Gentlemen,
I just returned from visiting my newborn granddaughter in PA. I saw enough snow for the year while there too.
So, I'm catching up on some of my emails.
If you use a 100 volt DC power supply with the drives rated 100 volts (R990H) they will not only fault, they will most likely blow.
I would keep your motor power supply between 80-90 volts. This leaves a good 10% margin. Also, be sure not to skimp on filter capacitors. 1000 mfd for each amp is a good guide. I use 24000 mfd for a two axis machine with motors rated six amps continuous, 26 amps peak. I have measured the voltage accross a 1 ohm shunt resistor in series with the motor power wires with my O scope) and the calucalated current often reaches 16 amps momentarily when I am driving the motors hard. Normally these motors are only drawing 4 amps, so you can see that values range widely. I really think I could get away with less capacitance, but I'm not changing my setup. You want capacitors that can obsorb enough fluctuation that they keep the motor power lower than the rated voltage of the drive (100 volts).
Tom Eldredge
Rutex, LLC
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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