Festo CPA-SC Series, Manual

Page: 71 / 140

3. Installation
3−17
Festo P.BE−CPASC−EN en 0808c
3.3.3 Vacuum/low pressure operation
Thefollowing conditions must be fulfilled in order that the
CPA−SC valve terminal can be operated via supply connection
(1) with vacuum or low pressure
(
,
−0.9 to
.
3 bar):
the valve terminal must be operated with closed−loop
regulated external pilot air
The valve terminal is fitted only with the following valve
plates and, in some cases has two pressure zones.
Valve sub−bases
Pressure zone with vacuum
or low pressure supply via
connection (1) The pressure zone must be fitted only with the following valve plates:
5/2−way valve, single−solenoid (Ident. code M)
5/2−way valve, double−solenoid (Ident. code J)
5/3−way valves (Ident. code B, E and G)
3/2−way valve (Ident. code X) see also following note.
The valve plates with Ident. codes N, K and I are
not resistant to
vacuum or low pressure if they are supplied via connection 1.
Pressure zone with
overpressure supply
1)
viaconnection (1)
The pressure zone can also be fitted with the following valve plates:
2 x 3/2−way valves (Ident. code N, K)
2 x 2/2−way valves (Ident. code I), see also following note
1)
According to diagrams Fig.A/1 and Fig.A/2
Tab.3/2: Valve sub−bases