Transfer Switch
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.
CAUTION: 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,
! DANGERor cause death. Do not touch until ALL power is disconnected.
WARNING: 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
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.
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