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Old timer at the supply house told me to stop relying on factory wiring diagrams
I was wiring up a new MRL machine room less setup last week in a mid-rise in Austin and hit a snag with the controller. A guy named Tom who's been doing this since the 70s told me to ditch the factory diagram and trace it myself because they get updated but the prints don't always match. He was right about the encoder feedback loop being swapped on the print vs real world. Anyone else run into mislabeled diagrams on newer Otis or Schindler stuff?
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karen_sanchez104mo ago
Well now, I have to say I see it a little different. I've been doing this since the late 80s and I always start with the factory diagram, even if I know it might have mistakes. The problem with tracing it yourself from scratch is you can introduce your own errors, especially on these new MRL setups where the sequences are complex. I remember a job in Dallas where the print had the wrong limit switch numbers but using it as a base helped me double check my field work. Tom is right that you can't trust them blindly, but I think throwing them out altogether is asking for trouble.
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blakefox4mo ago
Tbh I'm with you on that, nothing beats the satisfaction of finding a factory print error and proving you're smarter than some guy at a desk in 1989.
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