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Operation
4.2.2— Close to Generator Source Side
Before proceeding, verify the position of the switch by
observing the position of the manual operation handle in
. If the handle is DOWN, the contacts are closed
Figure 4-1
in the GENERATOR (STANDBY) position. No further
action is required. If the handle is UP, proceed with Step
1.
With the handle inserted into the movable contact
1.
carrier arm, move the handle DOWN. Be sure to
hold on to the handle as it will move quickly after
the center of travel.
Remove manual operating handle from movable
2.
contact carrier arm. Return handle to storage
bracket.
4.2.3— Return to Utility Source Side
Manually actuate switch to return manual operating
1.
handle to the UP position.
Remove manual operating handle from movable
2.
contact carrier arm. Return handle to storage
bracket.
4.3 — Voltage Checks
4.3.1— Utility Voltage Checks
Turn ON the UTILITY power supply to the transfer
1.
switch using the breaker in main distribution panel.
With an accurate AC voltmeter, check for correct
2.
voltage. Measure across ATS terminal lugs N1 and
N2; N1 to NEUTRAL and N2 to NEUTRAL.
4.3.2— Generator Voltage Checks
On the generator panel, select the MANUAL mode
1.
of operation. The generator should crank and start.
Let the generator stabilize and warm up at no-load
2.
for at least five minutes.
10
Set the generator's main circuit breaker (CB1) to its
3.
ON or CLOSED position.
With an accurate AC voltmeter and frequency
4.
meter, check the no-load, voltage and frequency.
Measure across ATS terminal lugs E1 to E2; E1 to
NEUTRAL and E2 to NEUTRAL.
Frequency
Terminals E1 to E2
Terminals E1 to NEUTRAL
Terminals E2 to NEUTRAL
When certain that generator supply voltage is cor-
5.
rect and compatible with transfer switch ratings,
turn OFF the generator supply to the transfer
switch.
Set the generator main circuit breaker (CB1) to
6.
OFF or OPEN.
On the generator panel, select the OFF mode to
7.
shut down the generator.
NOTE: Do NOT proceed until generator AC output
voltage and frequency are correct and within stated
limits.
4.4 — Generator Tests Under Load
Set the generator main circuit breaker to OFF or
1.
OPEN.
Set the utility service disconnect circuit breaker to
2.
OFF or OPEN.
Manually actuate the transfer switch main contacts
3.
to the Standby position. See
To start the generator, select the MANUAL mode of
4.
operation. When engine starts, let it stabilize for a
few minutes.
Set the generator main circuit breaker to ON or
5.
CLOSED. The generator now powers all LOAD cir-
cuits. Check generator operation under load as fol-
lows:
•
Turn on electrical loads to the full rated wattage/
amperage capacity of the generator. DO NOT
OVERLOAD.
•
With maximum rated load applied, check voltage
and frequency across transfer switch terminals E1
and E2. Voltage should be greater than 230 VAC
(240 VAC system); frequency should be greater
than 59 Hz.
Automatic Transfer Switch Owner's Manual
60-62 Hz
240-246 VAC
120-123 VAC
120-123 VAC
.
Manual Operation
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