Some of those door switches are a bit grumpy though, relay chatter from them. You have any old Express units by you with those shaft tappet switches that love to give hassles?
There was one lift witch similar chattering problem, it was caused by wrong regulation of door drive, once fully opened the door contactor releases and door motor is kept at lovered voltage just to withstand the landing door spring. But here the motor has too low or now power after that and spring closes the door back, door open contactor activates, motor runs at higher power, door starts to reopen... and this repeats again, again and again. There is video with this, look at 3:28 fragment: ua-cam.com/video/urDljM07gaA/v-deo.html Someday i will publish a full movie about this particular case.
Some of those door switches are a bit grumpy though, relay chatter from them. You have any old Express units by you with those shaft tappet switches that love to give hassles?
There was one lift witch similar chattering problem, it was caused by wrong regulation of door drive, once fully opened the door contactor releases and door motor is kept at lovered voltage just to withstand the landing door spring. But here the motor has too low or now power after that and spring closes the door back, door open contactor activates, motor runs at higher power, door starts to reopen... and this repeats again, again and again.
There is video with this, look at 3:28 fragment: ua-cam.com/video/urDljM07gaA/v-deo.html
Someday i will publish a full movie about this particular case.