Festo MPA-FB Series, Manual

Page: 57 / 168

3. Installation
3−11
Festo P.BE−MPA−EN en 0502b
3.3.1 Pilot control of the valve solenoid coils (auxiliary pilot air)
Depending on the variant of the pneumatic interface or MP
sub−base, pilot control of the valve solenoid coils can be car
ried out with internal or external auxiliary pilot air. You can
ascertain the pilot control variant for which your MPA valve
terminal is equipped, by the following features (see table).
Pilot control variants Pilot control connection 12/14 on the pneumatic
interface, MP or MPM sub−base:
Operation with external auxiliary pilot
air marked and open.
Operation with internal auxiliary pilot air not marked and closed.
Table3/1: Recogniton features of the pilot control variants
Internal auxiliary pilot air If the operating pressure lies between 3 ... 8 bar, you can op
erate the pilot control of the valve solenoid coils with inter
nally branched auxiliary pilot air. In this case, the auxiliary
pilot air is branched from supply channel 1 in the pneumatic
interface, in the MP or MPM sub−base.
Please note
·
Internal auxiliary pilot air is branched centrally from sup
ply connection 1 in the pneumatic interface or MP sub−
base. This also applies when the MPA valve terminal is
operated with several pressure zones (see Fig.3/3 and
Fig.3/4).
External auxiliary pilot air If the operating pressure lies below 3 bar or above 8 bar, pilot
control of the valve solenoid coils must be operated with ex
ternal auxiliary pilot air. In this case, the auxiliary pilot air is
supplied externally via pilot connection 12/14.