MemberAugust 11, 2016 at 2:16 pm
I have a Bison/Acorn 80 with flashing E on display, does not reset, brake connector looks ok, Any help appreciated.
MemberAugust 11, 2016 at 3:50 pm
Motor brake failure
MemberAugust 12, 2016 at 8:34 pm
Thanks, I checked for dc power from the pcb connector to the brake but no voltage present. Are there schematics/circuit diagrams available for the PCBs?
MemberAugust 15, 2016 at 10:03 am
Presumably the brake releases with 24v applied?
MemberAugust 15, 2016 at 3:35 pm
You won’t have any voltage to the brake until a call is put in, since your lift is in fault then this isn’t going to happen.
Yes it’s a 24v dc brake
Are you sure the batteries are ok?
MemberAugust 16, 2016 at 4:33 pm
Thanks for info, yes batteries have approx. 28v at the charge point. I was resetting the datum when the fault occurred, switching on and off will not clear the fault, I will recheck the batteries off charge but I’m fairly sure they are ok. (2 mths old – but did get discharged, hence resetting the datum).
How do you clear a fault? Or is the pcb/processor passing a small current through the brake coil and detecting an open circuit?
MemberAugust 16, 2016 at 6:10 pm
Flashing “E” indicates an installation error . Brake fault is an static E when a call is put in. Its sounds like an installation error. Check the board dips are in the correct position when your setting the datum I.E. the lift handing dip make sure its set to left or right to match the lift.
MemberAugust 17, 2016 at 11:04 amquote Marlpitlane:
Then most likely as suggested you have knocked the dip switch for the hand of the lift, it is right at the side of the program dip switch
MemberAugust 19, 2016 at 8:26 pm
Well done ianb, and northern mobility you were correct. Dainty hands here managed to knock the ‘hand’ switch to the off position probably when removing/replacing/checking the battery cables.
In my defence, if I didn’t have to charge the batteries with an external supply to get the thing to ‘boot up’ and charge itself, then it would never have happened.
Waiting for the next holiday (flat batteries again) , but I will take more care next time.
MemberAugust 25, 2016 at 3:38 pm
I think I may have a similar fat finger type problem that Marlpitlane suffered from but first some context.
I had a local company install a “reconditioned” Acorn 80 for my mum just over a year ago which has been mainly unused. A couple of weeks ago her carer tried to use it but it was dead so they called a service number which they found on a label on the stair lift. The “engineer” diagnosed the problem to be a faulty battery pack which he would be happy to replace for Â£275. Luckily they then called me for advice. Having been an electromechanical/electronic engineer most of my working life, I thanked the “engineer” and sent him on his way before heading to Google.
After some research I came across this helpful forum and discovered that if the batteries were totally flat the recharging circuitry wonâ€™t initialise when the power supply is turned on â€“ what a wonderful design!
I used my motorcycle trickle charger to get some life back into the batteries before re-installing them and am now waiting for them to fully charge before resetting the datum.
While waiting I have noticed a couple of things.
The Hinge Zone switch and red LED is on. Is it supposed to be on in normal working conditions or could I have knocked the switch while removing the batteries?
The 33V 1.5A power supply seems to be a replacement. Although it supplies 33V under no load, when the batteries are in fast charge mode it seems to fluctuate between 14V and 20V. This doesnâ€™t seem right and may point to a failing power supply.
MemberAugust 26, 2016 at 1:59 pm
1. The Acorn 80 batteries will charge from zero volts, no need to take off the batteries and charge elsewhere, you just need to get the lift on a charge point.
2. Has the lift got a hinged track? If it has the dip switch would be on, if not turn it off
Reset the datum when you have enough power and it should be fine
MemberAugust 28, 2016 at 5:25 pm
Hi I have bought a second hand Acorn 80 that goes up 3 steps then changes level and goes around the corner and changes level again up to the top of the stairs. I have taken the batteries out and trickle charged them, put them back and the chair moved but did not display any signs that are in the hand book. i ran it up to the first level change and it stopped, now its flashing E. Ive wound it down to the charge point as described. Its just flashing E. and I have no idea what to do. Can anyone hlp please?
MemberAugust 28, 2016 at 5:52 pm
You will need to have it reprogrammed and that’s a job for trained personel in my view what location is the lift in
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