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AR-EXP-CUMMINS-07-00 OWNERS MANUAL
Page 18
6. PRE-OPERATION CHECK
Before starting, complete the following:
1. Set the generator's Start/stop switch to the
Stop position.
2. Turn OFF the utility power supply to the transfer
switch using the means provided (such as the
utility main line circuit breaker).
3. Check the engine crankcase oil level and, if necessary,
fill to the dipstick FULL mark with the recommended
oil. Do not fill above the FULL mark.
4. Check the fuel supply. All fuel shutoff valves in the fuel
supply lines must be open.
Never operate the engine with the oil level
below the “Add” mark on the dipstick. Doing
this could damage the engine.
6.1. Electrical Checks.
Complete electrical checks as follows:
1. Turn on the utility power supply to the transfer switch
using the means provided (such as a utility main line circuit
breaker).
The transfer switch is now electrically “hot.”
Contact with “hot” parts will result in extremely
hazardous and possibly fatal electrical shock.
Proceed with caution.
2. Use an accurate AC voltmeter to check utility power
source voltage across terminals.
3. Check utility power source voltage across terminals and
the transfer switch neutral lug; then across second terminal
and neutral. Nominal line-to neutral voltage should be 120
volts AC.
4. When certain that utility supply voltage is compatible with
transfer switch and load circuit ratings, turn OFF the utility
power supply to the transfer switch.
5. Set the generator's main circuit breaker to its OFF (or
open) position. Initial tests will be conducted at no-load
condition.
6. On the generator panel Start/stop switch to the to start
position The engine should crank and start when the re-
mote start input is activated.
7. Let the engine warm up for about five minutes to
allow internal temperatures to stabilize. Then, set
the generator’s main circuit breaker to its ON (or closed)
position.
Proceed with caution! Generator power voltage
is now supplied to the transfer switch. Contact
with live transfer switch parts will result in
dangerous and possibly fatal electrical shock.
8. Connect an accurate AC voltmeter and an AC frequency
meter across transfer switch terminal lugs and voltage and
frequency of the unit must be accord to the specifications
of the generator.
9. Connect the AC voltmeter test leads across terminal
Lugs and neutral, one by one.
10. Set the generator’s main circuit breaker to its OFF (or
open) position. Let the engine run at no load for a few min-
utes to stabilize internal engine generator temperatures.
11. Set the generator's Start/stop switch to stop position.
The engine should shut down.
NOTE:
It is important that you DO NOT proceed until you are cer-
tain 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. If frequency is correct, but voltage is high or
low, the generator’s voltage regulator requires adjustment.
6.2. GENERATOR TESTS UNDER LOAD
To test the generator set with electrical loads applied, pro-
ceed as follows:
1. Set generator’s main circuit breaker to its OFF (or open)
position.
2. Set the generator's Start/stop switch to OFF.
3. Turn OFF the utility power supply to the transfer switch,
using the means provided (such as a utility main line circuit
breaker).
Do not attempt manual transfer switch operation
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.
4. Manually set the transfer switch to the STANDBY posi-
tion, i.e., load terminals connected to the generator's termi-
nals. The transfer switch operating lever should be down.
5. Set the generator's Start/stop switch to MANUAL. The
engine should crank and start immediately.
6. Let the engine stabilize and warm up for a few minutes.
7. Set the generator’s main circuit breaker to its ON (or
closed) position. Loads are now powered by the standby