Re: Help with Amada 103 hidraulic brake press. Servo drivers - DC motor with encoder - Feedback LOOP - hctl-1100 - mc1408 - rc4136
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The control system may be a little more complicated that what you envision.? Many feedback control systems utilize a rate encoder rather than position.? Older ones output a voltage that is proportional to motor shaft rotational rate however new ones output a frequency that is proportional to motor shaft rate.? By utilizing a frequency output the encoder signal is no longer sensitive to DC bias coupling noise.??
The rate signal is fed back through both an differentiator to generate an acceleration measurement and an integrator which produces a position measurement.? Over time the feedback integration capacitor begins to leak and position errors are introduced.? This is what I expect is happening to your break press.? I would suggest locating the integration capacitor and replacing it with a new one.??
Sam
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