The car will run all day but some time over the night it will get a re-leveling fault then the low oil timmer will kick in. I sat here one night watching this car and of course it ran perfect all night and into the following morning. But since then it is constantly found at the bottom terminal landing with the re-leveling fault / low oil. So I know it's attempting to re-level at some point then low oil will time out. However, it works fine all day long and will also re-level as needed.
I've changed out the HU sensor which gave me a positive response for about 3 days. Then, back to being down every morning. I went ahead and replaced the other 3 sensors but the issue continues to return. All boards appear to to be fine but who know's, again, the car runs all day long.
In an earlier post someone mentioned the cold oil start could possibly be pushing the car up causing a re-leveling fault. They recommended backing out BP but when I arrived on this job cold oil was already disabled. With that said, I wired it back in with hopes for a lucky longshot and wasn't very optimistic about this resolving my issue. Needless to say the problem is still there.
Does anyone have any suggestions? I have the HTT tool which honestly seems very limited although, at least I see the faults. If a board replacement is suggested please specify which one and your opinion on why this would happen overnight.
Any help would be greatly appreciated.
Thanks again!
Haven't run into that on an mph yet. Although I've seen similar issues on other units.
I recommend the following,
1) disabling the hall calls
2) call the car to the bottom landing
3) shut off the main line
4) place a gauge on the valve
5) close the shut off between the jack and pump unit
6) give it 15 minutes and check if the car is still level and the gauge held pressure
7) open the shut off valve
8) turn the power back on
9) bleed the manual lowering valve repeatedly re level the car
10) observe your starter (solid state, wye delta, across the line?)
Let's see if we can recreate the trouble consistently.
Do you guys believe this is more of a valve problem? I opened up all stems which I cleaned out a very minimal amount of gunk which did happen to change the way the car operated. I had to do a little more adjusting to get the car level at the landing zones again, this was after the valve stems were cleaned. Pressures do hold and there is never any oil loss. I can't see this being an electrical problem at this point but the strange thing is that it only faults out overnight, and of course when it's not being observed.
Really appreciate all of your help, I've been working on elevators for 20 years and I can honestly say this is one of the strangest. I Just wanted to reduce the cost by making the right decision on what to replace.
The valve is an EECO UV5 about 15 years old.
Thanks again,