Section 3 —
Guardian
3.1BEFORE INITIAL START-UP
Before starting, complete the following:
1.Set the generator's Auto/Off/Manual switch to the OFF 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 neces- sary, fill to the dipstick FULL mark with the rec- ommended oil. Do not fill above the FULL mark.
4.Check the fuel supply. Gaseous fuel lines must have been properly purged and leak tested in accordance with applicable
Never operate the engine with the oil level below the “Add” mark on the dipstick. Doing this could damage the engine.
3.2CHECK TRANSFER
SWITCH OPERATION
Refer to Section 2.4 (Page 19) for manual operation procedures.
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.
3.3ELECTRICAL CHECKS
Complete electrical checks as follows:
4.When certain that utility supply voltage is com- patible with transfer switch and load circuit rat- ings, 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 con- ducted at
6.On the generator panel, set the Auto/Off/Manual switch to MANUAL. The engine should crank and start.
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 fre- quency meter across transfer switch terminal lugs E1 and E2. Voltage should be
9.Connect the AC voltmeter test leads across termi- nal lug E1 and neutral; then across E2 and neu- tral. In both cases, voltage reading should be 121- 126 volts AC.
10.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.
11.Set the generator's Auto/Off/Manual switch to OFF. The engine should shut down.
NOTE:
It is important that you DO NOT proceed until you are certain that generator AC voltage and frequen- cy are correct and within the stated limits.
1.Turn on the utility power supply to the transfer switch using the means provided (such as a utili- ty 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 N1 and N2. Nominal
3.Check utility power source voltage across termi- nals N1 and the transfer switch neutral lug; then across terminal N2 and neutral. Nominal
Generally, if both AC frequency and voltage are high or low, the engine governor requires adjust- ment. If frequency is correct, but voltage is high or low, the generator’s voltage regulator requires adjustment.
3.4GENERATOR 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.Set the generator's Auto/Off/Manual switch to OFF.
3.Turn OFF the utility power supply to the transfer switch, using the means provided (such as a util- ity main line circuit breaker).
22 Generac® Power Systems, Inc.
