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.
If filtering is too strong or too weak it may destabilise
control.
The signal filter factor can be used to influence the signal
noise that, originating from the pressure sensors, affects
the force value.
When increasing
the factor, the filter becomes faster and
consequently the noise louder. At the same time the
phase shift decreases.
If a valve hums as a result of an increase in the amplifica
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.
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