Hall effect angle sensor reverse polarity

[cosmagedon]

I've got an issue with a angle sensor on a front suspension, strange enough it's working in the wrong direction compared the what the ECU is expecting to see for calibration.

The sensor can't be fitted any other way than it currently is and the arm can't be turned around so my only thought is the polarity must be wrong. I've tried googling it but I'm not getting any clear answer, can a hall effect angle sensor +v and -v be switched around or will it damage the sensor? I haven't got a spare one to test that I don't want to break

 

[Fraserb]

I've got an issue with a angle sensor on a front suspension, strange enough it's working in the wrong direction compared the what the ECU is expecting to see for calibration.

The sensor can't be fitted any other way than it currently is and the arm can't be turned around so my only thought is the polarity must be wrong. I've tried googling it but I'm not getting any clear answer, can a hall effect angle sensor +v and -v be switched around or will it damage the sensor? I haven't got a spare one to test that I don't want to break

We use hall effect sensors on the parlour, ours just don't work if you swap the polarity.

 

[Wombat]

hall effect normally needs a definied postive and negative and won;t work if connected the other way round

 

[e3120]

Are you sure it's Hall effect? If it's just a boggo potentiometer, swapping the outer wires would give your symptoms and can be reversed.

 

[davidroberts30]

You sure its not 180 degrees out

 

[cosmagedon]

Manual says it's a hall effect and the signal I was expecting must have been a typo, I swapped the wires and tried to calibrate it but got an error saying axle moving in the wrong direction. So it is working right just out of the parameters.

Put the wires back and I noticed a slight twist in the arm. Once I'd straighten that it calibrated ok. I don't understand why adjusting the rod didn't make a difference as it moved more than the twist but I'm not complaining it's working now.

Thanks for the replies

 

[aidan]

We use hall effect sensors on the parlour, ours just don't work if you swap the polarity.

what you do with them on the milking parlour if you dont mind me asking

 

[DrDunc]

Manual says it's a hall effect and the signal I was expecting must have been a typo, I swapped the wires and tried to calibrate it but got an error saying axle moving in the wrong direction. So it is working right just out of the parameters.

Put the wires back and I noticed a slight twist in the arm. Once I'd straighten that it calibrated ok. I don't understand why adjusting the rod didn't make a difference as it moved more than the twist but I'm not complaining it's working now.

Thanks for the replies

What variety of tractor?

Hall effect angle sensors are a fairly new concept. The biggest advantage is no moving parts, so shouldn't wear out like a potentiometer..... So no highly inflated parts department replacement prices!

 

[Fraserb]

what you do with them on the milking parlour if you dont mind me asking

They are on the safety gates as cows come in to stop parlour if cow isn't in properly, also on wash pipe so parlour won't move if still connected. There's another controls the teat sprayer as well.

 

[Timbo]

Hall effect are usually 5v pwm output. Power polarity wont change that.

 

[cosmagedon]

What variety of tractor?

Hall effect angle sensors are a fairly new concept. The biggest advantage is no moving parts, so shouldn't wear out like a potentiometer..... So no highly inflated parts department replacement prices!

It's a New Holland, 2017, funny enough it mentions the no moving parts in the manual when talking about the sensor.

Hall effect are usually 5v pwm output. Power polarity wont change that.

Once I'd swapped the polarity I didn't get much chance to try anything as it knew it was moving in the wrong direction.

 

[Combine Rescue]

Hall sensor will not work if you swap polarity. This is not a potentiometer.
If you reading goes wrong way it's mean you fitted wrong war round or you rave wrong sensor. Or if there was potentiometer sensor before and this is new replacement than it may be need software configuration/setup or upgrade firmware

 

[cosmagedon]

Hall sensor will not work if you swap polarity. This is not a potentiometer.
If you reading goes wrong way it's mean you fitted wrong war round or you rave wrong sensor. Or if there was potentiometer sensor before and this is new replacement than it may be need software configuration/setup or upgrade firmware

I'm only going off the manual, It's all working now so it was just me over complicating the issue.

Out of interest how can I tell a hall effect sensor from a old fashioned pot?

 

[Combine Rescue]

I'm only going off the manual, It's all working now so it was just me over complicating the issue.

Out of interest how can I tell a hall effect sensor from a old fashioned pot?

Hall effect sensor is based on magnet wave on top off hall transistor, potentiometer is a metal brush traveling on resistive path. Hall effect sensor should work longer as they have no physical contact between magnet and hall transistor.
In practise the goes wrong as well but they cost more.

 

[Farmer_Joe]

Cool video that, I like his ‘ bread board’

 

[Combine Rescue]

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Combine Rescue Electric , Daventry, Northamptonshire. 1,191 likes · 33 talking about this. Electric and electronics repairs on combine harvesters +

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[335d]

What variety of tractor?

Hall effect angle sensors are a fairly new concept. The biggest advantage is no moving parts, so shouldn't wear out like a potentiometer..... So no highly inflated parts department replacement prices!

Sorry to be pedantic, but I wouldn’t call a technology patented in the 90’s a “fairly” new concept. Their widespread use in the automotive world however, has really only been in the last 10 years. Probably due to the cost, and the fact that honeywells patent expired in 2011.

 

[DrDunc]

Sorry to be pedantic, but I wouldn’t call a technology patented in the 90’s a “fairly” new concept. Their widespread use in the automotive world however, has really only been in the last 10 years. Probably due to the cost, and the fact that honeywells patent expired in 2011.

I can't fault you for the public display of superior knowledge, regardless of the reasons for which you deem it necessary