6
5. Let the generator stabilize and warm up at no-load for at least
five minutes.
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 TERMINALS.
CONTACT WITH LIVE TERMINALS RESULTS
IN EXTREMELY DANGEROUS AND POSSIBLY
FATAL ELECTRICAL SHOCK.
7. With an accurate AC voltmeter and frequency meter, check the
no-load, voltage and frequency.
Measure across ATS terminal lugs E1 to E2. Also check E1 to
NEUTRAL and E2 to NEUTRAL.
a. Frequency ....................................................60-62 Hertz
b. Terminals E1 to E2 .......................................240-246 VAC
c. Terminals E1 to NEUTRAL ............................120-123 VAC
d. Terminals E2 to NEUTRAL ............................120-123 VAC
8. Set the generator’s main circuit breaker (CB1) to its OFF or
OPEN position.
9. 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.
3.4 GENERATOR TESTS UNDER
LOAD
1. Set the generator's main circuit breaker to its OFF or OPEN
position.
2. Set the UTILITY SERVICE DISCONNECT circuit breaker to the
OFF position.
3. Manually actuate the transfer switch main contacts to
their GENERATOR (STANDBY) position. Refer to "Manual
Operation".
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'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 across transfer switch terminals E1 and E2.
Voltage should be greater than 230VAC 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.
6. When checkout under load is complete, turn the generator's
main circuit breaker to its OFF or OPEN position.
7. Let the generator run at no-load for several minutes. Then,
shut down by setting the AUTO/OFF/MANUAL switch to its
OFF position.
8. Move the transfer switch's main contacts back to their UTIL-
ITY position. For example, LOAD connected to UTILITY power
supply. Refer to "Manual Operation". Handle and operating
lever of transfer switch should be in the UP position.
9. Turn on the utility power supply to transfer switch, using the
UTILITY SERVICE DISCONNECT circuit breaker. The utility
power source now powers the loads.
10. Set the generator's AUTO/OFF/MANUAL switch to its AUTO
position.
Section 3 — Operation
RTS “HS” Type Transfer Switch
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