Close To Generator Source Side; Return To Utility Source Side; Voltage Checks; Utility Voltage Checks - Generac Power Systems RTG24SHA1 Owner's Manual

Operation

Close to Generator Source Side

See Figure 4-1. Before proceeding, verify the position of
the switch by observing the position of the manual
operation handle. If the handle is DOWN, the contacts
are closed in the GENERATOR (STANDBY) position. No
further action is required. If the handle is UP, proceed
with Step 1.
1. With the handle inserted into the movable contact
carrier arm (A), move the handle DOWN. Be sure
to hold on to the handle as it will move quickly after
the center of travel.
2. Remove manual operating handle from movable
contact carrier arm. Return manual operating
handle to storage bracket (B).

Return to Utility Source Side

1. Manually actuate switch to return manual operating
handle to the UP position.
2. Remove manual operating handle from movable
contact carrier arm. Return manual operating
handle to storage bracket (B).

Voltage Checks

Utility Voltage Checks

1. Turn ON the UTILITY power supply to the transfer
switch using the utility service disconnect circuit
breaker.
DANGER
Electrocution. High voltage is present at
transfer switch and terminals. Contact with live
terminals will result in death or serious injury.
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.
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.

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.
14
Electrocution. High voltage is present at
transfer switch and terminals. Contact with live
terminals will result in death or serious injury.
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.
Frequency
Terminals E1 to E2
Terminals E1 to NEUTRAL
Terminals E2 to NEUTRAL
5. When certain that generator supply voltage is correct
and compatible with transfer switch ratings, turn OFF
the generator supply to the transfer switch.
6. On the generator panel, select the OFF mode 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
may require adjustment. If no-load frequency is
correct but voltage is not, the voltage regulator may
require adjustment.

Generator Tests Under Load

1. Set the generator main circuit breaker to OFF or
OPEN.
2. Set the utility service disconnect circuit breaker to
OFF or OPEN.
(000129)
3. Manually actuate the transfer switch main contacts
to the emergency (Standby) position. See "Manual
Operation".
4. To start the generator, select the MANUAL mode of
operation. When engine starts, let it stabilize for a
few minutes.
5. Set the generator main circuit breaker to ON or
CLOSED. The generator now powers all LOAD
circuits. Check generator operation under load as
follows:
(000123)
• 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.
DANGER
60-62 Hz
240-246 VAC
120-123 VAC
120-123 VAC
Automatic Transfer Switch Owner's Manual
(000129)