Generator Tests Under Load; Checking Automatic Operation - Generac 7 kW Manual Del Usuario

12. Set the generator's main circuit breaker to its
OFF (or OPEN) position. Let the engine run at no-
load for a few minutes to stabilize internal engine
generator temperatures.
13. Set the generator's AUTO/OFF/MANUAL switch to
OFF . The engine should shut down.
It is important not to proceed until certain that
generator AC voltage and frequency are correct
and within the stated limits. Generally, if both AC
frequency and voltage are high or low, the engine
governor requires adjustment* (*GH410 only). If
frequency is correct, but voltage is high or low, the
generator's voltage regulator requires adjustment.
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 breakers on the load center of the
transfer box (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 the load center of the transfer switch
(T1 and T2).
10. Connect an accurate AC voltmeter and a frequen-
cy meter across terminal lugs E1 and E2.
• 7kW voltage should be greater than 230 volts and
frequency should be greater than 58 Hz.
Section 2 — Post Installation Start-up and Adjustments
NOTE:
Air-cooled Generators
• 10, 13, 16 and 18kW voltage should be greater
than 240 volts and frequency should be greater
than 60 Hz.
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 generator's main circuit breaker to its ON
(or CLOSED) position.
7. Set the AUTO/OFF/MANUAL switch to AUTO. The
system is now ready for automatic operation.
8. 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 a 10 second delay. After
starting, the transfer switch should connect load cir-
cuits to the standby side after a 15 second delay. Let
the system go through its entire automatic sequence
of operation.
With the generator running and loads powered by
generator AC output, turn ON the utility power supply
to the transfer switch. The following should occur:
• After about 15 seconds, the switch should transfer
loads back to the utility power source.
• About one minute after retransfer, the engine
should shut down.
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