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Instruction Booklet
Page 24 Effective: January 2012
ATC-300+ Automatic
Transfer Switch Controller
Section 7: Troubleshooting and
Maintenance
7.1 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-300+, the unit should be replaced with a new unit.
The malfunctioning unit should then be returned to EATON Electri-
cal for factory repairs.
7.2 ATC-300+ Controller 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,
contact EATON. If a problem is identified to be internal, the unit
should be returned to the factory for replacement.
Table 3. Troubleshooting Guide
NOTICE
WHILE PERFORMING TESTING, IF AN UNDESIRED OR UNDOCU-
MENTED RESULT OCCURS, FIRST CONTACT THE LOCAL EATON
FIRE PUMP CONTROLLER AGENT. IF THE RESULT IS NOT COR
-
RECTED, CONTACT THE TECHNICAL SUPPORT CENTER AT
+1-877-860-7955.
SYMPTOM PROBABLE CAUSE POSSIBLE SOLUTION(S)
All front panel indicator LED’s are off. Control power is deficient or absent.
ATC-300+ 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-300+ is malfunctioning.
Verify that control power is connected at J7 and that it is within
specifications.
Replace the unit.
One or more voltage phases read incorrectly. Incorrect wiring.
ATC-300+ is malfunctioning.
Verify voltage with multimeter. Check wiring.
Replace the unit.
Verify ground connection at J-5, Pin 12
Front panel pushbuttons do not work. Bad connection inside the ATC-300+. Replace the unit.
Unit did not accept new setpoints via front panel. Operator error.
No pushbuttons pressed for 2.5 minutes.
Enter the correct Password and change the setpoints.
Avoid intervals of 2.5 minutes of inactivity with pushbuttons
when changing setpoints.
Source 1 or Source 2 is not available when it should
be.
Voltage and/or frequency are not within setpoint values. Verify voltage and/or frequency with multimeter. Check the pro-
grammed setpoint values.
Unit displays “LOCK-OUT”. Lockout circuit wiring problem. Check lockout circuit wiring.
Unit displays “INHIBIT”. No contact closure at Emergency Inhibit Input Check Emergency Inhibit Wiring at J8, Pins 7 and 8.
Unit displays “SOURCE 1 DEVICE”. Source 1 closed contacts did not open when Source 1 breaker opened
(within 6 seconds).
Source 1 closed contacts did not close when Source 1 breaker closed
(within 6 seconds).
Check the Source 1 closed control input wiring on J-4, Pins 1
and 2 and J-8, Pins 1 and 2.
Check the Source 1 closed control input wiring on J-4, Pins 1
and 2 and J-8, Pins 1 and 2.
Unit displays “SOURCE 2 DEVICE”. Source 2 closed contacts did not open when Source 2 breaker opened
(within 6 seconds).
Source 2 closed contacts did not close when Source 2 breaker closed
(within 6 seconds).
Check the Source 2 closed control input wiring on J-4, Pins 3
and 4 and J-8, Pins 3 and 4.
Check the Source 2 closed control input wiring on J-4, Pins 3
and 4 and J-8, Pins 3 and 4.
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