Generac 20kw will not transfer back to line power!
Posted: Wed Aug 07, 2019 9:48 pm
Model number is 20KW/999 GUARD+ 200A SE A, SERIAL IS 6716951 - The power went out due to lightening hitting a high voltage transformer. The Gen took over automatically and is still running, but the line power has been restored! First thing I tried was to cut the system off and then reset the line/standby switch. I could not get it to reset so So pushed the trip button and then got it to reset after some time. I then set the Gen back to auto and the Gen displayed something like ,"no line voltage starting 10 second countdown". After the countdown the Gen started and the line/standby switch went back to standby. We do have power but it is from the Gen and not from the line power. I read through the "not resetting threads" and did not find anything just like our situation. I did a continuity check of the 3 fuses taken from the ATS and they seem intact. I took off the 23 wire? from the ATS and the system did not revert to line power. I checked the voltage bet. 23 and 193 (I think) with Gen off and it was 11.3vdc. - it was 0vdc when Gen was cut back on (may have this reversed, can't remember which way it was. I have looked at the DIAGnostics and they did not help. I do not know where to go from here - I have not looked at voltages on the ATS relay or limit switch & not certain how to get to them. I have not checked the electronics in the Gen yet, suppose I would have to take the numerous screws off to get to the wiring harness & relay there as well. Any hints would be grand, as I have only done PM on this unit over the last 7 3/4 years. ATS BOX had not been opened since the contractor installed it in Dec 2011 until today!
