3
Mounting and pneumatic installation
Festo – P.BE-CPX-CMAX-SYS-EN – en 2017-09b – English
35
The proportional directional control valves VPWP-4/-6/-8 with characteristic Q6/Q8/Q10 (mounted
fitting) possess from the factory a blue releasing ring at working port 2 and a black releasing ring at
working port 4. Fig. 3.12 shows a schematic view of the tubing between a cylinder (example) and the
VPWP. Tab. 3.8 shows the correct assignment of the ports of all permitted drives.
–
+
1
2
3
4
1
Working port 2 (blue releasing ring):
}
Drive moves in the positive direction
2
Proportional directional control valve VPWP
3
Filter regulator with 5 μm filter, without
lubricator
4
Working port 4 (black releasing ring):
}
Drive moves in the negative direction
Fig. 3.12 Pneumatic circuit diagram – example (without additional pneumatic circuitry)
Note
If the load or operating voltage for the CMAX is switched off or both are switched off,
the VPWP proportional directional control valve will move to the mid-position. If the
supply pressure remains switched on, due to the asymmetries in the piston pusher
system of the proportional directional control valve, the drive can move slowly into an
end position of the cylinder.
To place the system into a special status in certain applications, an additional pneumatic circuit is re
quired, which can be implemented with the VABP sub-base, for example. Notes on this
è
www.festo.com/catalogue. In addition, the guideline for safety engineering from Festo contains
various circuit recommendations (
è
