How I Repaired a Non Running Mobility Scooter
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- čas přidán 17. 10. 2019
- I was contacted by a friend to say a friend of theirs had a mobility scooter that was no longer working & asked if I could have a look at it. After asking the usual questions (did it just stop or was it gradual, how old are the batteries, are you sure the batteries are properly & fully charged, etc) I started to investigate.
After a few checks & tests, I discovered the issue, however, replacing the affected part didn't solve the issue (mainly because I bought the incorrect part (DO'H)) so, then I had to get creative...
Music: Ethan Meixsell - Angel of Mercy
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That's awesome you just made this nice ladys day
I recently just sold a scooter like that that I got for 125 and the person who sold it to me said that it needed a new motor or cylinder or something like that and I looked at the fog code and it said that the motor was not working so I tested it out with a new motor and it turns out that the controller was completely shot so wired in my own from Amazon that wasn’t a mobility scooter controller and it worked good for a good while but the only problem was that whenever you used the electronica breaking it was either all or nothing so when my grandpa asked if he could use it while he visited I told him I really didn’t feel comfortable with him using it as it wasn’t something that he would be used to but I went ahead and let him use it anyway and I told him that you cannot get off of it until you turn it off otherwise it could take off on you because it doesn’t have the automatic return to zero on the potentiometer ensure enough he got off of it while it was still moving and it took off on him and he tried to catch it and it cut his leg open but after that he learned how to drive it very well but after he left I just didn’t really drive it all that much because it was just so much harder to use than what I would’ve liked but I was not about to spend $500 on a new controller when I could get another mobility scooter or power chair for less than that. It’s amazing how you can fix some thing to work that is not original and still have it be useful I would still have kept my scooter if it wasn’t so hard to drive on our bumpy road But with my power chair that I recently got I’m able to go pretty much everywhere that that scooter was able to go and I don’t have to worry about it taking off on me or throwing me off every time I hit the brakes.
I love your way of getting to fix the problem . I like also the other coments. I learned a lot - just go on all oof you:-)
I have a very logical & mechanical mind, if I see a problem, my mind will find a way to solve it; as I always say, "there are no problems, only solutions you haven't discovered yet"...
Thanks for watching...
good job, I have a scooter that stops randomly and refuses to start and I guess it's the accelerator potentiometer and I'm thinking of doing the same thing as you. the reason why it does not go without the wires being connected to the potentiometer is the following: the white wire in the center is a comparison wire between it and the other two yellow and orange wires. when the potentiometer is in the neutral position, there is 2.5k resistance between the white wire and the other two wires when you twist the potentiometer in a direction the resistance decreases on the wire from that side and increases on the wire on the opposite side and the motor controller determines in which direction the motor shut rotate depending on which of the two wires has lower resistance. when you have disconnected the wires from the potentiometer and try to make a short between the white and yellow wires the motor controller sees 0 ohms resistance between the white and yellow wires but open circuit between white and orange so it has no comparison term. when you reconnected the wires to the potentiometer and made the shield between the white and the yellow wires, the motor controller saw 0 ohms between white and orange and 2.5 k between white and yellow which could be compared. One way you can do the same thing without using the potentiometer is to take two 2.5k resistors and connect them both to the white wire and each to one of the other two wires or just put a resistor between the contacts of each switch.
Best wishes,
Andy
Hey Andy, welcome to my channel. Thanks for the explanation, that makes perfect sense; not only does it help me but, hopefully, it will help others too...
yuo are right ,better explained,impossible
Its because of the controllers used to drive mobility scooters. They use pulse width modulation to control DC motor, thus the circuit uses resistance between Vcc power source and two voltage level inputs. Depending on how the potentiometer is rotated it splits the resistance between the two inputs which changes the voltage. The two inputs need to see two levels of voltage that will always add up to the source. This way the controller knows exactly how fast to accelerate the motor and in what direction. You’re way of thinking wasnt crazy tho... it would have worked if there was no PWD controller and the motor was simply driven by a single source voltage off the battery that flips polarity depending on desired direction.
Thanks for the explanations. Is Vcc in this context the full 24V which is split between the two wires going to the motor controller? did I get that right? thanks
👍
I john in ukthe model y0u are working on you did a good job i want the wiring diragram,for inside the till head ,and what model is that shoprider if you can help me thanks
Unfortunately. I can't help on either issue... Sorry...
Great video very informative. Just a couple of observations I have , what would happen if both buttons a pushed at the same time? And it might be a good idea to put heat shrink tubing on rhe connections at the potentiometer to prevent a short between two cables causing the scooter to go out of control
Great question. To be honest, off the top of my head, I have no idea because I don't recall testing that scenario. I would assume one of three things would happen:
1. Nothing because the signals would cancel each other out
2. The controller would have a built in over ride so the scooter would go forward or
3. The controller would fry itself.
As for wrapping the terminals, you are absolutely correct, I SHOULD have, even though there's very little chance the terminals will move & make contact...
hey love the videos, where did you get the potentiometer from ?
Thanks for watching...
