Chris Radek <[EMAIL PROTECTED]> wrote:
> I think my linearity is much better than you describe. Maybe try
> pure pwm mode (not pdm)? Or it may just be a matter of your low
> power supply. I'm using 24V on mine.
I picked up a new power supply (24 VDC, 3.6 A), but I couldnt get my
setup to work with it.
The old setup that does work:
PC on its own internal ATX power supply.
PC parallel port connected to L298 driver circuit.
Driver logic powered by a stand-alone ATX power supply.
Driver ground tied to PC ground via parallel port ground lines.
Driver gets motor power from the stand-alone ATX +12V.
What I tried was this:
Tied the new PS ground to the rest of the system ground on the driver
circuit board.
Unplugged the stand-alone ATX 12V from the L298 motor supply input.
Plugged the 24V from the new PS to the L298 motor supply input.
When I plugged this in, the stand-alone ATX power supply would shut down.
Sketchy! Disconnecting the 24V supply and powercycling the stand-alone
ATX PS would bring it back. The PC stayed up through all this and
seemed unaffected.
My theory is that the new 24V PS ground was sinking current that the
stand-alone ATX was sourcing, tripping some sort of GFCI protection in
the stand-alone ATX power supply, causing it to temporarily shut down.
So now my plan is to get rid of the stand-alone ATX power supply entirely,
and substitute a little 5VDC, 500+ mA wall-wart transformer for the
driver logic power supply. Seem reasonable?
What power architecture are other people using?
Do you worry about ground loops?
Motor noise in the logic supply?
Is optical isolation between the PC and the servo drivers common?
--
Sebastian Kuzminsky
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