I'm considering buying some 2010 cards and I have a couple of questions I'd like clarified.
What I need to know is what requirements there are for the power source to drive the card and how the encoder is powered. From what I can see the power to run the card and encoder does not come from the PC, so it must be from an external supply (15-36vdc from the r990h documentation). Is there a requirement for this voltage to be smoothed with capacitors? What I intend using for my servo motor power supply is a rewound coil from a small mig welder (overkill I know but I'm going this way for cost and convenience reasons). Should I use a second secondary winding deticated for the card and encoders or could I tap into the servo motor supply circuit and use resistors to bring the voltage level down from 48 volts to the 15-36 volt range?
Any suggestions on how to go about this?
I am not familiar with the Rutex products, but looking at the documentation they have the motor supply and also require a 15v-36v for the control circuit, they show a 5vdc supply to the encoder so obviously they have a 5v regulator on board from the 15-36 supply.
If you are winding your own transformer then maybe the best option would be to put on a 18vac secondary for the control supply, do not try and drop the motor supply down for this.
Take both motor supply and control supply DC common's to a common ground point.
The control voltage should have capacitive smoothing, but the current loading is probabally not that high so a large cap should not be required, especially if regulation is done on the boards.
That would be my approach.
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