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Honeywell KFC225 servos - operation Q
On Wed, 09 Mar 2005 08:33:05 +0000, Peter wrote:
.... However, superimposed onto the DC control signal (-10V to +10V or so) I saw a sinewave ripple, around 500Hz IIRC. The amplitude was only about 100mV P-P. The question is whether this is intentional, whether e.g. the servo uses the presence of this ripple as a confirmation that the computer unit is still (partially) functioning. It would be quite a clever trick, but it does mean that it isn't possible to fit a good filter onto the servo input. It could very well be intentional - I once worked with a servo system where they intentionally superimposed a triangle wave on the control V - they called it "dither". It kept the hydraulic actuator from sticking in place, so it could move smoothly. Hope This Helps! Rich |
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