Generator Tests Under Load; Checking Automatic Operation - Generac 8kW Manual Del Usario

Post Installation Start-up and Adjustments
6. Check utility power source voltage across terminals 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 compatible 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 inter-
nal temperatures to stabilize. Then, set the generator's main
circuit breaker to its ON (or closed) position.
 Proceed with caution! Generator power volt-
age is now supplied to the transfer switch.
Contact with live transfer switch parts will
result in dangerous and possibly fatal electri-
cal shock.
10. Connect an accurate AC voltmeter and a frequency meter
across transfer switch terminal lugs E1 and E2. Voltage
should be 238-242 at a frequency of 59.5-60.5 Hertz.
11. Connect the AC voltmeter test leads across terminal lugs E1
and neutral; then across E2 and neutral. In both cases, voltage
reading should be 119-121 volts AC.
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.
It is important not to proceed until certain that generator AC
voltage and frequency are correct and within the stated limits.
2.5 GENERATOR 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) posi-
tion.
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 utility main line circuit
breaker).

Do not attempt manual transfer switch opera-
tion until all power voltage supplies to the
transfer switch have been positively turned
off. Failure to turn off all power voltage sup-
plies will result in extremely hazardous and
possibly fatal electrical shock.
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.
16
NOTE:
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 frequency meter
across terminal lugs E1 and E2.
– Voltage should be greater than, or approximately 240 volts
and frequency should be 60 Hz.
11. 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 overheat-
ing, etc.
12. When testing under load is complete, turn OFF electrical
loads.
13. Set the generator's main circuit breaker to its OFF (or OPEN)
position.
14. Let the engine run at no-load for a few minutes.
15. Set the AUTO/OFF/MANUAL switch to OFF. The engine should
shut down.
2.6 CHECKING AUTOMATIC
OPERATION
To check the system for proper automatic operation, proceed as
follows:
1. Set generator's main circuit breaker to its OFF (or OPEN) posi-
tion.
2. Check that the AUTO/OFF/MANUAL switch is set to OFF.
3. Turn OFF the utility power supply to the transfer switch, using
means provided (such as a utility main line circuit breaker).
4. Manually set the transfer switch to the UTILITY position, i.e.,
load terminals connected to the utility power source side.
5. Turn ON the utility power supply to the transfer switch,
using the means provided (such as a utility main line circuit
breaker).
6. Set the generator's main circuit breaker to its ON (or CLOSED)
position.
7. Set the AUTO/OFF/MANUAL switch to AUTO. The system is
now ready for automatic operation.
8. Turn OFF the utility power supply to the transfer switch.
With the AUTO/OFF/MANUAL switch at AUTO, the engine should
crank and start when the utility source power is turned OFF after a
10 second delay. After starting, the transfer switch should connect
load circuits to the standby side after a five (5) second delay. Let
the system go through its entire automatic sequence of operation.
With the generator running and loads powered by generator AC
output, turn ON the utility power supply to the transfer switch. The
following should occur:
• After about 15 seconds, the switch should transfer loads back
to the utility power source.
• About one minute after re-transfer, the engine should shut
down.