I typed the number on the bottom of the pot into google. I think I ended up finding mine on ali express but, as the video shows, I bought the wrong one. A genuine replacement is around AUD$30...
You can get in any electronic spare parts must be lineal mark B after the value,,,A meaning logarithmic
Love the video. Only thing is maybe variable speed triggers? Is that pretty much a potentiometer? Lol I don't know when it comes to potentiometers, relays, circuits etc. I have a mobility scooter I'm fixing at the moment that I found in hard rubbish. Batteries are good, needed wheels. Lights work but forward n back are temperamental.
Yeah, a potentiometer is, in this scenario, pretty much, a variable speed adjuster, it limits the amount of power so, the more you turn it, the more power you have. A simple example of a potentiometer is a volume knob on any sound equipment...
Thanks for watching & good luck with your project...
Any ideas why my mobility scooter won't move lights and that come on i did need to do the wiring myself to get lights horn to work just won't move tho
As I've previously stated, my only experience with these is what you see in this video so, unfortunately, I can't help...
Wish you lived close by to fix my scooter
i just bought a galaxy excel4 ..very nice scooter..works great when on full speed but when trying to go slow like to reverse it into the house it's like it's seized up the steering is so hard to move any ideas plssssssssssssss
Just to clarify, are you asking for help with the steering or the speed of the scooter in reverse?
Also, I'm no expert with these, I was simply fortunate enough to figure out & solve this particular issue ...
@@PopllFixit was just wondering if any of ur followers had any idea why the steering is so stiff lol...no worries if i can't sort it i'll get rid and get another...tnx tho...love ur post
Unfortunately, the issue could lie at any point. My first suggestion would be to check every joint...
Without knowing the particular machine, I'm afraid I can't be any more helpful...
How pop, I like it, good to watch you, can you tell me how to take the control head of the top of the handlebars,.Plz as I need to replace the speed controller. 🤔😊
IF you are referring to the speed control knob I refer to from 1-2 minutes in the video, it should simply lift off... with a little persuasion from a flat screwdriver or thin chisel...
However, that's on this particular model; on some, there may be a small grub screw (set screw) with either a flat screw head or an allen head...
If this is NOT what you're referring to, let me know with a little more detail & I'll do my best to help you...
Thanks for watching...
What about the very able speed control ??
If I recall correctly, it wasn't affected...
Mine was running great with new batteries. I let it sit for a few months with key in ignition not it won't start batteries are fully charged. Help please...
electric brake is stuck on.. google mobility scooter electric brake seized .. i fixed mine by taking it off 3 screws and replacing it with a second hand one from ebay...
Hey, thanks for jumping in there...
my scooter stops moving forward after a short time but will move backwards what is the problem.
As I've previously mentioned, I don't know a lot about these, I took on this job because I knew where the issue was & how to "fix" it because it was in front of me. Unfortunately, this means that I can't answer your question but, I'm hoping a viewer may see this & chime in with an answer for you...
Thanks for watching & I'm sorry I can't be of any help...
Not wok with potenciometer disconnected because is no voltage presented to activate the motor driver
We've established that but, thanks for the comment & thanks for watching
Controller is looking for resistance
My nans scooter is broke an wont gi thanks alot I will show her the video thanks
Thanks for watching.
That's why I make these videos, there's always someone with the same issue...
Keep in mind, this may not be the solution, this is just one of many possible issues...
Can't for the life of me understand why you didn't just buy a replacement potentiometer off ebay for less than £2 (GBP) , You didn't need to buy one from the scooter maker because they add 1000% mark up. Potentiometers invariably have their type printed on them eg 100k type b so it's easy to get a cheap replacement. The potentiometer carries virtually no current as it is connected to a programmed controller mounted near the motor. A potentiometer is used on what is called the wig wag arm to give a soft start rather than full power immediately which is what the switches you used will do. When I was doing one up I too thought it would use a simple PWM controller of the type used on electric bikes, but scooters are much more sophisticated, For example if the electromagnetic brake fails to automatically come off when you start to move (a common fault on scooters) the controller detects this and automatically stops power to the motor and the fault light flashes a set number of flashes to tell you the problem. Without this logic the brake and motor would overheat and burn out, possibly in flames!
I did look but, couldn't find an exact match
Umm NO. All you needed to do was adjust the throttle housing to work in sequence with the potentiometer.
Thanks for the input... although I have no idea what that means so it wouldn't have helped me when I made this video...
Is it earth that you lack without the potentiometer ? sry years later lol
That's ok, this is still one of my most viewed videos; thanks for watching...
I believe your question was answered by WrenchBoostBoi89:
"Its because of the controllers used to drive mobility scooters. They use pulse width modulation to control DC motor, thus the circuit uses resistance between Vcc power source and two voltage level inputs. Depending on how the potentiometer is rotated it splits the resistance between the two inputs which changes the voltage. The two inputs need to see two levels of voltage that will always add up to the source. This way the controller knows exactly how fast to accelerate the motor and in what direction."
Bro come fix my scooter please
Yeah, I wish lol...