Festo Контроллер позиционирования CPX-CMAX User Manual
Page 375
B. Basic controlling principles
B−33
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
Signal filter factor
Derived signals (e.g. force ramp from the pressure signal)
are filtered to improve the signal quality.
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If filtering is too strong or too weak it may destabilise
control.
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The signal filter factor can be used to influence the signal
noise that, originating from the pressure sensors, affects
the force value.
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When increasing the factor, the filter becomes faster and
consequently the noise louder. At the same time the
phase shift decreases.
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If a valve hums as a result of an increase in the amplificaĆ
tion gain, it usually helps to reduce the signal filter factor.
Reduce the signal filter factor to suppress valve humming.
This may be necessary, for example, if the demanded control
precision can only be achieved by increasing the amplification
and if in that context the valve tends to hum.