Test Generator Under Load; Check Automatic Operation - Generac Power Systems 22 kW Owner's Manual

Activation and Startup
Allow the engine to warm up for about five minutes. Move the Main Circuit Breaker switch on the generator con-
9.
trol panel up to the ON (or closed) position.
+
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.
Connect an accurate AC voltmeter and a frequency meter across transfer switch terminal lugs E1, E2, and E3 (if
10.
three phase).
Successively connect the AC voltmeter test leads across terminal lugs E1, E2, and E3 (if three phase) and neu-
11.
tral; then across E2 and neutral. Voltage reading in each case should match utility voltage reading. If system is
three phase, verify that generator phase rotation matches utility phase rotation.
Move the Main Circuit Breaker switch on the generator control panel down to the OFF (Open) position.
12.
Press OFF on the control panel to shut the engine down.
13.
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Do not proceed unless certain that generator AC voltage and frequency are correct and within the
stated limits.
3.7.4— Test Generator Under Load
To test the generator set with electrical loads applied, proceed as follows:
Verify that the generator is OFF. A red LED on the control panel illuminates to confirm that the system is in the
1.
OFF mode.
Turn OFF all breakers/electrical loads that will be powered by the generator.
2.
Turn OFF the utility power supply to the transfer switch, using the means provided (such as a utility main line cir-
3.
cuit 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.
Manually set the transfer switch to the STANDBY position, i.e., load terminals connected to the generator's E1,
4.
E2, and E3 (if three phase) terminals.
Press MANUAL on the control panel. The engine will crank and start.
5.
Allow the engine to warm up for a few minutes.
6.
Move the Main Circuit Breaker switch on the generator control panel up to the ON (or closed) position. The
7.
switch is now powered by the standby generator.
Turn ON the circuit breaker/electrical loads powered by the generator.
8.
Connect a calibrated AC voltmeter and a frequency meter across terminal lugs E1, E2, and E3 (if three phase).
9.
Voltage should be approximately unit rated voltage. Check with clamp on amp meter to ensure unit is not over-
loaded.
Let the generator run at full rated load for 20-30 minutes. Listen for unusual noises, vibration or other indications
10.
of abnormal operation. Check for oil leaks, evidence of overheating, etc.
When testing under load is complete, turn OFF electrical loads.
11.
Move the Main Circuit Breaker switch on the generator control panel up to the OFF (or open) position.
12.
Allow the engine to run at no-load for 2-5 minutes.
13.
Press OFF on the control panel to shut the engine down. A red LED illuminates to confirm that the system is in
14.
the OFF mode.
3.7.5— Check Automatic Operation
To check the system for proper automatic operation, proceed as follows:
16 Owner's Manual for Stationary Emergency Generators