IB140012EN
For more information visit: www.eaton.com
Instructional Booklet
Effective: March 2021
Page
31
Operation and Maintenance Manual,
Automatic Transfer Switch Controller, ATC-900
Step 6:
Make sure that the setpoints are set according to the
system voltage.
If YES: Proceed to Step 7.
If NO: .Adjust system voltage setpoints to match sys-
tem voltage and phase.
Step 7:
Is the Non-preferred switching device charged?
If YES: Proceed to Step 8.
If NO: Consult Magnum Breaker troubleshooting manual
on how to charge the breaker before proceeding.
Step 8:
Is the Preferred switching device OPEN?
If YES: Proceed to Step 10.
If NO: Proceed to Step 9.
Step 9:
If this is a Magnum, measure the voltage between termi-
nals B10 and B11 on the Preferred switching device
(shunt trip). Is the voltage measured 120 Vac (+/- 10
volts)? Record the reading.
If YES: Refer to the Magnum Breaker maintenance
manual IB#2C12060 and check the shunt trip
Preferred switch.
If NO:
Check the wiring to B10 and B11.
Step 10:
If this is a Magnum measure the voltage between termi-
nals B12 and B13 on the Non-preferred switching device
(spring release coil). Is the voltage measured 120 Vac
(+/- 10 volts)? Record the reading.
If YES: Refer to the Magnum Breaker maintenance
manual IB#2C12060 and check the spring
release coil Non-preferred switching device.
If NO: Check the wiring to B12 and B13.
Step 11:
If a problem persists, contact Eaton.
Note:
After 10 minutes of inactivity, the display will go to a dim
state. Pressing any button will restore the display to its normal
brightness.
6.4 Replacement
Follow these steps to replace the ATC-900.
Step 1:
Turn off control power at the main disconnect or isola-
tion switch of the control power supply and lock it out to
guard against other personnel accidentally turning it on.
Step 2:
Verify that all “foreign” power sources wired to the ATS
Switch are de-energized. These 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 ensure reconnection
can be correctly performed. Taking a picture may help
with re-connections.
Step 4:
Disconnect all plugs and connectors going to the ATC-
900.
Step 5:
Remove the 6 mounting screws holding the unit against
the door or panel. These are accessed from the rear of
the unit.
Step 6:
Set the screws aside for later use.
Step 7:
Mount the replacement unit.
Step 8:
Secure the ATC-900 to the panel with the 6 mounting
screws.
Step 9:
Re-connect all plugs and connectors to their proper
socket on the ATC-900. Make certain that each plug is
securely seated.
Step 10:
Clear out all personnel, close all ATS panels, remove any
lockouts, and restore control power. Ensure all setpoints
are correct.
6.5 Maintenance and Care
The ATC-900 is designed to be a self contained and maintenance
free unit. The printed circuit boards are calibrated and conformally
coated at the factory. They are to be serviced by factory trained
personnel only. The front panel including the display can be
cleaned lightly with a soap and water mixture.
6.6 Firmware Upgrade
If a firmware upgrade is recommended, Eaton tech support will
provide you with a file download link. To upgrade the firmware,
please consult the instructions provided by Eaton tech support or
included with your firmware upgrade kit. After the USB thumb-
drive is inserted, the last item on the menu will turn blue. Select
the firmware file to update. Read the menus. It will take about 3
minutes to update.
* Ensure that power will not be removed during this upgrade.
Note:
The firmware upgrade is not the same as uploading or
downloading setpoints or downloading event information. See
Section 7.1 for instructions on extracting setpoint and event infor-
mation.
For ATS assistance, call Eaton Care at:
877-386-2273.
CAUTION
SUPPORT THE ATC-900 FROM THE FRONT SIDE WHEN THE
SCREWS ARE LOOSENED OR REMOVED IN STEP 5. WITHOUT SUCH
SUPPORT, THE UNIT COULD FALL AND THE PANEL COULD BE DAM-
AGED.
