Festo MPA Series - Manual override (MO)

4. Commissioning
4−6
Festo P.BE−MPA−EN en 0910d
The table below shows the effects of gradual start−up
pressurisation when there are electric signals:
External pilot
air supply
Pressure rise
in overall
supply
Pressure rise in
the pilot air
supply (12/14)
Time when a
valve reverses
Movement of
the actuator
Branched after the
soft−start valve
Slow Slow After pressure
rise at (1)
Fast
Branched in front
of the soft−start
valve
Slow Fast Before pressure
rise at (1)
Slow
Tab.4/1: Effects of slow start−up pressurisation
4.2 Manual override (MO)
You should use the manual override especially when
commissioning the pneumatic system, in order to check the
function and operation of the valve or the valve−actuator
combination.
By actuating the manual override, you can switch the valve
without an electric signal. You only need to switch on the
compressed air supply.
The manual override has been designed to be used as
follows:
Type of actuation
Mode of operation
Non−detenting After actuation the manual
override is reset automatically
by a spring.
Turning with detent The manual override remains
actuated until it is reset by hand.
Tab.4/2: Actuation types of the manual override