Troubleshooting And Maintenance - Eaton ATC-300 Mode D'emploi

SECTION 7: TROUBLESHOOTING AND
MAINTENANCE
7.1 Level of Repair
This manual is written with the assumption that only ATS
troubleshooting will be performed. If the cause of malfunc-
tion is traced to an ATC-300, the unit should be replaced
with a new unit. The malfunctioning unit should then be
returned to EATON Electrical for factory repairs.
7.2 ATC-300 Controller Troubleshooting
The Troubleshooting Guide (Table 3) is intended for service
personnel to identify whether a problem being observed is
external or internal to the unit. For assistance with this deter-
mination, contact 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
All front panel indicator LED's are off.
"Unit Status" LED is not blinking.
One or more voltage phases read
incorrectly.
Front panel pushbuttons do not work.
Unit did not accept new setpoints via
front panel.
Source 1 or Source 2 is not available
when it should be.
Unit displays "LOCK-OUT".
Unit displays "SOURCE 1 DEVICE".
Unit displays "SOURCE 2 DEVICE".
IB01602001T
ATC-300 Automatic
Transfer Switch
Controller
Probable Cause
Control power is deficient or absent.
ATC-300 is malfunctioning.
Control power is deficient or absent.
ATC-300 is malfunctioning.
Incorrect wiring.
ATC-300 is malfunctioning.
Bad connection inside the ATC-300.
Operator error.
No pushbuttons pressed for 2.5 minutes.
Voltage and/or frequency are not within setpoint values.
Circuit breaker tripped.
Lockout circuit wiring problem.
Source 1 breaker/contactor did not open when it was
commanded to open (within 6 seconds).
Source 1 breaker/contactor did not close when it was
commanded to close (within 6 seconds).
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).
Source 2 breaker/contactor did not open when it was
commanded to open (within 6 seconds).
Source 2 breaker/contactor did not close when it was
commanded to close (within 6 seconds).
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).
For more information visit: www.eatonelectrical.com
Effective: January 2006
.
Verify that control power is connected at J7
and that it is within specifications.
Replace the unit.
Verify that control power is connected at J7
and that it is within specifications.
Replace the unit.
Verify voltage with multimeter. Check wiring.
Replace the unit.
Verify ground connection at J-5, Pin 12
Replace the unit.
Enter the correct Password and change the set-
points.
Avoid intervals of 2.5 minutes of inactivity with
pushbuttons when changing setpoints.
Verify voltage and/or frequency with multime-
ter. Check the programmed setpoint values.
Check for a overload/short circuit condition
Check lockout circuit wiring.
Check the Source 1 circuit breaker shunt trip
(ST) wiring.
Check the Source 1 circuit breaker spring
release (SR) wiring.
Check the Source 1 closed control input wiring
on J-4, Pins 1 and 2.
Check the Source 1 closed control input wiring
on J-4, Pins 1 and 2.
Check the Source 2 circuit breaker shunt trip
(ST) wiring.
Check the Source 2 circuit breaker spring
release (SR) wiring.
Check the Source 2 closed control input wiring
on J-4, Pins 3 and 4.
Check the Source 2 closed control input wiring
on J-4, Pins 3 and 4.
Instruction Booklet
Page 23
Possible Solution(s)