Festo Контроллер крайних положений SPC11 - Manual (Page 34)

3. Installation
3-6
Festo P.BE-SPC11-SYS-EN en 1406e
Compressed air reservoir ( 3 )
If the positioning 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
permitted pressure by using supply tubing with a larger
diameter.
Reservoir volume:
The reservoir volume should be at least four times as large as
the volume of the drive used.
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