Festo Smart cubic CPA-SC Series, Manual

Page: 86 / 136

4. Commissioning
4−6
Festo P.BE−CPASC−EN en 0412b
The pilot air must be applied with a pressure of 3 ... 8 bar
immediately after being switched on. Otherwise it cannot be
guaranteed that the valve will switch directly (see diagram).
If the pressure lies below 3 bar, there may be a delay before
the valve switches, in spite of an electric signal. The slow
build−up of pressure in the complete system then has no ef
fect on the actuator. The actuator would react suddenly (e.g.
a cylinder would extend or retract suddenly, depending on
the valve function).
1
4 2
5 3
14 12
1
2
1
12/14
12/14
3
82/84
2
1
Externally supplied pilot air (3 ... 8 bar), branched in
front of the safety start−up valve
2
Safety start−up valve (slow pressure build−up of the
complete supply)
Fig.4/1: Example of valve−cylinder combination with slow
pressure build−up of the complete system