Instructional Booklet
Page
14
Effective: March 2010
O&M Manual for the Eaton ATC-100
Automatic Transfer Switch Controller
For more information visit: www.eaton.com
IB01602019E
Section 5: Troubleshooting and Maintenance
5.1 Level of Repair
This manual is written with the assumption that only ATS trouble-
shooting will be performed. If the cause of malfunction is traced
to an ATC-100, the unit should be replaced with a new unit. The
malfunctioning unit should then be returned to Eaton Electrical,
Inc. for factory repairs.
5.2 ATC-100 Troubleshooting
The Troubleshooting Guide (Table 3) 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 Electrical. If a problem is identified to be internal, the
unit should be returned to the factory for replacement.
Table 3. Troubleshooting Guide.
SYMPTOM
PROBABLE CAUSE
POSSIBLE SOLUTION(S)
All front panel LED’s are off.
Control power is deficient or absent.
ATC-100 is malfunctioning.
Verify that control power is connected at J7 and that it is within
specifications.
Replace the unit.
“Unit Status” LED is not blinking.
Control power is deficient or absent.
ATC-100 is malfunctioning.
Verify that control power is connected at J7 and that it is within
specifications.
Replace the unit.
Front panel pushbuttons do not work.
Bad connection inside the ATC-100.
Replace the unit.
Utility source or Generator source is not available
when it should be.
Voltage and/or frequency are not within set-point values.
Verify voltage and/or frequency with multimeter. Check the pro-
grammed setpoint values.
“Utility Connected” LED is blinking.
Utility switching device did not open when it was commanded to open
(within 6 seconds).
Utility switching device did not close when it was commanded to close
(within 6 seconds).
Utility closed contacts did not open when Utility switching device opened
(within 6 seconds)
Utility closed contacts did not close when Utility switching device closed
(within 6 seconds).
Check the utility circuit breaker shunt trip (ST) wiring.
Check the utility circuit breaker spring release (SR) wiring.
Check the utility closed control input wiring on J-4, Pins 1 and 2.
Check the utility closed control input wiring on J-4, Pins 1 and 2.
Press Reset pushbutton on rear of unit to reset the fault.
“Generator Connected” LED is blinking.
Generator switching device did not open when it was commanded to open
(within 6 seconds).
Generator switching device did not close when it was commanded to
close (within 6 seconds).
Generator closed contacts did not open when Generator switching device
opened (within 6 seconds).
Generator closed contacts did not close when Generator switching device
closed (within 6 seconds).
Check the generator circuit breaker shunt trip (ST) wiring.
Check the generator circuit breaker spring release (SR) wiring.
Check the generator closed control input wiring on J-4, Pins 1 and 3.
Check the generator closed control input wiring on J-4, Pins 1 and 3.
Press Reset pushbutton on rear of unit to reset the fault.
“Generator Available” LED is blinking.
Generator source voltage and/or frequency were not within setpoint val-
ues within 90 seconds of trying to execute a System Test, Engine Start,
or Generator Test.
Verify generator voltage and/or frequency with multimeter. Check
the engine maintenance.
Press Reset pushbutton on rear of unit to reset the fault.
Unit will not perform an Engine Start test.
Engine Start pushbutton was not pressed.
Generator source voltage and/or frequency did not become available
within 90 seconds of engine starting.
Press and hold (for 5 seconds) the Engine Start pushbutton to ini-
tiate the test.
Verify the voltage and/or frequency with a multimeter. Check the
engine maintenance.
Unit will not perform a System Test.
System Test pushbuttons were not pressed.
Generator source became unavailable when connected to the load.
Generator source became unavailable before connecting to the load.
Generator source voltage and/or frequency did not become available
within 90 seconds of engine starting.
Simultaneously press the Engine Start and Set Generator Test push-
buttons to initiate the test.
Check the generator/load sizing.
Check the generator for proper function.
Verify the voltage and/or frequency with a multimeter. Check the
engine maintenance.
Generator Test failed to exercise.
Generator source voltage and/or frequency did not become available
within 90 seconds of engine starting.
Generator source became unavailable when connected to the load.
Generator source became unavailable before connecting to the load.
Verify the voltage and/or frequency with a multimeter. Check the
engine maintenance.
Check generator/load sizing.
Check the generator for proper function.
Engine fails to start after the TDES timer times out. Incorrect wiring.
Generator Start relay Normally Open contacts are not closed.
Engine did not start.
Check the wiring between the Generator Start relay (J-5) and the
engine.
Replace the unit.
Check the generator for proper function.
