IB140036EN
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Instruction Booklet
Effective: October 2014
Page
23
O&M Manual for 40-1200A (480/600 Vac) ATC-900 3-Position,
Open/Closed Transition Contactor Based Transfer Switch
6.2.1 Transfer Switch Appears Inoperative (Manual
Operation)
Step 1:
Initially verify that there is no voltage on any source
(Source 1 or Source 2) inside the transfer switch.
Step 2:
Depress the "TRIP" button located on the operating
mechanism of the contactor to bring the contactor to
neutral (trip) position.
Step 3:
Attach the handle to the manual lever (see Figure 16)
and rotate the lever up to go to Source 1.
Step 4:
Depress the "TRIP" button located on the operating
mechanism of the contactor to bring the contactor to
neutral (trip) position.
Step 5:
Depress the "SELECT" button located on the operating
mechanism of the contactor and rotate the lever up
keeping the "SELECT" button depressed to go to
Source-2.
Following above steps, if the transfer switch does not transfer
between two sources, contact factory personnel
MANUAL
HANDLE
OPERATING
SELECT BUTTON
TRIP BUTTON
Figure 16. Troubleshooting Manual Operation of the Transfer
Switch.
WARNING
HAZARDOUS VOLTAGES IN AND AROUND ATS EQUIPMENT DUR-
ING THE PROBLEM SOLVING PROCESS CAN CAUSE SEVERE PER-
SONAL INJURY AND/OR DEATH. AVOID CONTACT WITH ANY
VOLTAGE SOURCE WHILE PROBLEM SOLVING.
Section 7: Adjustments
7.1 General
No Adjustments are required.
