Testing Hall sensors

[Beavinator]

I should of tested my hall sensors before I took apart my 5304 but i didn't. So I hiiled up a 9V battery to the red and black hall wires and tested for power at each of the 3 hall wires (yellow green blue) while moving a magnet over them. I never got any voltage at all from any of the 3 wires. Does this mean my halls are blown?

 

[nicobie]

If you had your motor apart when waving a magnet over the halls, I'd say yes, they are toast.

You can do the same thing when the motor is together by powering up the red and black wires, slowly spin the hub then check each of the sense wires to see if the voltage toggles off and on.

 

[fechter]

It's unlikely (but not impossible) that all 3 would blow. If all of them don't respond, I would suspect a broken red or black wire.
You could measure from the black to red wire with an ohmmeter and see that there is some kind of reading. If a wire broke, it will measure open.

 

[Beavinator]

when I put my ohmeter on the red and black wires it says .070

 

[Jeremy Harris]

This has been mentioned a few times before, but I'll repeat it again.

Hall sensors need a pull-up resistor from the output to the positive supply in order to give an output that can be measured with a meter. The chances are that your Halls are fine. To test them, connect resistors of around 2k2 between each Hall output and the positive supply, then repeat the test by spinning the wheel. The meter should show the Halls switching.

Alternatively, just connect the Halls to the controller, power up the controller (no throttle needed) and put a meter on each Hall output. The controller has internal pull-up resistors that will allow the Halls to switch correctly when it's powered up.

Jeremy

 

[BLUESTREAK]

Get LYEN'S hall tester for $30.00 and do it all with ease.

 

[Jeremy Harris]

As we've lost all the old attachments, it seems here are two easy to build Hall testers.

First off, here's an illustration of the meter test method, with a resistor and power supply of around 5 to 10V (a 9V battery works fine):

To use this method, switch the meter to read volts and either rotate the wheel or place a magnet against the Hall sensor (you will need to try the magnet both ways to get the polarity right). The meter should go high or low as the magnet poles are reversed against the sensor flat face.

Alternatively, you can make a very cheap and simple Hall tester using a resistor, small battery and an LED, like this:

The LED will light up or go out depending on the polarity of the magnet pole facing the sensor.

Jeremy

 

[fechter]

when I put my ohmeter on the red and black wires it says .070

OK, at least the power wires are not broken.

Some hall sensors have a built-in pull-up resistor and can be measured directly with a voltmeter. Some don't and would need something to pull them up (although I think you could put your voltmeter between the positive supply and output and still get a reading using the meter itself to pull up).

 

[davec]

3 x aaa batteries + multmeter and a 2k resistor worked for me
these guys use a LED i just used a multi-meter

 

[fechter]

Very nice!

The supply voltage rating for the SS41 is 4.5v to 24v, so you have some flexibility there.


You can also just use the LED and resistor part to test a motor attached to a controller.