Festo MPA-FB Series, Manual

Page: 84 / 168

4. Commissioning
4−6
Festo P.BE−MPA−EN en 0502b
The table below shows the effects of slow start−up pressuriza
tion when there are electric signals.
External auxi
liary pilot air Pressure in
crease in com
plete supply Pressure in
crease in the
auxiliary pilot
air (12/14) Time point
when a valve
switches Movement of
the actuator
branched after the
safety start−up
valve slow slow after pressure in
crease at (1)
fast
branched in front
of the safety start−
up valve slow fast before pressure
increase at (1)
slow
Table4/1: Effects of slow start−up pressurization
4.2 Manual override
You should use the manual override especially when commis
sioning 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 fol
lows:
Method of actuation Method of operation
non−locking After actuation the manual over
ride is reset automatically by a
spring.
manual override locking The manual override remains ac
tuated until it is reset by hand.
Table4/2: Actuation methods of the manual override