[speed33317]

Hello,

Would like to Ohm out some DC brush motors on a 1991 VF1

Does anyone know the specs? or the Wattage the motors are rated at.

Thanks

[Precision MT]

Speed,

I recommend using a megger and checking the motor resistance leg to ground (disconnect from the amp first!). If it's under 1meg ohm then you have a problem.

Thank you,

[Al_The_Man]

One problem to watch when using a high voltage megger (550v/1kv) is that the megger can induce tracking on carbon traces.
I tend to use a low voltage meter, or better still, if the motors have been in operation for some years, indicated by low brush length, I remove the end bell and clean them first.
Typically DC brushed should not be left for more than two brushes replacements before reconditioning, minimum.
Al.

[Precision MT]

Al,

That is very interesting, but I have not had any problems in the field. Have you seen any problems associated with this?

Thank you,

[haastec]

One problem to watch when using a high voltage megger (550v/1kv) is that the megger can induce tracking on carbon traces.
I tend to use a low voltage meter, or better still, if the motors have been in operation for some years, indicated by low brush length, I remove the end bell and clean them first.
Typically DC brushed should not be left for more than two brushes replacements before reconditioning, minimum.
Al.

+1

[Al_The_Man]

Al,

That is very interesting, but I have not had any problems in the field. Have you seen any problems associated with this?

Thank you,

Yes I have personally seen it happen, a small illuminated trace occurs through the carbon track, it most likely was there before to some degree, but the Megger only aggravates the situation, and burns the insulation if persisted.
Al.