Generac Power Systems RG02224 Owner's Manual page 19

Checking Manual Transfer Switch Operation
DANGER
Electrocution. Do not manually transfer under
load. Disconnect transfer switch from all
power sources prior to manual transfer. Fail-
ure to do so will result in death or serious in-
jury, and equipment damage.
See transfer switch manufacturer's instructions.
Electrical Checks
DANGER
Electrocution. High voltage is present at
transfer switch and terminals. Contact with
live terminals will result in death or serious
injury.
Proceed as follows to complete electrical checks:
1. Verify generator is OFF. A red LED on the control
panel will illuminate to confirm system is in OFF
mode.
2. Verify generator MLCB (generator disconnect) is
set to OFF (OPEN).
3. Turn OFF all circuit breakers / electrical loads to be
powered by generator.
4. Turn on utility power supply to transfer switch using
means provided (such as a utility MLCB).
5. Use an accurate AC voltmeter to check utility power
source voltage across transfer switch terminals N1,
N2, and N3 (if 3-phase). Normal line-to-line voltage
should be equivalent to rated unit voltage.
6. Check utility power source voltage across terminals
N1, N2, and N3 (if 3-phase) and transfer switch
neutral lug.
7. When utility supply voltage is compatible with trans-
fer switch and load circuit ratings, turn OFF utility
power supply to transfer switch.
8. Press MANUAL on control panel to crank and start
engine.
9. Allow engine to warm up for about five minutes. Set
generator MLCB (generator disconnect) to ON
(CLOSED).
10. Connect an accurate AC frequency meter across
transfer switch terminal lugs E1, E2, and E3 (if 3-
phase) and verify correct rated frequency (50 Hz or
60 Hz).
11. Use an accurate AC voltmeter to check generator
output voltage across transfer switch terminals E1
to E2, (E2 to E3 and E3 to E1 if 3-phase). Normal
line-to-line voltage should be equivalent to site spe-
cific utility voltage.
Spark-Ignited Stationary Generators Owner's Manual
12. Successively connect the AC voltmeter test leads
across terminal lugs E1 and Neutral, then E2 and
Neutral (and E3 and Neutral if 3-phase). Line-to-
neutral reading in each case should match utility
voltage reading. If system is 3-phase, verify gener-
ator phase rotation matches utility phase rotation.
13. Set generator MLCB (generator disconnect) to
OFF (OPEN).
(D000132)
14. Press OFF on control panel to shut engine down.
IMPORTANT NOTE: Do not proceed unless certain
generator AC voltage and frequency are correct and
within stated limits.
Testing Generator Under Load
(D000129)
Proceed as follows to test generator set with electrical
loads applied:
1. Verify generator is OFF. A red LED on the control
panel will illuminate to confirm system is in OFF
mode.
2. Turn OFF all breakers / electrical loads to be sup-
plied by generator.
3. Turn OFF utility power supply to transfer switch, us-
ing means provided (such as a utility MLCB).
4. Manually set transfer switch to STANDBY position,
i. e., load terminals connected to generator's E1,
E2, and E3 (if 3-phase) terminals.
5. Press MANUAL on control panel. Engine will crank
and start.
6. Allow engine to warm up for a few minutes.
7. Set generator MLCB (generator disconnect) to ON
(CLOSED). The transfer switch is now powered by
standby generator.
8. Turn ON circuit breaker / electrical loads powered
by generator.
9. Connect a calibrated AC voltmeter and a frequency
meter across terminal lugs E1, E2, and E3 (if 3-
phase). Voltage should be approximately unit rated
voltage. Test with clamp on amp meter to ensure
unit is not overloaded.
10. Let generator run at full rated load for 20 – 30 mi-
nutes. Listen for unusual noises, vibration, or other
indications of abnormal operation. Inspect for oil
leaks, evidence of overheating, or other problem
conditions.
Activation and Startup
DANGER
Electrocution. Do not manually transfer under
load. Disconnect transfer switch from all
power sources prior to manual transfer. Fail-
ure to do so will result in death or serious in-
jury, and equipment damage.
(D000132)
19