Home Forums General Discussion Technical Questions Otis 311 shut down

Had 2 calls at different floors the elevator shut down level with floor doors closed. Now will not run on car top inspection, tries 3 times and shuts down and needs to be reset. Brake not lifting LB may be the problem, 120vac on A1 of LB contactor A2 goes through LVIB device and C/UDX to HL1 not sure what LVIB and C/UDX are. Not much info but I will be connecting tool tomorrow.

There are times even with the tool your trouble will be evasive. My last experience on a 311 with similar trouble ended up being a burnt wire right at the LB coil terminal. After stripping the lead back and reattaching it, a slow march through the controller with a screw driver revealed several terminals loose on a number of relays. And no brake switch on that unit either, but a brake board, so check the molex connector.
The faults you see with the tool will be a good help too, and be sure to view/record/clear the fault logs after each visit.

Turned the elevator back on the drive went dead after a couple of attempts to run on machineroom inspection and you could smell electrical. The drive is out for repair hopefully that was the original problem and the elevator will run when reinstalled.