Section 3 — Post Installation Start-Up Adjustments
Generac 100 Amp Transfer Switch
3.3TRANSFER SWITCH VOLTAGE
CHECKS
1.Turn ON the UTILITY power supply to the transfer switch with whatever means provided (such as the UTILITY main line circuit breaker).
DANGER
Proceed with caution. The transfer switch is now electrically hot. Contact with live terminals results in extremely hazardous and possibly fatal electrical shock.
2.With an accurate AC voltmeter, check for correct voltage across terminal lugs N1 and N2; N1 to NEU- TRAL; and, finally, N2 to NEUTRAL (see Wiring Diagram on Page 8).
3.When certain that UTILITY supply voltage is correct and compatible with transfer switch ratings, turn OFF the UTILITY supply to the transfer switch.
4.On the generator panel, set the
5.Let the generator stabilize and warm up at
6.Set the generator’s main circuit breaker (CB1) to its ON or CLOSED position.
DANGER
Proceed with caution. Generator output voltage is now being delivered to transfer switch termi- nals. Contact with live terminals results in extremely dangerous and possibly fatal electrical shock.
7.With an accurate AC voltmeter and frequency meter, check the
a.
b.Terminals E1 and
c.Terminal E1 to
d.Terminal E2 to
8.Set the generator’s main circuit breaker (CB1) to its OFF or OPEN position.
9.To shut down the generator, set its
NOTE:
3.4GENERATOR TESTS UNDER LOAD
1.Set the generator’s main circuit breaker to its OFF or OPEN position.
2.Turn OFF utility power to the transfer switch.
3.Manually move the transfer switch main contacts to their STANDBY position.
4.To start the generator, set the
5.Turn the generator’s main circuit breaker to its ON or CLOSED position. The generator now powers all LOAD circuits. Check generator operation under load as follows:
•Turn ON electrical loads to the full rated wattage/amperage capacity of the generator. DO NOT OVERLOAD.
•With maximum rated load applied, check voltage and frequency across transfer switch terminals E1 and E2. Voltage should be greater than 230 volts; frequency should be greater than 58 Hz.
•Let the generator run under rated load for at least 30 minutes. With the unit running, listen for unusual noises, vibration, overheating, etc., that might indicate a problem.
6.When checkout under load is complete, set the gen- erator’s main circuit breaker to its OFF or OPEN position.
7.Let the generator run at
8.With the manual transfer handle, move the switch’s main contacts back to their utility position, i.e., load connected to utility power supply. The handle and operating lever of the transfer switch should be in the up position.
9.Turn on the utility power supply to the transfer switch, using whatever means provided (such as a utility main line circuit breaker). The utility power source now powers the loads.
10.Set the generator’s main circuit breaker to its ON or CLOSED position.
11.Set the generator’s
Do NOT proceed until generator AC output voltage and frequency are correct and within stated lim- its. If the
6 Generac® Power Systems, Inc.