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Learned the hard way about door lock timing at a 12-story office tower in Cleveland
Had a call last Tuesday where the elevator kept stopping 6 inches off level. Turns out the door lock sequence was off by just a few milliseconds. Anyone else run into this with newer Schindler controllers?
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corac911mo ago
Another thing nobody seems to talk about with these newer Schindler controllers is how sensitive they are to voltage dips from the building's backup generator. We had a job where the door lock timing was drifting on the 8th floor only during generator tests on Tuesday mornings. Turned out the generator kicking on was causing a 2 volt sag that was just enough to mess with the controller's timing circuit. The main power was fine, but that backup line was a total nightmare. Nobody ever checks that.
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nina1471mo ago
Oh man, you hit the nail on the head. We had a similar nightmare with a Schindler 5500 in a hospital building last year. The door lock timing was off by 8 milliseconds and it caused the doors to bounce back open on like every third floor. Took us forever to track it down because the controller wasn't throwing any codes just acting squirrelly. Ended up having to pull the door operator schematic and manually adjust the cam timing to fix it.
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Not sure I'd call it a total nightmare, sounds more like a minor headache you eventually sorted out. @nina147 I get that 8 milliseconds can throw things off but most schindler controllers are pretty solid with backup power issues. Feels like a lot of people are making a mountain out of a molehill with these timing problems.
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