My concern is the MHC board is going bad. We reset the unit and ran it for 3 hours with out any more signs of trouble. Has any one run into a similar situation? Any suggestions would be welcome.
Thanks
Selector reset T69 contact or wiring? Stack switch problem?
DS29 is the deadmans timer
Thanks for the feed back!
While we were running the car in the up direction the car didn't leave the floor. The valve coils didn't energize and HS relay didn't pull in. One of us and the building maintenance guys were in the elevator. So I had to shut it off and on to let them out. And noe hours later nothing. The only thing I have found is a loose nc aux contact on wye. But the intermittent car call cancel and the unexplained desire to relevel remain.
Any suggestions would be appreciated. Thanks
Sounds like it did not transfer to Delta. Can you recreate the scenario, and see if the Y-D transfer is functioning normally? Or maybe this problem isn't occuring anymore? Did fixing that loose wire take care of this?
"the unexplained desire to relevel remain."
Could it be just warming the oil? I mean, is it level, when the pump is running, with no valve coils energized? That't indicative of an oil warming routine.
We were able to run the car until some trouble occurred. Once we had this condition DS29 was blinking on the MHC board. The decimal point stopped blinking and it indicated the car was at 6 one floor above the top floor. We then started to pull connectors to see if DS29 blink pattern would change. We pulled every connector off the board down with no change.
I believe its the MHC board... We are pulling it as soon as the customer approves our PO.