Hi! Everyone,
I have a treadmill with ALATECH Alt-6100 control board.The problem I'm facing is that there was heavy arcing from the motor band then it stopped.So I tested the MOSFETs IRFP406x 2nos and found them burnt out.I replaced the Mosfets and cleaned the commutator and brushes but still found the motor arcing.The motor is a 200V DC 1.5/3 hp motor.I disconnected the motor and found that the voltage at the terminal is 165VDC when turned on in stopped condition.Checked voltage generated by motor and it doesn't go up more that 1VDC when turned by hand.Eagerly awaiting Your ideas and suggestion -TIA

 

First check the motor with DC source such as an automotive battery.
Use a suitable lamp bulb 100w or so, on the motor leads from the T.M while you do any testing, not faililiar with that model, but presumably the motor is PWM controlled if you have mosfets.
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First of all you must drive treadmill with 12v or 24v .If you see an arc , rotor wing is burn. But no arc in motor , you control main board diode ,mosfet

 

First of all you must drive treadmill with 12v or 24v .If you see an arc , rotor wing is burn.

Or worn out or dirty brushes/commutator.

 

Thank you guys for sharing more idea, I'm planning to get my treadmill repaired, I haven't used it for many months now.. I just bought it when covid came.

 

Or worn out or dirty brushes/commutator.

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So what is the meaning of the voltage reading on the motor? It is certainly not that low of a voltage you are describing. What is everybody missing here?

 

The OP said 1v when turned by hand, it would help if a little higher rpm could be used.
If still low, then most likely loss of brush contact?

 

The OP said 1v when turned by hand, it would help if a little higher rpm could be used.
If still low, then most likely loss of brush contact?

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ERDEM94 comment is, you must drive Treadmill motor with 12 or 24VDC. Unless he means just to see if there is spark or not.