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Left Brake fault

I'm helping a Veteran that the VA administration has left hanging. He has an InvaCare power chair TDXSP. The controller is showing a "left brake fault". I unplugged both motors from the power control box on the bottom back of the chair and reversed them. Then it said I had a "right brake fault" when I powered it up. I see a couple of solutions here about replacing the left motor assembly under this same question. Would this still be a solution for this problem or is it the motor control box that they are plugged into need to be replaced?

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  • Strat McCloskey Jan 22, 2013

    Pardon the earlier incomplete post. I didn't realize you shouldn't hit ENTER when posting on this website. Here's the complete post...I couldn't identify any brake cable going to the motors from that controller mounted on the bottom of the rear of the chair. Each connector has 2 heavy wires to one of the motors and 2 thin wires that go to a switch in the rear of the motor that tells the machine whether or not the motor it is in the drive or push (free wheel) mode. When you switch the motor cables on that controller you get a motor fault that follows that particular motor cable. When you set the motor levers to push (free wheel) you get left brake fault. When you set levers to drive you get a right motor fault. Hope this makes some sort of sense. Strat



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  • Invacare Master
  • 1,263 Answers

Hi, Please check the lead and the fitting to the controller, it 's rare for the controller to have this problem, I have repaired that very fault recently and it was a high resistance cable fault , now measure the brake cable from the controller , disconnect cable and put the electrical meter on the lowest ohms reading, now it should read from 0.4 to 1.0 ohms any more and that's what causing the problem.

Posted on Jan 20, 2013

  • 8 more comments 
  • Strat McCloskey Jan 20, 2013

    I will try that tomorrow and post the result. Thanx.

  • Strat McCloskey Jan 21, 2013

    I couldn't identify any brake cable going to the motors from that controller mounted on the rear bottom of the

  • Robin Hill
    Robin Hill Jan 22, 2013

    okay it normally combined with the motor output from the controller, there should be four connectors within the one connector , two for the brake and two for the motor

  • Strat McCloskey Jan 23, 2013

    I don't know if you had read the whole post concerning the cables. Here's some additional observations that were made yesterday. When the chair was turned on the display read that the chair was ready to go (not those exact words). When the joystick was moved the errors then showed up. eg: right motor fault. Hope this might shed some light on where the problem is.

  • Robin Hill
    Robin Hill Jan 23, 2013

    hi, once you move the joystick the controller will then test the brake before powering , now as i explained earlier you need to make sure the resistance is correct otherwise it will never work . regards

  • Strat McCloskey Jan 24, 2013

    Hi, This is where I'm getting confused with the terminology. I don't see any type of "brakes" on the motor. I'm looking for some sort of a coil that would energize a braking mechanism and assume it's electronically braked through the controller. I removed the rear plate on one of the motors to see where the 2 smaller wires went after entering the motor and all that there is is a small switch mounted to detect whether or not the lever on the outside of the motor is in the up or down position. Indicating if the motors are engaged with the wheels or not (are you calling the action of these levers the brakes?). Is it this switch you believe is malfunctioning? I did check the resistance across the leads at the connector end and they didn't seem outta bounds. I will take another look based on your advice.

  • Robin Hill
    Robin Hill Jan 24, 2013

    Strat, I 'm going to have more detailed look and supply pictures shortly.. regards

  • Strat McCloskey Jan 24, 2013

    Looking forward to that. Thanx

  • Strat McCloskey Jan 24, 2013

    I have 3 pictures you can look at. You can just make out the 4 wires in the one that go into the controller(also pictured). you can see the motors and the rear 4 screws on them that when removed along with that plate show that switch behind there. That I don't have pictured though. Also a picture of most of the chair.

  • Robin Hill
    Robin Hill Jan 25, 2013

    hi, see the yellow strings to the left and right of those pictures are the motors, now you see three screws, they are the electro mechanical brakes fitted on top of the motor ? The wires going into this part need to be tested regards



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