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Can I remove DC motor driver's speed control potentiometer and drive it with microcontroller DAC output ?

R1S8k

Jul 28, 2018
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Jul 28, 2018
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24
Hi,

I was searching for 1-ph DC motor driver board that I can change the speed with a microcontroller.

The drive signal should be with DAC signal, because I'm using a PLC with relays as main output switches, but there are couple DAC output 0-10V. Which are DA0-DA1 on this pin layout:

1713571399814.png


The motor driver board is this one:

1713571474200.png

I think this driver board uses only a MOSFET with gate driver voltage using the potentiometer.

So my idea is to remove this potentiometer and instead connect the DAC lines from the PLC. Would that works ? theoretically I think it should work.
 

danadak

Feb 19, 2021
784
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Feb 19, 2021
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784
That is a PWM controller, so question is does the pot a part of
timing control on duty cycle or is it a V input to a PWM generator.

Can you get a schematic of board and/or part numbers of ICs
on board ?


Regards, Dana.
 

danadak

Feb 19, 2021
784
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Feb 19, 2021
Messages
784
Post a pic of topside of board where one can read the part numbers. Can you
find a schematic on web ?

You are looking for a "Voltage to PWM" if your posted board has no PWM on
it. And you have to match DAC range out to PWM range V input. Search
Aliexpress using that term, many hits.

This is how simple that problem can be with a trivial solution using Arduino :

1713626295906.png

Basically this generates Arduino code from blocks you setup (right hand window). Uses 8 pin
dip part. But we need to know more specs and config about your board.


Regards, Dana.
 

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crutschow

May 7, 2021
857
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May 7, 2021
Messages
857
You need a voltage to PWM board such as this, to drive a PWM to Motor driver, such as the D4184 posted by BJ.
 
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