Motor drive voltages reversed AX3500

12 years 2 months ago #28096997 by jjknittle
Motor drive voltages reversed AX3500 was created by jjknittle
I am setting up an AX3500. While performing an initial check of the system, I find that the CHannel1 and Channel2 outputs are negative polarity for a positive command input voltage.

I am set to run in analog mode with separate control.

My test is very simple - using the internal 47K divider, I biased the ANA1 control line with a 10K pull up to the 5V supply (dsub15-pin 7). The result was -9.3V from the M1+ to M1- terminals. Conversely connecting the 10K to ground (dsub15-pin 6) gives me a 9.3V positive output. The same effect happens for the second channel.

I checked to make sure the invert command was disabled.


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12 years 2 months ago #28129488 by cosma
Replied by cosma on topic Re:Motor drive voltages reversed AX3500

There is no convetion for which polarity make a motor spin in which direction. Consider the M+ and M- terminal as a reference so that wiring a motor to a different channel or controller will make the motor turn in the same direction.

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12 years 2 months ago #28131497 by jjknittle
Replied by jjknittle on topic Re:Motor drive voltages reversed AX3500
I'm not concerned about the motor direction at this point - I know which direction it will turn with applied voltage.

I just expected that a positive command (2.5V to 5V) on the ANA1 line would apply a positive drive to the output. That is, M1+ would be positive with respect to M1-, regardless of what is connected.

It works like it has commands inverted.

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