Справочник Пользователя для Generac Power Systems 005240

  

13

Complete electrical checks as follows:

1.  Set the generator's main circuit breaker to its 

OFF (or OPEN) position.

2.  Set the generator's AUTO/OFF/MANUAL switch to 

the OFF position.

3.  Turn OFF all breakers on the load center of the 

transfer box (T1 and T2).

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 an accurate AC voltmeter to check utility 

power source voltage across transfer switch ter-
minals N1 and N2. Nominal line-to-line voltage 
should be 240 volts AC.

6.  Check utility power source voltage across termi-

nals N1 and the transfer switch neutral lug; then 
across terminal N2 and neutral. Nominal line-to-
neutral voltage should be 120 volts AC.

7.  When certain that utility supply voltage is compat-

ible with transfer switch and load circuit ratings, 
turn OFF the utility power supply to the transfer 
switch.

8.  On the generator panel, set the AUTO/OFF/ 

MANUAL switch to MANUAL. The engine should 
crank and start.

9.  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.



10. Connect an accurate AC voltmeter and a frequen-

cy meter across transfer switch terminal lugs E1 
and E2. 7kW voltage should be 242-252 volts at 
a frequency of 61-63 Hertz. 10, 13, and 16kW 
voltage should be 247-249 volts at a frequency of 
57.5-59.5 Hertz.

11. Connect the AC voltmeter test leads across ter-

minal lugs E1 and neutral; then across E2 and 
neutral. In both cases, voltage reading should be 
121-126 volts AC (7kW), and 125-126 volts AC 
(10, 13 and 16kW).

12. 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.

13. Set the generator's AUTO/OFF/MANUAL switch to 

OFF. The engine should shut down.

NOTE:

It is important not to proceed until certain 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* (*GH410 only). If 
frequency is correct, but voltage is high or low, the 
generator’s voltage regulator requires adjustment.

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.  Turn OFF all breakers on the load center of the 

transfer box (T1 and T2).

3.  Set the generator's AUTO/OFF/MANUAL switch to 

OFF.

4.  Turn OFF the utility power supply to the transfer 

switch, using the means provided (such as a util-
ity main line circuit breaker).



5.  Manually set the transfer switch to the STANDBY 

position, i.e., load terminals connected to the 
generator's E1/E2 terminals. The transfer switch 
operating lever should be down.

6.  Set the generator's AUTO/OFF/MANUAL switch 

to MANUAL. The engine should crank and start 
immediately.

7.  Let the engine stabilize and warm up for a few 

minutes.

8.  Set the generator’s main circuit breaker to its ON 

(or closed) position. Loads are now powered by 
the standby generator.

9.  Turn ON the load center of the transfer switch 

(T1 and T2).

10. Connect an accurate AC voltmeter and a frequen-

cy meter across terminal lugs E1 and E2.

• 7kW voltage should be greater than 230 volts and 

frequency should be greater than 58 Hz.