IM05805022K
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Instruction Booklet
Effective: January 2012
Page
25
ATC-300+ Automatic
Transfer Switch Controller
Table 3. Troubleshooting Guide (Cont.)
7.3 ATC-300+ Replacement
Follow these procedural steps to replace the ATC-300+.
Step 1: Turn off the control power at the main disconnect or iso-
lation switch of the control power supply. If the switch
is not located within view from the ATC-300+, lock it
out to guard against other personnel accidentally turning
it on.
Step 2: Verify that all “foreign” power sources wired to the
ATC-300+ are de-energized. These foreign power
sources 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 assure that reconnec-
tion can be correctly performed. Make a sketch to help
with the task of terminal and wire identification.
Step 4: Remove all wires and disconnect plug-type connectors.
Step 5: Remove the four (4) 3/8 inch nuts, located on the four
corners, which hold the unit and trim plate against the
door or panel. These are accessed from the back of
the unit.
Step 6: Remove the unit from the door or panel. Lay the original
mounting screws aside for later use.
Step 7: Align the unit with the opening in the door or panel.
Step 8: Using the original mounting hardware, secure the
replacement unit to the door or panel.
Step 9: Using the sketch mentioned in Step 3, replace each wire
at the correct terminal and make sure each is secure.
Make certain that each harness plug is securely seated.
Step 10: Restore control power to the unit.
7.4 Maintenance and Care
The ATC-300+ is designed to be a self-contained and mainte-
nance-free unit. The printed circuit boards are calibrated and con-
formally coated at the factory. They are intended for service by
factory-trained personnel only.
SYMPTOM
PROBABLE CAUSE
POSSIBLE SOLUTION(S)
Unit will not perform an Engine Test.
Engine Test pushbutton was not pressed.
Display is not displaying the Home screen before initiating the test.
Engine Test setpoint is set to Disable (Value of “2”).
Generator became unavailable when connected to the load.
Generator became unavailable before connecting to the load.
Generator voltage and/or frequency did not become available within
90 seconds of engine starting.
Press the Engine Test pushbutton to initiate the test.
Use the Step/Enter pushbutton to step to the Home screen. If a
timer is timing down, wait until it is done.
Re-program the Engine Test setpoint.
Increase the Time Delay Emergency Fail (TDEF) timer setpoint.
Check the generator for proper function.
Verify the voltage and/or frequency with a multimeter. Check
the programmed setpoint values. Check the engine mainte-
nance.
Plant Exerciser failed to exercise.
Incorrect date or time setting.
Incorrect setpoint programmed for the PE DAY, PE HOUR, and/or PE MIN-
UTE.
Generator voltage and/or frequency did not become available within 90 sec-
onds of engine starting.
Generator became unavailable when connected to the load.
Generator became unavailable before connecting to the load.
Verify real time clock settings for the time and date.
Re-program the PE DAY, PE HOUR, and/or PE MINUTE setpoint.
Verify the voltage and/or frequency with a multimeter. Check
the programmed setpoint values. Check the engine mainte-
nance.
Increase the TDEF timer setpoint.
Check the generator for proper function.
Engine fails to start after the TDES times out.
Incorrect wiring.
Gen Start relay contacts are not closed.
Engine did not start.
Check the wiring between the Gen Start relay (J-5, Pins 13 and
14) and the engine.
Replace the unit.
Check the generator for proper function.
CAUTION
SUPPORT THE ATC-300+ FROM THE REAR WHEN THE SCREWS
ARE LOOSENED OR REMOVED IN STEP 5. WITHOUT SUCH SUP-
PORT, THE UNIT COULD FALL OR THE PANEL COULD BE DAM-
AGED.
