Ramp Generator

[lukin1977]

I need a ramp generator to be used to accelerate and desaccelerate 5 DC motors at the same time
The ramped signal will be input into each motor`s drive.
Input : 0-10VDC
Output : 0-10VDC

Anyboy knows where can I bougth a ramp generator card?

regards,

lukin1977

 

[OperaHouse]

This is the kind of thing a generic micro can do like the Arduino UNO can do. It has six 5V A/D inputs and PWM outputs. Cheap at under $15 for knock offs and FREE development system, it has all the math systems to accomplish the ramping. This could be accomplished with something as simple as a running average from the DAC

 

[Skogsgurra]

You could also use a motorized potentiometer to do the same thing. Or hook up a dual opamp with a few resistors and capacitors. Google - National Semiconductor's appnotes used to have lots of that stuff. Most drives come with some sort of ramp generator these days. You may already have what you need.

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[lukin1977]

Yes. The drives already have RAMP GENERATOR and also have PID control function.
When the PID control is enable the ramp is blocked and I am using the PID function.

I found this:

http://www.carotron.com/instmanlist/ADM290.pdf

 

[Skogsgurra]

I have an old analogue ramp generator (Siemens Transidyn). You can have that for free. But it needs +15V, -15V and +24V and is rather clumsy.

You would be much better off if you either arrange a motor pot or build a simple ramp generator with a dual opamp. If you don't care much about linearity, you could also use a resistor and a capacitor to get a soft start. That would be the simplest approach.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[lukin1977]

Thank you very much Skogsgurra but no thanks.
I am doing some tests with a PLC I found in our storage. So far very good

regards

 

[Skogsgurra]

I can understand you. Very well.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.