Eaton ATC-900 Operation And Maintenance Manual - page 24
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IB140064EN
Instructional Booklet
Page 24
Effective: April 2018
Operation and Maintenance Manual, Automatic Transfer Switch, Bypass Isolation,
Contactor Type, Open/Closed Transition, ATC-900 Controller, 3000A Frame
Figure 32. Contactor Racked Out for Removal.
6. If not in Automatic mode, simply turn the Operation Select
switch to Automatic. The controller will take over and put the
locked in contactor in the correct position and green lamp will
be on. In the Non-Auto position, the controller does not have
control (Monitor Mode).
7. To rack the contactor back into the cell (also see section 6),
push the green, open button to open the contacts and push in
(Figure 33), then simply ratchet in clockwise. Close the door
when the contactor reaches the isolated position (Status lamp
flashing once per second). Racking in more will cause the sta-
tus lamp to stay on. Once the status lamp goes to Off, turn
the ratchet until a hard stop occurs but do not over stress.
This is usually about one-two turns after the lamp goes to Off.
Note: DOOR YELLOW LAMP FLASHING
If the contactor is racked in (Status Lamp Off), and the Door’s Yellow light
flashes (Figure 30), simply close the shutter on the door and the Yellow
lamp will go off. The flashing is a reminder to close the wrench shutter.
Section 6: Draw-out, Racking-in, and Removal
of Either Contactor
6.1 Installing the Contactor Switching Device
The contactors are interlocked and removable as shown in Figure
32. The Bypass contactor is identical to the ATS contactor and
both are on slider rails as shown.
To install the contactor, check the indication flags to be sure it is
tripped open. Electrical interlocks are used to make sure the con-
tactor is tripped (if power is on) before it meets the rear stabs but
it is good practice to trip open. A 1/2 inch socket (Figure 11) and
ratchet with a double extension, will be required to rack the unit
in. The locked in contactor should remain closed at all times. With
the appropriate lifting device, carefully insert the contactor rollers
on top of the slides and push in the slides evenly as shown in Fig-
ure 34 to the stop and now it is ready to rack in.
Figure 33. Pushing in Contactor.
6.2 To RACK-IN ATS Contactor
WARNING
BY DIRECTING THE SOURCE SELECT SWITCH, THE USER COULD
SWITCH TO A SOURCE THAT IS NOT ENERGIZED OR IN THE OFF
POSITION, THEREFORE REMOVING POWER TO THE LOAD.
WARNING
HAZARDOUS VOLTAGES IN AND AROUND TRANSFER SWITCH
EQUIPMENT DURING THE TROUBLE SHOOTING PROCESS CAN
CAUSE PERSONAL INJURY AND/OR DEATH. WHILE ENERGIZED, AN
ARC FLASH AND SHOCK HAZARD EXISTS. CONSULT NFPA 70E
AND OSHA GUIDELINES FOR OPERATOR SAFETY PRIOR TO SERVIC-
ING, INSPECTING OR OPERATING EQUIPMENT.
IN ADDITION, IMPROPER OPERATION OF THE GENERATOR SET
PRESENTS A HAZARD THAT CAN CAUSE SEVERE PERSONAL
INJURY OR DEATH. OBSERVE ALL SAFETY PRECAUTIONS IN YOUR
GENERATOR SET OPERATIONS AND INSTALLATION MANUALS.
CAUTION
IT IS IMPORTANT TO TAKE GREAT CARE WHEN PLACING A DRAW-
OUT CONTACTOR DEVICE INTO THE EXTERNAL RAILS. IF THE
DEVICE IS NOT PROPERLY SEATED INTO THE RAILS, IT COULD FALL
OUT FROM THE RAILS CAUSING EQUIPMENT DAMAGE AND/OR
BODILY INJURY.
CAUTION
THE DOOR OF THE RACKED IN AND ENERGIZED CONTACTOR
SHOULD REMAIN CLOSED AT ALL TIMES.
CAUTION
TO RACK-IN, THE SWITCH DEVICE MUST BE IN THE TRIPPED (OPEN)
POSITION, AND THE DOOR IS CLOSED AND LATCHED FOR THE
LOCKED IN CONTACTOR.