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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.
4. With an accurate AC voltmeter and frequency
meter, check the no-load, voltage and frequency.
Single-phase generator supply:
Measure across ATS terminal lugs E1 to E2; E1
to NEUTRAL and E2 to NEUTRAL.
a. Frequency ....................................... 60-62 Hz
b. Terminals E1 to E2 ........................ 240-246 VAC
c. Terminals E1 to NEUTRAL ............. 120-123 VAC
d. Terminals E2 to NEUTRAL ............. 120-123 VAC
Three-phase generator supply:
Measure across ATS terminal lugs E1 to E2, E2
to E3 and E1 to E3.
Measure across ATS terminal lugs E1 to NEUTRAL,
E2 to NEUTRAL and E3 to NEUTRAL.
a. Frequency ....................................... 60-62 Hz
b. Terminals E1-E2, E2-E3, E1-E3 ..... 208-212VAC or
c. Terminals E1-N, E2-N, E3-N ........... 120-122VAC or
It will also be necessary to verify that the phase rota-
tion of the utility matches the phase rotation of the
generator. This can be done by using a phase rotation
indicator.
Failure to do so may result in damage to certain
rotary equipment.
5. When certain that UTILITY supply voltage is cor-
rect and compatible with transfer switch ratings,
turn OFF the UTILITY supply to the transfer
switch.
6. Set the generator's main circuit breaker (CB1) to
its OFF or OPEN position.
7. Set the Auto/Off/Manual switch to the OFF position
to shut down the generator.
Do NOT proceed until generator AC output volt-
age and frequency are correct and within stated
limits. If the no-load voltage is correct but no-
load frequency is incorrect, the engine governed
speed probably requires adjustment. If no-load
frequency is correct but voltage is not, the voltage
regulator may require adjustment.
470-485
272-282
NOTE:
Section 3 — Operation
RTS "HS" Type Transfer Switch
3.4
GENERATOR TESTS UNDER LOAD
1. Set the generator's main circuit breaker to its
OFF or OPEN position.
2. Manually actuate the transfer switch main con-
tacts to their emergency (Standby) position. Refer
to "Manual Operation".
3. To start the generator, set the AUTO/OFF/MANUAL
switch to MANUAL. When engine starts, let it sta-
bilize for a few minutes.
4. Turn the generator's main circuit breaker to the
ON or CLOSED position. The generator now pow-
ers all LOAD circuits. Check generator operation
under load as follows:
•
Turn ON electrical loads to the full rated watt-
age/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 200 volts (208VAC system), 230
volts (240VAC system) or 460 volts (480VAC
system; frequency should be greater than 59
Hz.
•
Let the generator run under rated load for at
least 30 minutes. With unit running, listen for
unusual noises, vibration, overheating, etc.,
that might indicate a problem.
5. When checkout under load is complete, set main
circuit breaker of the generator to the OFF or
OPEN position.
6. Let the generator run at no-load for several min-
utes. Then, shut down by setting the AUTO/OFF/
MANUAL switch to its OFF position.
7. Move the switch's main contacts back to the
UTILITY position. For example, load connected to
utility power supply. Refer to "Manual Operation".
Handle and operating lever of transfer switch
should be in down position.
8. Turn on the utility power supply to transfer
switch, using whatever means provided (such
as a utility main line circuit breaker). The utility
power source now powers the loads.
9. Set the generator's AUTO/OFF/MANUAL switch to
its AUTO position. The system is now set for fully
automatic operation.
7
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