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Acorn stairlift battery not charging
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My Mum has an older Acorn stair lift, there is no “readout” display only 3 lights and a “key” switch. The batteries and charging circuit are all good. There are 3 fuses that are all good a “spade” type at 25A in the battery lead, another “spade” 25A I think in the motor drive circuit ( I think waiting for the o/p from a “drive” reay) and a “cartridge” fuse. There is 24v on both sides of the small cartridge fuse. I think all of the “gate”/stop/start type switches are ok but turning on the key/lock switch and operating the up/down key there is no response or visual indication that anything is happenning. There are 2 switches on the lower tray to stop the lift at the bottom of the stairs and there are another 2 to stop the lift at the top of the stair. There are also some in the foot rest, which I think will engage if the foot rest makes contact with something. We have no operators leaflet. Anyone out there who may help with this one?
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Which if any of the three lights are lit?
You should have a red light with key off and green with key on
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It’s very common to find dry joints on the armrest pcb this can cause the lift to stop.
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The red plug switch on the carriage. When you take that out and put it bag in again. Do you get a beep? Also. Do you still have the remotes with the lift? Lastly. Have you ever taken the chair off the lift?
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Thanks Paul,Kevin. northern mobility. When the “red” isolating plug is instered and the “key” swich turned, there are no lights. Switching the toggle switch has no effect. There is no “bleep”. We still have remotes. The chair has been of the lift to change the batteries and check the charger on the charging contacts and off the charging contacts. Charging currect about 100mA rises to 31v ish and then cuts back to about 29v over a few minutes as I would expect. Dry joints on the arm pcb havent looked at that. Also looking for other “gate” switches. No makers number other than Acorn. 24v gets as far as the cartridge fuse
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Check for voltage at the red isolator plug, check for continuity on the isolator and key switch
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Check the wiring loom running in the arm. They have a tendency to brake or short to the frame.
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Thanks for those 2 options. I think by charging and fuse inspection the “red” isolator is fine as I can read 24v on the pcb cartridge fuse but continuity of the “key” switch and the wiring loom/plugs/socket are worth looking at.
Any body got a circuit diagram of such a lift? Thanks again, may take me a while to check that out at Mums. -
Ok Sorry for the delay.
I have tested​ from the arm key/switch and leds back to the plug on the main pcb and all give good low resistance readings and switch functions by resistance readings. The up/down switch had a dry joint. Re assembled and still there is no indication that its even powering up, ie no leds on and no other functions.
Any other options?​
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