I have had an electric mountain bike for a couple of years now and it has never let me down until the other evening.

 

When I came to use it, after fully recharging, I switched on the key, the LED lights on the indicator flickered and that was it....no power whatsoever! I checked the battery yesterday with a voltmeter and the output indicated about 40/42 volts, so it appears the battery is not at fault?

 

I have visually checked the wiring and there are no obvious faults or short circuits so can only assume at this stage that the fault may be the controller box? Has anyone had a similar problem and may know how, and where to begin to sort out this problem?

 

I have now removed the battery to help reduce the overall weight but it is still very difficult to pedal without this.

 

I do not know the manufacturer of the bike as this was purchased through a well known auction site, and there are no identification marks on it. I believe it was made in China and is very similar to a Whisper. The original battery was situated down behind the saddle upright stem, but because I couldn't get an original replacement I fitted what I understand to be an Alien battery on the rear rack.

 

Any further help or advice would be greatly appreciated!!

Do you have a battery level meter on the handlebars? If so, are the LEDs lit, and if so, when you twist the throttle, do they go out?

Yes I do have a battery level meter on the handlebars which comprises of 5 or 6 small LED's. Initially they flickered, but now I don't have any lights whatsoever and nothing when I operate the throttle?

 

I have just removed the cover from the controller unit, but have left it wired for the time being until I know more.

Hi It sounds like the battery connector is it bent or burnt or could be a fuse in the battery

 

it may read 42 volts is that on the output to the controller

 

Frank

Can you post a photo of your bike and the controller?

 

It may help if we can identify what model it is.

 

Steve

Hi. I have just checked the fuse and no problem. The voltage from the battery is both at the output socket and at the wiring within the controller unit.

Hi. I am unable to supply a photo but have the details from the controller unit as follows:

 

Intelligent Motor Controller

Voltage: 36 V

Embedded Voltage: 31.5 V

Model: YK79B 1.1 (Not sure if this is 7 as label is damaged)

Angle: 120

Power: 250 W

Brake Level: Low

Production Date: 2008-8

You may like to check if you have a second fuse that protects the BMS - a smaller fuse that may have worked loose... Some pictures would certainly help if you can get hold of a camera.

Hi. Here is a couple of photo's that may help?

 

[ATTACH]3346.vB[/ATTACH] [ATTACH]3347.vB[/ATTACH] [ATTACH]3348.vB[/ATTACH] [ATTACH]3349.vB[/ATTACH]

Edited March 27, 201214 yr by chris301up

If the LED's filkered and the battery reads 42v then there's a good chance there is a connection issue.

 

There isn't much to fail in controllers and electric circuits that are run at the standard required wattage.

The chances are there is something a drift in the connectors. Whether this be a throttle connector, an on switch etc...

 

As your bike has a pretty rusty chain I can only assume you ride in all weathers. This means the connectors if not fully waterproof will be rusting over time.

 

You'll probably need a multimeter to test the various connectors to find your problem.

A picture of the handlebar controls would give a complete idea of your bikes setup.

Hi Connect you meter on the heavy red and black on the controller see if you have 42 volts if so try the motor if the voltage drops then it is ether battery or connectors

 

Frank

Hi. I don't normally ride out in bad weather as I tend to be a 'Fair Weather Rider' only. The chain is actually gold in colour by manufacture and I use copper lubricant which tends to give the impression of rust! But that's a minor issue for the moment.

 

Thanks for your advice. I am going to try to borrow a multimeter later today and go through the various connections once again - but I won't hold my breath? Maybe I will be lucky!

Thanks for the handlebar pics.

While you are waiting for the multimeter, could you trace are the cables going back to the controller from the throttle, display, brake lever switches and pedelec sensor and post a list of the number of wires, wire colours and a description of the connector they are terminated into.

Right. We have checked out the controller with a multimeter and there is 40/42 volts at the battery output and at the controller. There is no power whatsoever from any of the other outputs from the controller.

I have now removed the controller unit which smells very slightly of burning, but that could just be the natural smell from usage?

 

The wires (as far as I can determine) are as follows:

 

1 x Orange (Positive from battery)

1 x Black (Negative in from battery)

2 x Grey (Not connected to anything)

1 x Thick Green (To motor)

1 x Thick Blue (To motor)

1 x Thick Yellow (To motor)

 

The following I am not sure where they go as I cannot trace them:

 

5 pin connector with Red-Black-Yellow-Blue-Green

3 pin connector with Red-Black-Red & Green

3 pin connector with Red-Black-Red & Blue

1 x Orange wire

1 x Black wire

 

I am reasonably sure this is where the fault may lie so does anyone know where I can obtain a replacement?

Does it look like this one?

 

Intelligent Motor controller,electric vehicle control 24v180w, 36v250w, 48v350w(HD-CY01),EPAC/EN15195 products, buy Intelligent Motor controller,electric vehicle control 24v180w, 36v250w, 48v350w(HD-CY01),EPAC/EN15195 products from alibaba.com

Edited March 27, 201214 yr by shemozzle999

It certainly looks like that one but cannot identify the wires from that picture?

It is sold by Golden Motors, I think they have an American outlet that accept Paypal I will have a look for a link.

 

Email them the Model No.

 

http://www.goldenmotor.com/

Edited March 27, 201214 yr by shemozzle999

Hi This looks the Job £25.50

 

36V 250W E - bike & scooter brushless motor controller | eBay

 

 

Frank

Thanks Frank. Have just checked it out on Ebay and it looks like the one? I think I would have to sort out a re-wire though?

I think this is your exact controller I can just make out the model no. using this link which shows a larger picture if you click the enlarge button:

 

Intelligent Motor controller,electric vehicle control 24v180w, 36v250w, 48v350w(HD-CY01),EPAC/EN15195 - Detailed info for Intelligent Motor controller,electric vehicle control 24v180w, 36v250w, 48v350w(HD-CY01),EPAC/EN15195,intelligent controller,Int

Edited March 28, 201214 yr by shemozzle999

Yes. It could be? But my model number is - YK79B. Will email them later to check it out. Thanks

Have removed my controller and here is a photo for reference:

 

[ATTACH]3358.vB[/ATTACH]

 

This should help!!

Personally I would take a punt at it.

The similarities, same case extrusion, end plates held on by 6 screws, same typeface used for "Intelligent Motor Controller", 2 bundles of wires sealed with hot glue and I can make out "YK" on the Golden Motor photo if you enlarge it and push the browser resolution up to 300%.

Their controller model range is CY-01, CY-02 .....

I think yours is YK1 which would correspond to CY-01.

 

I would ask them if they could provide a datasheet and 1 off sample unit 36v,250w and give you a price delivered to the UK and whether they would accept payment by Paypal.

Thanks. Have emailed them as you suggested and will see what happens???