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Operation
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 main 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 to N2, N2 to N3, and
N1 to N3.
Measure across ATS terminal lugs N1 to NEUTRAL, N2 to
NEUTRAL, and N3 to NEUTRAL.
3.
Locate the 3 phase power monitor relay. Verify the following:
208 Vac system - LED green and ON
480 Vac system - LED - NORM indicator (green - ON)
The factory setting is 80% of nominal voltage (208 Vac sys-
tems = 166 Vac dropout)
(480 Vac systems = 384 Vac dropout)
4.
If the LED indicator is not ON, then it will be necessary to
adjust the power monitor relay setting. Rotate the adjustment
potentiometer in a counter-clockwise direction until the LED
turns ON. At this point the 3 phase power monitor relay is the
most sensitive to irregular power line conditions.
If the power monitor does not operate properly, check that all
three voltages are present, and are of the correct voltage level
and phase rotation. To change phase rotation, turn off the utility
supply, interchange 2 of the utility power phases.
6
NOTE:
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.
5.
When certain that UTILITY supply voltage is correct and
compatible with transfer switch ratings, turn OFF the UTILITY
supply to the transfer switch.
3.3.2 GENERATOR VOLTAGE CHECKS
1.
On the generator panel, set the AUTO/OFF/ MANUAL switch to
MANUAL position. 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, 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 rotation of the util-
ity 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 cer-
tain rotary equipment.
5.
When certain that UTILITY supply voltage is correct 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.
470-485
272-282
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