The ATC-300 Automatic Transfer Switch is a generator-set controller. It is used on generator sets from Atc-300, including the ATC-300.
| Symptom | Cause | Remedy |
|---|---|---|
| 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. |
| Display is not displaying the Home screen before initiating the test. | Engine Test setpoint is set to Disable (Value of “2”). | Re-program the Engine Test setpoint. |
| Engine did not start. | Check the generator for proper function. | |
| Engine fails to start after the TDES times out. | Incorrect wiring. Gen Start relay contacts are not closed. | Check the wiring between the Gen Start relay (J-5, Pins 13 and 14) and the engine. Replace the unit. |
| Front panel pushbuttons do not work. | Bad connection inside the ATC-300. | Replace the unit. |
| Generator became unavailable when connected to the load. | Check the generator for proper function. | |
| Generator voltage and/or frequency did not become available within 90 seconds of engine starting. | Verify the voltage and/or frequency with a multimeter. Check the programmed setpoint values. Check the engine maintenance. | |
| Number of generators setpoint is set to 0. | Re-program the number of generators setpoint. | |
| One or more voltage phases read incorrectly. | Incorrect wiring. ATC-300 is malfunctioning. | Verify voltage with multimeter. Check wiring. Replace the unit. |
| Plant Exerciser failed to exercise. | Incorrect date or time setting. | Verify real time clock settings for the time and date. |
| 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 programmed setpoint values. |
| 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. |
| Unit displays ‘LOCK-OUT’. | Circuit breaker tripped. Lockout circuit wiring problem. | Check for a overload/short circuit condition Check lockout circuit wiring. |
| Unit displays ‘SOURCE 1 DEVICE’. | 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). | 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 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 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). | 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 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. |
| Unit will not perform an Engine Test. | Engine Test pushbutton was not pressed. | Press the Engine Test pushbutton to initiate the test. |
| ‘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. |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.