Voltage Checks - Generac Power Systems RTS Technical Manual

Attach handle to actuating shaft.
3.3

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.
Single-phase utility supply:
Measure across ATS terminal lugs N1 and N2. Also check N1
to NEUTRAL and N2 to NEUTRAL.
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 AUTO/OFF/MANUAL switch to
MANUAL position. The generator should crank and start.
Figure 3.1 — Actuating Transfer Switch
Move handle
UP for the
NORMAL
(UTILITY)
position.
5.
6.

7.
Section 3 — Operation
RTS "HS" Type Transfer Switch
NOTE: Return handle to
storage position in enclosure
when finished with manual transfer.
Let the generator stabilize and warm up at no-load for at least
five minutes.
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.
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. 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
Move handle
DOWN for the
EMERGENCY
(STANDBY)
position.
5