First off i want to say thanks to those who have taken the time to read this and help me out.
Okay so onto the problem, i had a precor 9.23 tread mill break on me and a friend gave me his so i decided to take mine apart.
It would randomly not work for weeks at a time then just start one day working and stop.
I took it apart and with a basic meter probed around, i got the motor to work with a 24V psu at greatly reduced speed but the motor runs just fine.
So i decided to short out the 2 mosfet's (d-s) on the driver just to see what would happen. and of course the motor ran full speed, then i unshorted them and the driver was able to work on its own, vary the speed with out any problems.
So i went to bed and woke up and again the driver would not work and it was not plugged in over night. So again i short out the mosfet's and turn it on and again the motor goes full speed. I then turned it off and unshorted them and then the controller was running just fine for the whole day.
Im not to sure what part would be bad. maybe im discharging a faulty cap or the mosfets are bad and somehow go back to working after being shorted for a bit.
Seeing as most the parts on the motor driver circuit are ranging around 5$ each i wanted to try to narrow it down besides replacing all mosfets, caps, rectifier and diodes.
From my testing it seems the mosfets are fine as they do work and stay working for long periods of time.
The caps are nice and flat
Im thinking maybe its the rectifier
Some details on the motor its a 90V 25A 3hp
Its a big motor the largest i have ever seen on a treadmill.
My goal is to get the original controller working and mod it to run on my mill or lathe. It also has a actuator that would be kinda nice to use to raise and lower the head on my round column mill but thats just me getting lazy.
Below are images of the board and 2 mosfet's and rectifier
The first time i shorted it out it made a nice good spark.
Okay so onto the problem, i had a precor 9.23 tread mill break on me and a friend gave me his so i decided to take mine apart.
It would randomly not work for weeks at a time then just start one day working and stop.
I took it apart and with a basic meter probed around, i got the motor to work with a 24V psu at greatly reduced speed but the motor runs just fine.
So i decided to short out the 2 mosfet's (d-s) on the driver just to see what would happen. and of course the motor ran full speed, then i unshorted them and the driver was able to work on its own, vary the speed with out any problems.
So i went to bed and woke up and again the driver would not work and it was not plugged in over night. So again i short out the mosfet's and turn it on and again the motor goes full speed. I then turned it off and unshorted them and then the controller was running just fine for the whole day.
Im not to sure what part would be bad. maybe im discharging a faulty cap or the mosfets are bad and somehow go back to working after being shorted for a bit.
Seeing as most the parts on the motor driver circuit are ranging around 5$ each i wanted to try to narrow it down besides replacing all mosfets, caps, rectifier and diodes.
From my testing it seems the mosfets are fine as they do work and stay working for long periods of time.
The caps are nice and flat
Im thinking maybe its the rectifier
Some details on the motor its a 90V 25A 3hp
Its a big motor the largest i have ever seen on a treadmill.
My goal is to get the original controller working and mod it to run on my mill or lathe. It also has a actuator that would be kinda nice to use to raise and lower the head on my round column mill but thats just me getting lazy.
Below are images of the board and 2 mosfet's and rectifier
The first time i shorted it out it made a nice good spark.