FAQ

Rev. A 4
Why won’t the generator shut down?
1. Generator is still running on cool-down state. Approximately 5 minutes.
2. If the ATS has transferred to the utility source and the generator is still running after 5 minutes, check if generator
has its own cool-down timer/setting. Contact local generator supplier
3. If the generator has no cool-down timer but is still running after 5 minutes, check the engine start contacts on the
transfer switch.
4. If there is continuity on the N.O. contacts (no continuity on the N.C. contacts) and switch is connected to the utility
source, the controller may be non-conforming. Controller should be replaced.
Note: Checking these items requires an ASCO Services technician or a licensed electrician!
Why doesn’t the ATS transfer to emergency?
1. Verify that the generator accepted light is on. The ATS will not transfer load to an unacceptable source.
Check generator breaker. Contact local generator supplier.
2. Voltage across the emergency terminals is not acceptable.
3.
The generator frequency is too low or too high.
4.
The solenoid operator is non-operational.
5. The controller is non-operational.
Note: Checking these items requires an ASCO Services technician or a licensed electrician!
Why won’t the engine start contacts work?
Conduct a “transfer test.” The engine start contacts should change position. If they don’t, controller may need to be
replaced.
Contact an ASCO Services technician or a licensed electrician!
Why does the generator crank up when load is connected to the utility and then
shuts down when utility fails?
1. Controller does not sense the proper outage of the normal / utility source. May need to be replaced.
Why won’t the utility acceptable LED light up?
1. Normal/utility source is not acceptable. Voltage and/or frequency are not within acceptable parameters.
2.
Utility breaker is OFF. Turn the breaker ON.
3. LED has malfunctioned; contact Parts Department or local distributor and replace LED.
Verify if the transfer switch harness is connected properly to the controller.
Note: Checking this item requires an ASCO Services technician or a licensed electrician!