Product Manual

7
VOLTAGE CHECKS
1. Turn ON the UTILITY power supply to the transfer switch
using the UTILITY service disconnect and 125A, 2-pole circuit
breaker for lower panel feed circuit breaker.

 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.
Measure across the terminals of the UTILITY voltage sensing
circuit breaker. Also check UTILITY voltage sensing terminals
to NEUTRAL.
3. When certain that UTILITY supply voltage is correct and compat-
ible with transfer switch ratings, turn OFF the UTILITY supply to
the transfer switch.
4. On the generator panel, set the AUTO/OFF/MANUAL switch to
MANUAL position. The generator should crank and start.
5. Let the generator stabilize and warm up at no-load for at least
five minutes.
6. Turn the GENERATOR DISCONNECT SWITCH to the ON posi-
tion.
7. Set the generator's main circuit breaker (CB1) to its ON or
CLOSED position.

 PROCEED WITH CAUTION. GENERATOR
OUTPUT VOLTAGE IS NOW BEING DELIVERED
TO TRANSFER SWITCH TERMINALS.
CONTACT WITH LIVE TERMINALS RESULTS
IN EXTREMELY DANGEROUS AND POSSIBLY
FATAL ELECTRICAL SHOCK.
8. With an accurate AC voltmeter and frequency meter, check the
no-load, voltage and frequency.
Measure across GENERATOR SUPPLY SWITCH terminals.
Also check each switch terminal to NEUTRAL.
a. Frequency ..............................................................60-62 Hertz
b. Generator Supply Switch Terminals ..................... 240-246 VAC
c. Generator Supply Switch Terminals to Neutral ..... 120-123 VAC
9. Set the generator’s main circuit breaker (CB1) to its OFF or
OPEN position.
10. Set the AUTO/OFF/MANUAL switch to the OFF position to shut
down the generator.
NOTE:
Do NOT proceed until generator AC output voltage and fre-
quency are correct and within stated limits. If the no-load volt-
age is correct but no-load frequency is incorrect, the engine
governed speed may require adjustment. If no-load frequency
is correct but voltage is not, the voltage regulator may require
adjustment.
GENERATOR TESTS UNDER LOAD
n
The load center dead front must be installed
before proceeding with Generator Tests Under
Load. This is necessary for proper operation of
the mechancal interlock.
1. Set the generator's main circuit breaker to its OFF or OPEN
position.
2. Set the 125A LOWER PANEL FEED circuit breaker to the OFF
position.
3. Manually actuate the transfer mechanism main contacts to
their GENERATOR (STANDBY) position. Refer to the Manual
Operation section.
4. To start the generator, set the AUTO/OFF/ MANUAL switch to
MANUAL. When engine starts, let it stabilize for a few min-
utes.
5. Turn the GENERATOR SUPPLY SWITCH to the ON position.
6. 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/amper-
age capacity of the generator. DO NOT OVERLOAD.
• With maximum rated load applied, check voltage and
frequency at a 120 VAC outlet. Voltage should be greater
than 115 VAC and frequency should be greater than 59
Hertz.
• Let the generator run under rated load for at least 30 min-
utes. With unit running, listen for unusual noises, vibra-
tion, overheating, etc., that might indicate a problem.
7. When checkout under load is complete, set main circuit
breaker of the generator to its OFF or OPEN position.
8. Let the generator run at no-load for several minutes. Then,
shut down by setting the AUTO/OFF/MANUAL switch to its
OFF position.
9. Turn the GENERATOR DISCONNECT circuit breaker to the ON
position.
10. Move the transfer mechanism main contacts back to their
UTILITY position. Refer to the Manual Operation section.
11. Turn on the utility power supply to transfer mechanism, using
the 125A LOWER PANEL FEED circuit breaker. The utility
power source now powers the loads.
12. Set the generator's AUTO/OFF/MANUAL switch to its AUTO
position. The system is now set for fully automatic opera-
tion.
Operation