9
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
3.3.1 UTILITY 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.
Measure across ATS terminal lugs N1 and N2; N1 to NEUTRAL
and N2 to NEUTRAL.
FAILURE TO TURN OFF THE UTILITY SUP-
PLY BEFORE WORKING ON THE UTILITY
CONNECTIONS OF THE ATS WILL RESULT
IN EXTREMELY DANGEROUS AND POSSIBLY
FATAL ELECTRICAL SHOCK.
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.
3.3.2 GENERATOR VOLTAGE CHECKS
1. On the generator panel, select the MANUAL mode of operation.
The generator should crank and start.
2. Let the generator stabilize and warm up at no-load for at least
five minutes.
3. 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.
4. With an accurate AC voltmeter and frequency meter, check the
no-load, voltage and frequency.
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
Failure to do so may result in damage to cer-
tain rotary equipment.
5. When certain that UTILITY supply voltage is correct and compat-
ible 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. On the generator panel, select the OFF mode to shut down the
generator.
NOTE:
Do NOT proceed until generator AC output voltage and frequen-
cy 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.
Operation
