ASCO Series 300 ATS No Transfer
ASCO Series 300 ATS No Transfer
(OP)
Hey guys, hopefully someone can help me with this issue. I have an ASCO series 300 ATS 3 phase 120/208 400 Amps. When utility power fails it sends the signal to start the generator as it should, but it does not transfers to emergency. I have check voltage line to line and to neutral and hertz and everything seems correct. Even the emergency power available light at the membrane is lit. I manually transfer to emergency and when utility returns it will retransfer and shut down the unit properly. I removed the control board and installed on another ATS same voltage and amps, and it works perfectly. Just in case I also replaced the rectifier bridge with no results. The coil seems to be working since it retransfers. I have talk to ASCO but they pretty much want to send a tech to verify the unit. What am I missing?? I will appreciate any advise.
Kind regards
Kind regards






RE: ASCO Series 300 ATS No Transfer
RE: ASCO Series 300 ATS No Transfer
RE: ASCO Series 300 ATS No Transfer
RE: ASCO Series 300 ATS No Transfer
P2 is the transfer to emergency timer and P1 is the retransfer to normal timer. Wipe P2 potentieter back can forth, perhaps it is not making good contact.
Check the sensor setting, page 4-1.
Trouble shooting checks, Table 3-1.
Good luck
RE: ASCO Series 300 ATS No Transfer
Check the frequency set-up. 50hz or 60 Hz.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: ASCO Series 300 ATS No Transfer
RE: ASCO Series 300 ATS No Transfer
RE: ASCO Series 300 ATS No Transfer
RE: ASCO Series 300 ATS No Transfer
RE: ASCO Series 300 ATS No Transfer
In your original question you indicated you did as such took the board and place it in another unit at it worked. Have you tried taking the other unit's board and tried in on the original Asco switch ? We would be looking results that it "did NOT work", so that it would indicate something in the Switch and not the board, and 2 workings boards did not made the switch transfer. Now we just trouble shoot all else external to the baord.
RE: ASCO Series 300 ATS No Transfer
RE: ASCO Series 300 ATS No Transfer
This leads to another suggestion; Are the line and emergency leads switched?? Probably not or you wouldn't get a generator start signal.
Take a close look at the micro switches that Wayne440 mentions.
Bill
--------------------
"Why not the best?"
Jimmy Carter