Author Topic: Problem at start  (Read 5312 times)

Offline rfjeldheim

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Problem at start
« on: August 22, 2010, 11:43:42 PM »
hi
I was hesitant to post on this topic because the last time I  installed a 1000w kit and had a problem at startup it turned out to be that the throttle kill switch was engaged. I went a week thinking the motor was bad. Duh. But being somewhat electronically challenged and just having completed my secound build here goes.. I have just completed installing a 48v Magic Pie kit with internal controller. Using a 48v GM battery. everything went together well but when I connected the battery and hit the throttle all I got was a slight response from the motor, not even a complete revolution. Rechecked the power connections and the hall sensor plug and everything checks out. I am also getting an odd resistance from the motor that could be described as magnetic resistance as the coils pass by the magnets. feels like a shudder. My 1000w motor has some resistance but it is smooth when I roll it with the power turned off . Can anyone help me troubleshoot this problem? thanks

Offline Bikemad

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Re: Problem at start
« Reply #1 on: August 23, 2010, 02:06:11 AM »
I have just completed installing a 48v Magic Pie kit with internal controller.
Rechecked the power connections and the hall sensor plug and everything checks out.

I'm slightly puzzled by your comment, as the internal controller does not have a hall sensor plug, the wires are soldered directly onto the controller circuit board.

You should be able to check if the motor and controller are both working correctly by doing a simple test with the main harness disconnected.
A small piece of wire (a reshaped non plastic coated paper clip works well for this) inserted between pins no 4 and 6 on the motor socket should make the motor run at full speed:



Make sure the wheel is raised off the ground and that the power is switched ON before you insert the wire.
Be very careful to only put it into the correct holes or you could damage the controller or wiring. ???

If the motor spins correctly, this will indicate that the battery, speed controller and the throttle wiring in the motor harness are all working correctly. Therefore the fault must be somewhere in the main harness, throttle or brake switches (or one of the connectors).

If the motor does not spin when 4 and 6 are linked, and the wheel is "lumpy" and difficult to turn with the power off, it sounds like the controller may have failed.

Do you get any beeps from the controller?

Alan
 


Offline rfjeldheim

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Re: Problem at start
« Reply #2 on: August 24, 2010, 01:30:32 AM »
Thanks for your suggestion Alan... The connector you pictured was the one I referred to as the hall sensor plug. I will try your test tommorrow evening after work.. The description you used of the wheel being lumpy is accurate as well. I will post the results of the test tomorrow night.
Richard

Offline rfjeldheim

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Re: Problem at start
« Reply #3 on: August 24, 2010, 10:07:04 PM »
Hi Alan just ran the test you suggested ...Thanks again... Got the same results from the motor...started to rotate forward about 1/16 inch and thats all.... wheel is definitly acting "lumpy"....What do you think ? return for a replacement?...
On a secound issue... I have a new 3 amp charger (also GM} that just quit. I bought two a couple of months ago and switched out the power cords and fuses and no change... just doesn't work...sooo I have also got a older 2amp but it has a different charging plug and I would like to pull the plug off the broken one and install it on the older one... Is there an easy way to check the positive and negative comming out of the charger?... Thanks for all your help...
Richard

Offline Bikemad

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Re: Faulty controller
« Reply #4 on: August 24, 2010, 11:21:59 PM »
What do you think ? return for a replacement?...

Richard,

Assuming your battery is OK, you have two options, dependant upon where you actually purchased the kit. If you bought it from a local dealer, contact them and see what their procedure is.
If you bought it direct from GM in China, you will need to contact Tom (zhourenli@goldenmotor.com) and briefly explain the problem to him.
If he agrees that your controller is faulty, I expect he will simply send you a replacement controller, as sending a complete wheel back for repair will be very expensive and time consuming.

Is there an easy way to check the positive and negative comming out of the charger?...

Most digital voltmeters will give some indication as to whether the polarity is correct or reversed. If you connect the red meter lead to whichever charger lead you think is positive and then connect the black lead to the other, the meter should give a normal voltage reading if it is correct, or most likely a negative reading if it is reversed (eg. -56.00).

You can also do the same with the battery charge socket to determine the correct polarity if you're in any doubt.

Alan
 

Offline rfjeldheim

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Re: Problem at start
« Reply #5 on: August 25, 2010, 09:34:05 PM »
Thanks for all your help Alan .I did get the motor from a dealer. Gary at goldenmotor.ca has been great to work with and Iv'e already contacted him. We should be paying you for all your help. If I can return the favor sometime I will be happy to. I'm pretty good with the mechanical stuff and fabrication. I also have a machine shop at my disposal. do you have an email address?
Thanks again Richard