4. Commissioning
4−5
Festo P.BE−MPA−EN en 0910d
The pilot air supply must reach a pressure of 3 ... 8 bar
immediately after it is switched on. Otherwise it is not
ensured that the valve will switch directly (see diagram).
If the pressure is less than 3 bar, there may be a delay before
the valve is switched, in spite of an electric signal being
present. The gradual pressure build−up of the overall supply
does not affect the actuator in that case. The actuator would
react suddenly (e.g. a cylinder would extend or retract
suddenly, depending on the valve function).
1
42
53
14 12
1
2
1
12/14
12/14
3
82/84
2
1 Externally supplied pilot air supply (3 ... 8 bar),
branched before the soft−star t valve
2 Safety start−up valve (slow build up in pressure of
complete supply)
Fig.4/1: Example of valve−cylinder combination with
gradual pressure build−up of the overall supply
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