have you ever been in an elevator waiting for the doors to close when the elevator “hiccups”, jolting you up and down rather quickly over a miniscule distance. Why do elevators do this, and is it just the pneumatic lift type??? I’ve never noticed a pattern…
I hate when that happens!
It’s the Rise Of The Machines … the elevator is trying to break free of the iron fist of preprogrammed activities and strike out against the foul human overlords in any way it can.
I do not know of any pneumatic elevators.
One reason on a cable elevator is dirty contacts. Elevator stop, a little short or over the landing, one of the contacts on a controler makes mechanical contact, but due to contact not being clean not electical contact instantly. Then contact is made. Brake gets pulled in motor contacts pull in and bumps elevator down maybe 1/2 inch. As it starts to move contact opens, motor relay drops out, and a moment later brake drops. What can also happen is the car can drift back up remake the contact before the brake full drops. So it will keep repeating.
Not pneumatic; hydraulic.
Yes that was my point.
With Speed:
Get you to within a few inches of the floor quickly; stop suddenly; and adjust abruptly to align elevator with floor.
Bing, Bam, Boom – you’re done.
With Smoothness:
The other option is a more sophisticated and progressive slowing of the elevator, as it crawls to a much more precise stop…slowly…slowly…and…almost perfectly there…a very smoooooth, slllllooooow stop.
Speed wins.
.