IB01602078E
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Instruction Booklet
Effective: September 2011
Page
21
40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
Section 5: Operation
5.1 General
An ATS provides a power contactor to connect and disconnect
the load to and from the Source 1 and Source 2 power sources
(Section 3.2.1).
5.2 Manual Operation
WARNING
DO NOT ATTEMPT TO MANUALLY OPERATE THE ATS WITH
SOURCE 1 OR SOURCE 2 AVAILABLE.
WARNING
HIGH VOLTAGES ARE PRESENT IN AND AROUND TRANSFER
SWITCH EQUIPMENT. BEFORE ATTEMPTING TO MANUALLY
TRANSFER, DISCONNECT THE LINE POWER FROM THE EQUIP-
MENT BEING SERVICED BY OPENING AND LOCKING OUT, IF POSSI-
BLE, THE NEXT HIGHEST DISCONNECT DEVICE. FAILURE TO
FOLLOW THIS PROCEDURE COULD CAUSE SEVERE PERSONAL
INJURY AND/OR DEATH.
ALWAYS TURN THE SOURCE 1 POWER OFF AND TURN THE
SOURCE 2 (IF A GENERATOR) CONTROL SELECTOR SWITCH TO
THE “OFF” POSITION BEFORE ATTEMPTING A MANUAL TRANS-
FER.
To manually operate:
1. Disconnect all sources of power.
2. Disconnect the J7 connector from the ATC-300+ controller.
3. Locate the manual lever on the left side of the contactor.
4. Locate the handle used to manually transfer the switch.
5. Attach the handle to the manual lever (See Figure 18).
6. Rotate the lever down to go to open or trip the unit.
7. Depress the “close” button located on the operating mecha-
nism of the contactor to bring the contactor to the Source-1
position.
8. Rotate the lever down to open or trip the unit.
9. Depress the “source select” button on the operating mecha-
nism of the contactor and depress the “close” button while
keeping the “source select” button depressed to go to
Source-2.
Figure 18. ATS Manual Operating Handle in Use.
10. Once the manual operation is complete and automatic opera-
tion is desired, connect the sources of power.
11. Check for 120 Vac at J7-2 to J7-1 if Source 1 is available.
12. Check for 120 Vac at J7-4 to J7-3 if Source 2 is available.
See the Troubleshooting Guide (Table 3, Section 6 of ATC-
800 Controller Instruction Booklet I.B. ATS-C103) if values
are above 130 Vac or below 110 Vac.
13. Insert the J7 connector into the controller.
14. Follow the testing procedure in Section 6 to ensure proper
automatic operation.
