- This topic has 7 replies, 2 voices, and was last updated 9 years ago by
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Wessex Vertical Seat
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Think I have something I drew to show circuits from motor head to carr and return back up. What’s the fault Kevin? Not much went wrong with these & easy to work on. Old school lift!
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50VA transformer has burnt out, could just be an age thing.
Just be handy not to have to chase wiring around working it out if possible as the control box and motor are only really accessible from outside, shaft (if you can call it that) has a trap door/lid out on the roof.
This weeks Weather forecast doesn’t really make me want to expose that lot any more than I need to. -
If transformer has burnt out check fuses are correct type in motor head and both trailers for abrasion and damage. Another fault i used to see was when the property carpets had been replaced and nails driven through landing push cabling. I would also check the bridge rectifier before going too deep into possible faults. it is easy to disconnect both Cinch plugs to pin point if fault is at motor head or carriage circuit. If it is found the fault is at the carriage, leave the motor head Cinch plugs connected and disconect behind the carriage panel, this should identify if the trailers are at fault.
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If i rememebr rightly, does this lift have two transformers? Think 1 was for the lighting and the other for the safety line back to the contactors.
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It may have had multiple transformers originally, the failed one looks like it has possibly been replaced already. It’s a center tapped 25v-0-25v secondary, so that could be running as 0-25-50v
I have not looked at the rest of the controls vey closely and I don’t recall seeing a Bridge rectifier in there or a lighting circuit either.
I’ll look a little closer when I return – I’ll take a couple of sizable rectifiers with me just in case. -
Think that will be the main control, think the safety line voltage was at 48V the light and door solenoid at 12V
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Could verify control voltage ny looking at contactor coil voltage
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