[dak70]

I have a cnc machine with this motor..(STP-MTR-23079) from automation direct. Its a NEMA23, Bipolar.
The gecko drive died. I replaced the gecko drive controller and now the fuse from the power supply to the gecko for this motor blows only with the motor connected. If I disconnect the motor and power up the system the fuse does not blow. If I connect an older motor that was replaced previously the fuse (5amp ceramic) still does not blow.
Is there a way to check this newer motor for an internal short with a multi-meter? I wonder if something to it when the gecko blew; or is this motor what killed the old gecko drive.....

Thanks in advance!
Dennis

[neilw20]

Each winding should have a similar resistance. Spec sheets should give value.
There should be no measurable continuity between the two windings or to the frame of the motor.
If you you don't have 2 isolated windings of similar resistance find another motor.
Notice how using the correct size fuse protected the electronics.