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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. If it's not, verify that the MLCB is closed and verify AC output between the E1 and E2 of the MLCB and Neutral at the
generator. Also, verify wiring from generator to E1, E2 ans Neutral lugs at transfer switch.
12. Set the generator's main circuit breaker to its OFF (or OPEN) position.
13. Push the generator's OFF button. 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.
7.6 GENERATOR TESTS UNDER LOAD
To test the generator set with electrical loads applied, proceed as follows:
1. Ensure that the generator is OFF.
2. Turn OFF all breakers/electrical loads that will be powered by the generator.
3. 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 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.
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. Push the generator's MANUAL button. 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 the circuit breaker/electrical loads that are powered by the generator one by one.
9. Connect a calibrated AC voltmeter and a frequency meter across terminal lugs E1 and E2. Voltage should be approximately 240 volts and
frequency should be 60 Hz. If the voltage and frequency are rapidly dropping as the loads are applied, the generator may be overloading or
there may be a fuel issue. Check amperage value of loads and/or fuel pressure.
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. Verify gas pressure while under full load.
12. When testing under load is complete, turn OFF electrical loads.
13. Set the generator's main circuit breaker to the OFF (or OPEN) position.
14. Let the engine run at no-load for 2-5 minutes.
15. Push the generator's OFF button. The engine should shut down.
7.7 CHECKING AUTOMATIC OPERATION
To check the system for proper automatic operation, proceed as follows:
1. Ensure that the generator is OFF.
2. Install front cover of the transfer switch.
3. Turn ON the utility power supply to the transfer switch, using the means provided (such as a utility main line circuit breaker).
NOTE: Transfer Switch will transfer back to utility position.
4. Set the generator's main circuit breaker to its ON (or CLOSED) position.
5. Push the generator's AUTO button. The system is now ready for automatic operation.
6. Turn OFF the utility power supply to the transfer switch.
With the generator ready for automatic operation, the engine should crank and start when the utility source power is turned OFF after a 10 second
delay (factory default setting). After starting, the transfer switch should connect load circuits to the standby side after a fi ve (5) second delay. Let the
system operate 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 approximately 15 seconds, the switch should transfer loads back to the utility power source.
• Approximately one minute after re-transfer, the engine should shut down.
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