Question about Power Health Scooter Wheelchair Programmer Ds100 Dynamic Rhino Power

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After about 1 km on any power setting the scooter slows down on its own then surges up to power again. it gets a small back emf and this seems to help but is persistent some tiime down to 2 km/h checked the variable resistors and they seem ok only persistant thing is the reverse is always a bit slower than usual even when fresh. checked the main connections to the motor/controller and no heating of the connections. any clues thanks

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  • kayedgecumbe Dec 30, 2010

    thanks it would seem more like brush gear so will check out from that angle
    as well i think the reverse resistor may be also need checking, thanks
    batteries are good as thee scooter always picks up after a few meters
    thanks for the info
    LOL just remembered i had the same symtoms years ago and it was the brushes then

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Based on your description of the symptoms, I would load test the batteries, check the throttle potentiometer, speed potentiometer , motor brushes and motor brake. I cannot determine your specific model based on the way the problem was posted, so it is difficult to give specific advice.
Weak or old batteries will give the performance you are describing. Fully charge the batteries and load test them to determine their strength. Batteries more than 1.5 years old are suspect. Without a load tester you can do a load test by connecting your digital voltmeter to the batteries and run the scooter under load (driving it with weight on it). If the voltage drops more than 1.5 volts from a starting voltage of between 24 and 27 volts the batteries are weak.
Generally speaking, you can do a resistance check of the potentiometers throughout the range using a digital voltmeter. The specification for the potentiometers is stamped on the case. If there are dead spots when you turn the potentiometer based on a drop at the voltmeter then your problem is with one or both of the potentiometers. I usually replace both since they are usually wired in series.
Worn or bad brushes, worn motor armature, accumulation of brush dust, or a dragging brake can also cause the symptoms you describe. Pull and inspect the motor brushes for wear or burning. Blow out the motor with compressed air with the brushes removed and inspect the brake for discoloration or dragging. Do a resistance check on the brake. It should read between 30 to 60 ohms. The motor coil should read between 0 to 1.6 ohms.
Hope this helps.

Posted on Dec 30, 2010

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