Hubbell LX-440 - Manual (Page 11)

Transfer Switch
Page 11 of 16 Pages
Auto Test
The following procedure is an example for testing the automatic transfer switch. A procedure should be
written by qualified personnel that is applicable to the facility, the transfer switch options, and the power
distribution system. Refer to job specifications for timing delays.
C AUTION: Always close enclosure door when switch transfers with power connected.
1. Press the TEST push button until the engine generator starts or automatic transfer switch transfers if
emergency source is a second utility.
2. Verify that the NORMAL indicator goes off and the EMERGENCY indicator comes on per the time
delay settings.
3. Verify that the automatic transfer switch transfers to the emergency source.
4. Verify that the automatic transfer switch retransfers to the normal position after 30 minutes
or press the optional BYPASS/RETRANSFER TO NORMAL push button.
5. If the emergency source is a generator set, verify that the engine runs unloaded for five minutes.
Troubleshooting
Hazardous voltage
will shock, burn,
or cause death.
Do not touch
until ALL power
is disconnected.
!
DANGER
W ARNING: Disconnect ALL power supply sources to the transfer switch before
servicing to prevent shock or accident hazard.
Before troubleshooting, perform the following checks:
a. visual inspection for physical damage.
b. ensure that all switches are in the normal operating position.
c. ensure that the engine generator is operational or the alternate source is available.
d. ensure that all wiring connections are secure.
See Table 6-1, page 12, for some examples of possible problems that could occur and steps to take for
repair.
Settings
Voltage and time delay settings are factory set per job specifications. DO NOT CHANGE VOLTAGE
SETTINGS WITHOUT CONSULTING HUBBELL ICD. The table below lists the typical time delay
settings.