUGHLY TESTED AND ADJUSTED AT THE FAC­
TORY
BEFORE SHIPPING. NO ADDITIONAL
ADJUSTMENT SHOULD BE NECESSARY. ONLY
QUALIFIED SERVICE TECHNICIANS WHO HAVE
BEEN TRAINED SHOULD PERFORM ADJUST­
MENTS OUTLINED IN THIS MANUAL.
CHECKING NO’LOAD VOLTAGE
AND FREQUENCY
Connect an accurate AC voltmeter and an AC fre­
quency meter across the generator’s AC output leads.
This can be done at a convenient point in the circuit
(such as the transfer switch terminals or isolating
receptacle). Connect the meters across lines T1 (red)
and T2 (white); or across line T3 (black and T2
(white). Line-to-neutral readings will be taken with
unit at no-load condition.
t.With generator running, stabilized and warm, check the
AC frequency and voltage. Frequency shoud be about 62
Hz; voltage about 122-126 volts AC.
2. After taking frequency and voltage readings, determine if
any adjustment is required as follows:
• If frequency and voltage are both good, no adjust­
ment IS needed.
• If frequency is high or low, adjust the engine gov­
ernor to obtain 62 Hertz at no-load. Then, recheck
voltage reading.
• If frequency is good but voltage is high or low,
adjust the voltage regulator to obtain 124 volts at
62 Hz (no-load).
NOTE: If the generator has been reconnected to pro­
vide a dual voltage AC output (Page 18), line-to-line
frequency and voltage readings may be used.
Frequency at no-load should be about 62 Hz; line-to-
line voltage should be about 244-252 volts.
TESTING UNDER LOAD
After it has been determined that no-load frequency
and voltage are correct, apply electrical loads equal to
about 75-100% of the unit s rated wattage/amperage
capacity.
Check frequency with electrical load
applied. The frequency should not drop below about
58 Hz under load.
Let the unit run at least 30 minutes with load applied.
During this part of the test, check that the unit is not
running excessively hot and that adequate cooling air
flow is available. You must not allow the unit to over­
heat during prolonged operation.
23
—