Anders Wallin wrote:
> The servo is a current drive with a +- 10 volt input.
>
^^^^^^^^^^^^^
>> As there is not much load on the drive so a +-0.4 volt will swing the motor
>> at full speed.
>>
>>
>
> Tuning with no load at all might be hard or impossible. Do you have the
> motors attached to the ballscrew/machine?
> Full speed at 0.4V command would mean you throw away a factor 20 of dynamic
> range.
> I'd suggest you do something to get full speed at closer to 8 or 9 V
> command - maybe lower the supply voltage to the drives, adjust the max
> current, or something.
>
No, he says he's running in torque mode, so this is probably right, for
that setup.
I'd suggest adding a tach and going to velocity mode, but if that is
hard, then you
have to tune it for torque mode. You might contact Igor Chudov, who is
using
Copley amps in torque mode with my (Pico Systems) analog interface. He
may have some suggestions.
Jon
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