Instructional Booklet
Page
28
Effective: March 2021
Operation and Maintenance Manual,
Automatic Transfer Switch Controller, ATC-900
For more information visit: www.eaton.com
IB140012EN
Section 6: Troubleshooting and Maintenance
6.1 Level of Repair
This manual is written with the assumption that only transfer
switch system troubleshooting will be performed. If the cause of
malfunction is traced to an ATC-900, the malfunctioning unit
should be returned to Eaton for a replacement.
ATC-900 Generic Part Numbers:
ATC-900 Eaton Open Transition 8160A90G01
ATC-900 Eaton Closed Transition 8160A90G64
DCT Module part number 70C1778G01
I/O module part number 70C1776G01
6.2 ATC-900 Device Troubleshooting
The Troubleshooting Guide (Table
9
) is intended for service per-
sonnel to identify whether a problem being observed is external or
internal to the unit. For assistance with this determination, con-
tact Eaton. If a problem is identified to be external to ATC-900,
proceed to Section 6.3 and continue troubleshooting.
In a mission critical application, failure to transfer to the back-up
power power system requires quick and decisive action. The
ATC-900 provides users with data to help quickly identify the root
cause of the issue and minimize system downtime. Historical
Data, Event Details, and Hi-Speed Capture allows one to diagnose
the problem quickly and accurately. Please refer to Section 7 (His-
torical and Event Display) for displaying the information. The infor-
mation can also be downloaded using a memory stick (USB port)
and put on a Windows PC for viewing in Microsoft Excel.
If a red fault message is flashing on top of the display and the
cause of the fault is resolved, simply press "Help" and then
"Enter" and the message will be removed.
Power Isolation Requirements: Control power for Source 1, J7-
1,2 must be electrically isolated from control power for Source 2,
J7-3,4. Similar for accessory I/O Module on J1-1,2 and J1-3,4
for S1 and S2 respectively.
Table 9. Troubleshooting Guide.
For ATS assistance, call Eaton Care at:
877-386-2273
NOTICE
DURING CONVERSATIONS WITH EATON CONCERNING TROUBLE-
SHOOTING OR PRODUCT RETURN, THE CUSTOMER MAY BE ASKED
FOR INFORMATION PERTAINING TO THE SOFTWARE VERSION AND
OPTIONS INCLUDED IN THE SPECIFIC UNIT. THE SYSTEM INFO
SCREEN HAS THE DATA REQUIRED FOR THE CONTROLLER. IF THE
CONTROLLER IS NOT FUNCTIONAL USE THE LABEL ON THE BACK
OF THE UNIT.
SYMPTOM
PROBABLE CAUSE
POSSIBLE SOLUTION(S)
All front panel indicator LED’s are off.
Control power is deficient or absent.
ATC-900 is malfunctioning.
Verify that control power is connected at J7 and that it is within specifications.
Replace the unit.
Automatic LED is not blinking.
Control power is deficient or absent.
Stuck waiting for Neutral position
ATC-900 is malfunctioning
Verify that control power is connected at J7 and that it is within specifications.
Mechanical problem; No inputfrom limit switch.
Replace the unit.
One or more voltage phases read incorrectly. Incorrect wiring.
ATC-900 is malfunctioning.
Verify voltage with multimeter. Check wiring.
Replace the unit.
Front panel pushbuttons do not work.
Bad connection inside ATC-900.
Replace the unit.
Unit did not accept new setpoints via front
panel.
Operator error. Make sure "Enter" is pressed when completed.
No pushbuttons pressed for 2.5 minutes.
See Section 5 for rules on programming setpoints.
Avoid intervals of 2.5 minutes of inactivity with pushbuttons when changing set-
points.
Voltage dropout and pickup setpoints are dif-
ferent than what was programmed.
Adjusted nominal voltage setpoint.
Re-adjust all dropout and pickup setpoints to default values.
Frequency dropout and pickup setpoints are
different than what was programmed.
Adjusted nominal frequency setpoints.
Re-adjust all dropout and pickup setpoints to default values.
Changed undervoltage, overvoltage, underfre-
quency, or overfrequency dropout setpoint
and the pickup setpoint changed also.
Pickup upper or lower limit ranges are dependent upon dropout
setpoints. To prevent misapplication, they are automatically
adjusted when overlapping occurs.
Source 1 or Source 2 is not available when it
should be.
Voltage and/or frequency is not within setpoint values.
Verify voltage and/or frequency with multi-meter.
Check programmed setpoint values.
Source 1 or Source 2 is not shown connected
when it should be.
No input from S1 or S2 aux contacts.
ATC-900 is malfunctioning.
Verify contact closure at desired control input on J4.
Replace the unit.
Engine fails to start after TDES times out.
S1 or S2 Generator start relay contacts not closed.
Incorrect wiring at generator.
Replace the unit.
Check engine wiring/maintenance.
Engine starts at 2 minutes with TDES set over
2 Minutes.
Any TDES value above two minutes, with no power on the con-
troller, will start the generator (fail-safe) after two minutes.
Power Controller with UPS or 24VDC (using DCT).
Engine fails to turn off after TDEC times out. S1 or S2 Generator start relay contacts not open.
Incorrect wiring at generator.
Connected LED not lit for either source.
Replace the unit.
Check engine wiring.
Verify contact closure at desired control input on J4. Replace the unit.
Unit will not perform an Engine Test.
Incorrect password after Test button was pushed
Engine Test setpoint is set to Disabled.
Number of Generators setpoint is set to 0.
Re-enter correct password. The factory password is 0900
Re-program Engine Test setpoint.
Re-program Number of Generators setpoint.
Switch does not perform correctly
Assure correct Switch Type is programmed in the ATC-900 con-
troller
In the System menu screen 4 of 4, program the correct user switch. See section
4.3
