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Power Systems, Inc. 11
2.4 GENERATOR TESTS UNDER LOAD
To test the generator set with electrical loads applied,
proceed as follows:
1. Set generator’s main circuit breaker to its OFF
(or open) position.
2. Turn OFF all loads connected to the transfer
switch terminals T1 and T2.
3. Set the generator's Auto/Off/Manual switch
to OFF.
4. Turn OFF the utility power supply to the transfer
switch, using the means provided (such as a util-
ity main line circuit breaker).
Do not attempt manual transfer switch opera-
tion until all power voltage supplies to the
transfer switch have been positively turned off.
Failure to turn off all power voltage supplies
will result in extremely hazardous and possibly
fatal electrical shock.
5. Manually set the transfer switch to the STANDBY
position, i.e., load terminals connected to the
generator's E1/E2 terminals. The transfer switch
operating lever should be down.
6. Set the generator's Auto/Off/Manual switch to
MANUAL. The engine should crank and start
immediately.
7. Let the engine stabilize and warm up for a few
minutes.
8. Set the generator’s main circuit breaker to its ON
(or closed) position. Loads are now powered by
the standby generator.
9. Turn ON electrical loads connected to transfer
switch T1 and T2. Apply an electrical load equal
to the full rated wattage/amperage capacity of the
installed generator.
10. Connect an accurate AC voltmeter and a frequen-
cy meter across terminal lugs E1 and E2. Voltage
should be greater than 230 volts; frequency
should be greater than 58 Hertz.
11. Let the generator run at full rated load for 20-30
minutes. Listen for unusual noises, vibration or
other indications of abnormal operation. Check
for oil leaks, evidence of overheating, etc.
12. When testing under load is complete, turn OFF
electrical loads.
13. Set the generator's main circuit breaker to its
OFF (or open) position.
14. Let the engine run at no-load for a few minutes.
15. Set the Auto/Off/Manual switch to OFF. The
engine should shut down.
2.5 CHECKING AUTOMATIC
OPERATION
To check the system for proper automatic operation,
proceed as follows:
1. Set generator’s main circuit breaker to its OFF
(or open) position.
2. Check that the Auto/Off/Manual switch is set to
OFF.
3. Turn OFF the utility power supply to the transfer
switch, using means provided (such as a utility
main line circuit breaker).
4. Manually set the transfer switch to the UTILITY
position, i.e., load terminals connected to the util-
ity power source side.
5. Turn ON the utility power supply to the transfer
switch, using the means provided (such as a util-
ity main line circuit breaker).
6. Set the Auto/Off/Manual switch to AUTO. The sys-
tem is now ready for automatic operation.
7. Turn OFF the utility power supply to the transfer
switch.
With the Auto/Off/Manual switch at AUTO, the engine
should crank and start when the utility source power
is turned OFF. After starting, the transfer switch
should connect load circuits to the standby side. Let
the system go through its entire automatic sequence
of operation.
With the generator running and loads powered by gen-
erator AC output, turn ON the utility power supply to
the transfer switch. The following should occur:
• After about six seconds, the switch should transfer
loads back to the utility power source.
• About one minute after retransfer, the engine
should shut down.
2.6 ADJUSTING THE REGULATOR
(NATURAL GAS ONLY)
Although the generator has been factory set to pro-
vide maximum power, it may be necessary in some
areas to adjust this setting. Because natural gas has
different BTU or power content across the country
the engine may not perform as designed.
If you experience engine problems at high or full load
conditions follow these steps. It will require a fre-
quency meter to perform this procedure.
1. Turn off utility power to the main distribution
panel in the house. This can be done by switching
the service main breaker to the off or open posi-
tion.
2. Allow the generator to start. Before loading the
generator, confirm that the No Load Frequency,
with the roof open and door off, is set to 63-63.5
Hz. Transfer load to emergency circuits.
Section 2 — Post Installation Start-up and Adjustments
Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators