Operation
16
Automatic Transfer Switch Owner’s Manual
3.
See
. Note position of transfer mecha-
nism main contacts (C, D) by observing display
windows in “A” and “B” as follows:
• Window “A” ON, Window “B” OFF—LOAD termi-
nals (T1, T2) are connected to utility terminals
(N1, N2).
• Window “A” OFF, Window “B” ON—LOAD termi-
nals (T1, T2) are connected to emergency termi-
nals (E1, E2).
Close to Normal Source Side
See
. Before proceeding, verify the position of
the switch by observing Window “A.” If Window “A” reads
“ON”, the contacts are closed in the normal position; no
further action is required. If it reads “OFF”, proceed as
follows:
•
Attach handle (A) to actuating shaft (B). 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”.
Close to Standby Source Side
See
. Before proceeding, verify the position of
the switch by observing Window “B.” If Window “B” reads
“ON”, the contacts are closed in the EMERGENCY
(STANDBY) position; no further action is required. If it
reads “OFF”, proceed as follows:
•
Attach handle (A) to actuating shaft (B). 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”.
Return to Normal Source Side
Manually actuate switch to return Window “A” to the “ON”
position.
Voltage Checks
NOTE:
Use the Digital Multimeter (DMM) LowZ low input
impedance setting to collect accurate voltage measure-
ments. LowZ eliminates the possibility of inaccurate
ghost voltage readings, also known as phantom voltage
or stray voltage readings. Refer to the DMM manufac-
turer’s literature for additional information.
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).
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.
Generator Voltage Checks
1.
On the generator panel, select MANUAL mode.
The generator will crank and start.
2.
Allow generator to stabilize and warm up at no-load
for at least five minutes.
3.
Set generator main circuit breaker (CB1) to ON
(CLOSED).
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.
5.
When certain that generator supply voltage is
correct and compatible with transfer switch ratings,
turn OFF generator supply to the transfer switch.
6.
Set generator main circuit breaker (CB1) to OFF
(OPEN).
7.
On the generator panel, select OFF to shut down
the generator.
NOTE:
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 may require adjust-
ment. If no-load frequency is correct but voltage is not,
the voltage regulator may require adjustment.
(000129)
DANGER
Electrocution. High voltage is present at
transfer switch and terminals. Contact with live
terminals will result in death or serious injury.
(000123)
DANGER
Electrocution. Turn utility supply OFF before
working on utility connections of the transfer
switch. Failure to do so will result in death or
serious injury.
Frequency
60–62 Hz
Terminals E1 to E2
240–246 VAC
Terminals E1 to NEUTRAL
120–123 VAC
Terminals E2 to NEUTRAL
120–123 VAC
(000129)
DANGER
Electrocution. High voltage is present at
transfer switch and terminals. Contact with live
terminals will result in death or serious injury.
