4 Commissioning
98 Festo – P.BE-MPA-EN – 1309f – English
Operating status of the propor-
tional pressure regulator
RemedyPossible cause
Pressure constant despite modi-
fied setpoint specific ation
Too little supply pressure p1 • Increase supply pressure.
Tab. 4.10 Functional impairment of the proportional pressure regulator
4.7.2 Operating statuses of the pneumatic system
The following requirements should be fulfilled in order to achieve the desired pneumatic operating
statuses listed below:
Desired pneumatic
operating status
Requirement Comment
Zero leakage – Tubing connected with care
– R egulated pilot air supply
—
Fast reaction Suffic ient pressure supply by mea ns
of compressed air supply
ExhausttheMPA-Svalveterminalvia
all exhaust plates.
Trouble-free Non-return valves in common exhaust
line
This applies when several systems
with centrally ducted exhaust air are
used
Two or more
pressure zones
– Limitat ion of the pressure zones
by means of separating seals with
blocked channels
– Corresponding number of
pneumatic air supply plates for
supplying the different pressure
zones
Subsequent conversion possible
( chapter 5)
Vacuum or
low-pressure
operation
Externally supplied regulated pilot air
supply
Vacuum/ low pressure operation not
with 2x 2/2- and 2x 3/2 directional
control valves (ident. code D, I, H, K, N)
EMERGENCY OFF of
pressure zones
Guarantee of the controller function
for the pilot air supply despite the
overall supply being switched off
The controller regulates the pilot air
supply to all valve sub-bases of an
MPA-S valve terminal.
Slow start-up after
EMERGENCY OFF
If control signals are present, the
pilot air supply m ust be at the
required level immediately after
switch-on
—
Tab. 4.11 Pneumatic operating statuses
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