Re: [CAD_CAM_EDM_DRO] Re: Brdgprt CNC2 w Centroid

Another way to test the motor is to use a 12V car battery and a 21W
indicator bulb. The bulb serves to limit the current. Wire from the
battery + to the bulb then from the bulb to orange. Orange/white goes to
battery -. The bulb should light and the motor should hold position and
be fairly hard to turn. When you turn it you will feel very distinct
steps. Repeat for the other phases. They should all behave the same with
the same torque needed to move the motor.

With a meter it can be tricky to get a reliable result because many
meters are very inaccurate at these low resistance values.

Les

On 25/01/2011 17:09, danmauch wrote:
> I forgot to answer the question about testing. First look at the motor connections to the driver. There will be 8 wires. Disconnect the orange wire and the orange/white wires. This is phase A+ . With a good VOM you should measure .3 ohms across these wires. Reconnect.
> Then do the White/black and Black wires, this is A- Reconnect. Then the Red and Red/white wires,. This is phase B, measure and reconnect. Last is the white yellow and yellow wires. B- each set of wires should be about .3 ohms so you will need a sensitve ohm meter.
> If any set of wires shows a dead short or a open circuit then that is your bad motor.
> Dan Mauch
> dmauchat camtronics-cnc.com
> low cost cases for gecko products. Kits, assembled and custom systems
> low cost stepper and servo motors.
>