Electrical Checks; Test Generator Under Load - Generac Power Systems RD015 Owner's Manual

Activation and Startup
3.8.3— Electrical Checks
Complete electrical checks as follows:
Verify that the generator is OFF. A red LED on the control pad illuminates to confirm that the system is in the OFF
1.
mode.
Verify that the Main Circuit Breaker switch on the generator control panel is in the OFF (Open) position.
2.
Turn OFF all circuit breakers/electrical loads that will be powered by the generator.
3.
Turn on the utility power supply to the transfer switch using the means provided (such as a utility main line circuit
4.
breaker).
+
The transfer switch is now electrically "hot." Contact with "hot" parts will result in extremely hazard-
ous and possibly fatal electrical shock.
Use an accurate AC voltmeter to check utility power source voltage across transfer switch terminals N1, N2, and
5.
N3 (if three phase). Normal line-to-line voltage should be equivalent to rated unit voltage.
Check utility power source voltage across terminals N1, N2, and N3 (if three phase) and the transfer switch neu-
6.
tral lug.
When certain that utility supply voltage is compatible with transfer switch and load circuit ratings, turn OFF the
7.
utility power supply to the transfer switch.
Press MANUAL on the control pad to crank and start the engine.
8.
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 pad to shut the engine down.
13.
+
Do not proceed unless certain that generator AC voltage and frequency are correct and within the
stated limits.
3.8.4— 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 pad illuminates to confirm that the system is in the OFF
1.
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.
16 Owner's Manual for Stationary Diesel Generators