Install Manual

Control Panel Start-Up/Testing
34 Installation Guidelines For 60 Hz Air-Cooled Generators
Electrical Checks
Proceed as follows to complete electrical checks:
1. Verify that the generator is off.
2. Set the generator main circuit breaker to OFF
(OPEN).
3. Turn off all circuit breakers/electrical loads that will
be supplied by the generator.
4. Turn on the utility power supply to the transfer
switch using the means provided (such as a utility
main line circuit breaker).
5. Use a calibrated AC voltmeter to check utility
power source voltage across transfer switch
terminals N1 and N2. Nominal line-to-line voltage
should be 240 volts AC. If voltage is not correct,
verify AC output and wiring from utility source to N1
and N2 lugs at transfer switch.
6. Check utility power source voltage across
terminals N1 and the transfer switch neutral lug;
then across terminal N2 and neutral. Nominal line-
to-neutral voltage should be 120 volts AC (if wired
with a neutral). If voltage is not correct, verify AC
output and wiring from utility source to N1 and N2
lugs at transfer switch.
7. Turn off the utility power supply to the transfer
switch when certain that utility supply voltage is
compatible with transfer switch and load circuit
ratings.
8. Push the MANUAL button on the generator panel.
The engine will crank and start. Record cranking
gas pressure: ______________.
9. Let the engine warm up for approximately five
minutes to allow internal temperatures to stabilize.
Then set the generator MLCB (generator
disconnect) to ON (CLOSED). Record running gas
pressure: ______________.
10. Connect a calibrated accurate AC voltmeter and a
frequency meter across transfer switch terminal
lugs E1 and E2. Voltage should be 238–242 at a
frequency of 59.5–60.5 Hz. If voltage is not correct,
verify that the MLCB (generator disconnect) is
closed and verify AC output and frequency (Hertz
or Hz) at the MLCB. Also verify wiring from
generator to E1 and E2 lugs at transfer switch.
11. Connect the AC voltmeter test leads across
terminal lugs E1 and neutral; then across E2 and
neutral (if wired with a neutral). In both cases,
voltage reading should be 119–121 volts AC. If
voltage is not correct, verify that the MLCB
(generator disconnect) is closed and verify AC
output between the E1 and E2 of the MLCB
(generator disconnect) and neutral at the
generator.
12. Verify wiring from generator to E1, E2, and neutral
lugs at transfer switch.
13. Set the generator MLCB (generator disconnect) to
OFF (OPEN).
14. Push the generator OFF button. The engine will
shut down.
NOTE: It is important not to proceed until certain that the
generator AC voltage and frequency are correct and
within the stated limits.
Generator Tests Under Load
Proceed as follows to test the generator set with
electrical loads applied:
1. Verify that the generator is off.
2. Turn off all breakers/electrical loads that will be
powered by the generator.
3. Turn off the utility power supply to the transfer
switch, using the means provided (such as a utility
MLCB [generator disconnect]).
4. Manually set the transfer switch to STANDBY, i.e.,
load terminals connected to the generator’s E1/E2
terminals. The transfer switch operating lever
should be down.
5. Push the generator MANUAL button. The engine
will crank and start immediately.
6. Allow the engine to stabilize and warm up for a few
minutes.
7. Set the generator MLCB (generator disconnect) to
ON (CLOSED). Loads are now powered by the
standby generator.
8. Turn on the circuit breakers/electrical loads that are
powered by the generator one by one.
9. Connect a calibrated AC voltmeter and a frequency
meter across terminal lugs E1 and E2. Voltage
should be approximately 240 volts and frequency
should be approximately 60 Hz. If the voltage and
frequency are rapidly dropping as the loads are
applied, the generator may be overloading, or
there may be a fuel issue. Check amperage value
of loads and/or fuel pressure.
10. 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.
(000129)
DANGER
Electrocution. High voltage is present at
transfer switch and terminals. Contact with live
terminals will result in death or serious injury.
(000132)
DANGER
Electrocution. Do not manually transfer under load.
Disconnect transfer switch from all power sources
prior to manual transfer. Failure to do so will result
in death or serious injury, and equipment damage.