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6 Generac
®
Power Systems, Inc.
• Window “A” OFF, Window “B” ON - LOAD
terminals (T1, T2) are connected to
EMERGENCY terminals (E1, E2).
Do not use excessive force when operating
the transfer switch manually or the manual
handle could be damaged.
3.2.1 CLOSE TO NORMAL SOURCE SIDE
Before proceeding, verify the position of the switch by
observing window “A” in Figure 3.1. If window “A”
reads “ON”, the contacts are closed in the NORMAL
position, no further action is required. If it reads
“OFF”, proceed with Step 1.
Step 1: With the handle attached to the actuating
shaft, move handle in the direction of the
arrow on the switch cover until it stops — DO
NOT FORCE. Release handle slowly to allow
the spring in the switch box to relax. “ON”
now appears in Window “A” and “OFF”
appears in Window “B”.
3.2.2 CLOSE TO EMERGENCY SOURCE SIDE
Before proceeding, verify the position of the switch by
observing window “B” in Figure 3.1. If window “B”
reads “ON”, the contacts are closed in the
EMERGENCY (STANDBY) position. No further action
is required. If it reads “OFF”, proceed with Step 1.
Step 1: With the handle attached to the actuating
shaft, move the handle in the direction of the
arrow on the switch cover until it stops - DO
NOT FORCE. Release handle slowly to allow
the spring in the switch box to relax. “OFF”
now appears in Window “A” and “ON” appears
in Window “B”.
3.2.3 RETURN TO NORMAL SOURCE SIDE
Manually actuate switch to return Window “A” to the
“ON” position.
3.3 VOLTAGE CHECKS
1. Turn ON the UTILITY power supply to the
transfer switch with whatever means provided
(such as the UTILITY maim line 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.
Single-phase utility supply:
Measure across ATS terminal lugs N1 and N2; 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.
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.
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.
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
It will also be necessary to verify that the phase
rotation 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.
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 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.
!
DANGER
DANGER
◆
◆
◆
!
Section 3 — Operation
Generac GTS “W” Type Transfer Switch