Close To Generator Source Side; Return To Utility Source Side; Voltage Checks; Utility Voltage Checks - Generac Power Systems RXUW200A3 Owner's Manual

Operation (RXUW Models Only)

Close to Generator Source Side

Before proceeding, verify the position of the switch by
observing the position of the manual operation handle in
Figure 4-1. 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, 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 handle to storage
bracket.

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 handle to storage
bracket.

Voltage Checks

NOTE: Use the Digital Multimeter (DMM) LowZ low input
impedance setting to
measurements. LowZ eliminates the possibility of
inaccurate ghost voltage readings, also known as
phantom voltage or stray voltage readings. See DMM
manufacturer's literature for additional information.

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.
18
collect accurate voltage
(000129)
(000123)

Generator Voltage Checks

1. On the generator panel, select MANUAL. 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
ON or CLOSED.
DANGER
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 the generator supply voltage is correct
and compatible with transfer switch ratings, turn
OFF the generator supply to the transfer switch.
6. Set the generator main circuit breaker (CB1) to
OFF or OPEN.
7. On the generator panel, select OFF 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 of
the transfer switch to OFF or OPEN, and turn OFF
or OPEN all load circuit breakers.
3. Manually actuate the transfer switch main contacts
to the emergency (standby) position. See
Operation.
4. To start the generator, select MANUAL. When
engine starts, let it stabilize for a few minutes, and
close lid (if applicable).
Automatic Transfer Switch Owner's Manual
(000129)
60–62 Hz
240–246 VAC
120–123 VAC
120–123 VAC
Manual