Guardian Technologies 04759-2 Manual De Usuario

3.  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.

4.  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.

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

OFF (or open) position. Initial tests will be con-
ducted at no-load condition.

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.



8.  Connect an accurate AC voltmeter and a fre-

quency meter across transfer switch terminal 
lugs E1 and E2. Voltage should be 242-252 volts; 
frequency should read about 61-63 Hertz.

9.  Connect the AC voltmeter test leads across ter-

minal lug E1 and neutral; then across E2 and 
neutral. 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 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. If frequency is cor-
rect, 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. 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).



4.  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.

5.  Set the generator's AUTO/OFF/MANUAL 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 generator.

8.  Turn ON electrical loads. Apply an electrical load 

equal to the full rated wattage/amperage capacity 
of the installed generator.

9.  Connect an accurate AC voltmeter and a frequen-

cy meter across terminal lugs E1 and E2. Voltage 
should be greater than 230 volts; frequency 
should be greater than 58 Hertz.

10. Let the generator run at full rated load for 20-30 

minutes. Listen for unusual noises, vibration or 
other indications of abnormal operation. Check 
for oil leaks, evidence of overheating, etc.

11. When testing under load is complete, turn OFF 

electrical loads.

12. Set the generator's main circuit breakers to their 

OFF (or open) positions.

13. Let the engine run at no-load for a few minutes.
14. Set the AUTO/OFF/MANUAL switch to OFF. The 

engine should shut down.

To check the system for proper automatic operation, 
proceed as follows:

1.  Set the generator’s main circuit breaker to it’s 

OFF (or open) position.

2.  Check that the AUTO/OFF/MANUAL switch is set 

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).

  

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