Re: [CAD_CAM_EDM_DRO] Power Supply Voltage/ballast resistor

On Tue, 07 Oct 2003 21:40:48 -0000, you wrote:

>I have some Vexta PK266-01a-C23 steppers that I will be driving with
>Allegro 5804's. The Vexta's are rated 7.4 volts 1A 7.4 ohm. I
>assume that the power supply voltage - 7.4V (Vexta rating) would be
>the voltage drop of the ballast resistor. To further that would be
>the resisance of the ballast resistor would be the voltage drop
>acroos the ballst resistor/1A (Vexta Rating) . SO for a 12VDC power
>supply there would be a 4.6 volt drop across the ballast resistor at
>1 A would be 4.6 ohms ? 5 Watts?

5 ohms 10 watts would be available, also perhaps (better) 4.7 ohms, 10
watts.

If the allegro is a chopper drive, forget the above.

Harvey