OP
- Reaction score
- 1,053
Not sure on who built it, its quite old, I'll see if I can find out.Is this a Wadsworth lift by any chance?
All I know is that its an Otis type.
Discuss Goods Lift Brake Solenoid Not Operating Correctly in the Industrial Electrician Talk area at ElectriciansForums.net
Not sure on who built it, its quite old, I'll see if I can find out.Is this a Wadsworth lift by any chance?
Thanks for the heads up,
Fortunately I'm not responsible for this repair, basically just an interested party. I wouldn't normally get involved with the control side of lifts as I have no experience at all in this field. Like I state, I was asked to have a quick look and you could clearly see the brake not disengaging properly causing the squeal as it bound on. You could see the armature move back to open the brake shoes but there appeared to be not enough clearance. It appeared as though the return spring was too strong and the armature shaft was not moving fully in position.
Since this brake system had been removed and fully re-furbished, my first question was regarding the adjustment, and the engineer told me that it was adjusted, set and tested as per design spec. Obviously I'm in no position to argue this. The cover was off to the terminals of the solenoid so as they tried the lift and the brake attempted to dis-engage I tested across the terminals a couple of times. This is when I got the 169/170V ac readings. The I.D plate though not clear appears to state 185V dc.
So, with no experience in these matters my assumption is/was that the applied voltage was firstly ac not dc and secondly too low to operate the solenoid as it was designed to do, thus causing the brake to bind on.
The lift is now back in operation, so I assume the problem sorted, though I have no details on what was done to achieve this.
Good adviceHi,in connection with the topic,might i suggest the OP ensures any possible future liability risks,in testing or altering this braking system.
Having had many involvements in similar devices,any issue or mishap,at any time in the future,will be firmly dropped in the lap of the last-to-touch.
It usually is not the 12 people hurtling via gravity to doom,in a goods lift they should not have entered....
...it will be the 1" misalignment or slip,which catches a toe or finger,followed by the wait in casualty,watching the waiting room TV,with it's blame hunting brief ad's...
Be 100% sure of two things...
1) The squealing you mention,is not a siezed or failing shaft/coupling,resonance on one or more reeving falls,or a sheaving fault.
2) It's not you who gets the curly finger ?
Reply to Goods Lift Brake Solenoid Not Operating Correctly in the Industrial Electrician Talk area at ElectriciansForums.net
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