IB01602019E
For more information visit: www.eaton.com
Instructional Booklet
Effective: March 2010
Page
15
O&M Manual for the Eaton ATC-100
Automatic Transfer Switch Controller
5.3 ATC-100 Replacement
Follow these procedural steps to replace the ATC-100.
Step 1:
Turn off the control power at the main disconnect or iso-
lation switch of the control power supply. If the switch
is not located within view from the ATC-100, lock it out
to guard against other personnel accidentally turning it
on.
Step 2:
Verify that all “foreign” power sources wired to the
ATC-100 are de-energized. These foreign power
sources may also be present on some of the terminal
blocks.
Step 3:
Before disconnecting any wires from the unit, make sure
they are individually identified to assure that reconnec-
tion can be correctly performed. Make a sketch to help
with the task of terminal and wire identification.
Step 4:
Remove all wires and disconnect the plug-type connec-
tors.
Step 5:
Remove the four (4) mounting screws, located on the
four corners, that hold the unit and trim plate against
the door or panel. These are accessed from the front of
the unit. Support the unit and remove the two center
screws.
Step 6:
Remove the unit from the door or panel. Set the original
mounting screws aside for later use.
Step 7:
Align the unit with the opening in the door or panel.
Step 8:
Using the original mounting hardware, secure the
replacement unit to the door or panel.
Step 9:
Using the sketch mentioned in Step 3, re-connect each
wire at the correct terminal and make sure each is
secure. Make certain that each harness plug is securely
seated.
Step 10:
Restore control power to the unit.
5.4 Maintenance and Care
The ATC-100 is designed to be a self-contained and maintenance-
free unit. The printed circuit board is conformally coated at the
factory. The ATC-100 is intended for service by factory-trained
personnel only.
CAUTION
SUPPORT THE ATC-100 FROM THE REAR WHEN THE SCREWS ARE
LOOSENED OR REMOVED IN STEP 5. WITHOUT SUCH SUPPORT,
THE UNIT COULD FALL OR THE PANEL COULD BE DAMAGED.
