3. Installation
3-6
Festo P.BE-SPC11-SYS-ASI -EN en 0203NH
Compressed air reservoir ( 3 )
If the position i ng behaviour does not conform to your require-
ments, and if you ascertain fluctuations in pressure of over
1 bar at the measuring point, then proceed as follows:
S Fit a compressed air reservoir (e.g. type VZS-...-B) be-
tween the service unit and the proportional directional
control valve.
In this way you can reduce fluctuations in pressure during
operation. You can compensate for slight excesses in the per-
mitted pressure fluc tuation by using supply tubing with a
larger diameter .
Reservoir volume:
The reservoir volume should be at least four times as large as
thevolumeofthedriveused.
V
P
=4*V
Z
V
P=
buffer volume
V
Z=
cylinder volume (linear drive: V
Z
=r
2
* ð*L
Z
)
L
Z=
cylinder stroke length
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