Festo MPA-S, Руководство пользователя

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3 Mounting and installation
62 Festo – P.BE-MPA-EN – 1309f – English
3.6 Connecting the MPA-S valve terminal
Connections on the following components are available for pneumatic supply to the valve terminal:
– on the electrical interface (pneumatic interface, CPI interface, multi-pin plug connection plate, AS in-
terface)
– on the optional pneumatic supply plate, maximum between each sub-base.
3.6.1 Pilot control (pilot air supply)
Dependent on the variant of the pneumatic interface, CPI interface, multiple connector plate or AS in-
terface, the pilot control is supplied with internal or external pilot air. You can ascertain the pilot control
variant for which your MPA-S valve terminal is equipped by the following features ( Tab. 3.5).
Pilot control variants Pilot connection (12/14) on the electrical interface:
Operation with external pilot air marked and open
Operation with internal pilot air supply not marked and closed
Tab. 3.5 Recognition features of the pilot control variants
Internal pilot air supply
If the operating pressure lies within the required pilot pressure range for the valves ( Appendix A,
Fig. A.1 … Fig. A.5), you can operate the pilot control with an internally branched pilot air supply.
The internal pilot air supply is branched centrally from the supply port (1) in the pneumat-
ic interface or multi-pin connection plate. This also applies when the MPA-S valve terminal
is operated with several pressure zones ( Fig. 3.6).
External pilot air supply
If the operating pressure lies below the required pilot pressure or above 8 bar ( Appendix A,
Fig. A.1 … Fig. A.5), you must operate the pilot control with an external pilot air supply.
• Preferably use regulated external pilot air supply. Reliable, trouble free operation of
the MPA-S valve terminal is then possible, e.g. even with fluctuating operating pres-
sure.
• The external pilot air supply for all solenoid coils is fed centrally via the pilot port
(12/14) on the pneumatic interface or the multi-pin plug connection plate. This is the
case even if the MPA-S valve terminal is operated with different pressure zones.
• Adapt the external pilot air supply to the operating pressure at which these valves are
operated ( diagrams in Appendix A, Fig. A.1 … Fig. A.5).
Conversion between internal and external pilot air supply is described in section 5.4.1.