Generator Tests Under Load - Generac 20 kW Synergy Guia De Instalacion

Check utility power source voltage across terminals N1 and the transfer switch neutral lug; then across terminal
6.
N2 and neutral. Nominal line-to-neutral voltage should be 120 volts AC. If it's not, verify AC output and wiring
from utility source to N1 and N2 lugs at transfer switch.
When certain that utility supply voltage is compatible with transfer switch and load circuit ratings, turn OFF the
7.
utility power supply to the transfer switch to simulate a power outage.
NOTE: Do not remove the N1 and N2 fuses in order to simulate an outage.
Press MANUAL on the control pad. The engine cranks and starts.
8.
Once the generator is running, IMMEDIATELY move the GENERATOR DISCONNECT Circuit Breaker switch to
9.
the ON (Closed) position. This prevents the speed from ramping down before the load is applied, a condition
which could cause the engine to stall.
*
Proceed with caution! Generator power voltage is now supplied to the transfer switch. Con-
tact with live transfer switch parts will result in dangerous and possibly fatal electrical shock.
Connect an accurate AC voltmeter and a frequency meter across transfer switch terminal lugs E1 and E2. Volt-
10.
age should be 220-242 VAC (depending on load) at a frequency of 59.5-60.5 Hertz. If it's not, verify that the
MLCB is closed and verify AC output and frequency (Hertz or Hz) at the MLCB. Also verify wiring from generator
to E1 and E2 lugs at transfer switch.
Connect the AC voltmeter test leads across terminal lugs E1 and neutral; then across E2 and neutral. In both
11.
cases, voltage reading should be 110-121 VAC. 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.
Move the Generator Disconnect Circuit Breaker switch to the OFF (Open) position.
12.
Press OFF on the control pad to shut down the engine.
13.
NOTE: At this point, the loadshed control sees no frequency (utility and generator are disconnected) and oper-
ates all loadshed relays. Once utility is restored, there is a delay before all loads are reconnected.
NOTE: It is important not to proceed until certain that generator AC voltage and frequency are correct and
within the stated limits.
If utility is present, the secondary 12V DC fan continues to operate for up to one hour after
the generator is shut down (even if the 7.5 amp ATO fuse is removed). To avoid hand injury,
always exercise caution when working near the AVR fan housing.
7.12 — Generator Tests Under Load
To test the generator set with electrical loads applied, proceed as follows:
Verify that the generator is OFF. A red LED illuminates to confirm that system is in OFF mode.
1.
Turn off all circuit breakers/electrical loads that are to be powered by the generator.
2.
Turn OFF the utility power supply to the transfer switch using the means provided (such as a utility main line cir-
3.
cuit breaker).
*
Do not attempt manual transfer switch operation until all power voltage supplies to the trans-
fer switch have been positively turned off. Failure to turn off all power voltage supplies will
result in extremely hazardous and possibly fatal electrical shock.
Manually set the transfer switch to the STANDBY position, i.e., load terminals connected to the generator's E1/
4.
E2 terminals. The transfer switch operating lever should be down.
Move the Generator Disconnect Circuit Breaker switch to the OFF (or open) position.
5.
Press MANUAL on the control pad. The engine cranks and starts.
6.
Installation Guidelines for Air-Cooled Generators
Operation
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