Utilizing a voltmetre, measure phase-to-phase and
phase-to-neutral voltages across the Emergency
Bypass Line Terminal to insure Emergency voltage is
correct. If necessary, make adjustments to the
voltage regulator on the generator according to the
manufacturer’s recommendations to correct any
observed voltage deviations.
The following enclosure mounted status indicator
lights should be lit.
1.
Emergency Bypass Energized
2. Transfer Switch Isolated
3. Normal Source Available
4. Emergency Source Available
5. Load Energized
6. Normal Position Energized
ATS FUNCTIONAL TEST WITHOUT LOAD
TRANSFER
While the ATSBI Switch is in either Bypass position,
the ATS is isolated from the power circuits of both
sources. The ATS Logic Panel is, however, still
connected, via a test cable harness, to control
power enabling complete electrical and mechanical
testing of the ATS.
ENERGIZING ATS
Following the operational instruction label on the
enclosure front, proceed to energize the ATS by
opening the appropriate closed Bypass Switch and
placing the isolation Switch in the “ON” position.
Load circuits will now be connected to the ATS
power contacts.
The following enclosure mounted indicator lights will
be lit assuming availability of both sources.
1.
Normal Source Available
2. Emergency Source Available
3. Load Energized
4. Normal Position Energized
Once the ATS has been energized, the ATSBI
equipment is ready for standby service. Position the
Generator control selector switch to the auto start
position.
Additional functional load transfer tests may be
desirable including automatic engine start operation.
See ATS Controller Manual for additional testing and
troubleshooting information.
TRANSFER SWITCH REMOVAL
Cutler-Hammer Automatic Transfer Switches typically
do not require periodic maintenance or inspection
necessitating the removal of the ATS from service. If
removal is necessary, the following procedure
explains how to remoe the Automatic Transfer
Switch from service.
1.
Bypass and Isolate the Automatic Transfer
Switch by carefully following operational
instructions on previous pages. Verify that the
“Transfer Switch Isolated” is lit.
THE BYPASS-ISOLATION SWITCH IS STILL
ENERGIZED. CONTACT WITH ENERGIZED
COMPONENTS CAN CAUSE SEVERE PERSONAL
INJURY AND DEATH.
USE EXTREME CAUTION TO AVOID CONTACT
WITH THE BYPASS ISOLATION SWITCH.
2. Open enclosure doors(s) all the way and using a
voltmeter verify ABSENCE of voltage on all line
input terminals of both the Normal and
Emergency ATS Switches.
3. Disconnect plugs interconnecting the ATS power
panel with the logic panel.
4. Disconnect interconnecting bus bars terminating
on the Normal and Emergency switches line
input points (N1, N2, N3, E1, E2, E3 and N if
supplied).
5. Disconnect wiring to terminals which isolate
pilot circuits wired to the logic panel.
6. Remove bolts which hold the power panel to the
enclosure internal support brackets and lift the
power panel carefully forward through the
enclosure doors.
Effective July 2007 Supercedes I.L. 16913 dated February 1991
10
I.L. 16913A
DANGER
