
5
Diagnostics and fault clearance
Festo – MPAC-VI-EN – 2017-12a – English
43
5.3
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
– Regulated pilot air supply
Fast reaction
Sufficient pressure supply by means
of compressed air supply
Exhaust the valve terminal via all
exhaust plates or flat plate silencers
Trouble-free
Check valves in common exhaust line
This applies when several systems
with centrally ducted exhaust air are
used
Two or more pressure
zones
– Limitation of the pressure zones
by means of separating seals in
the blocked channels
– Corresponding number of pneu
matic supply plates for supplying
the various pressure zones.
Subsequent conversion possible
(see Chapter 5)
Vacuum or
low-pressure
operation
Externally supplied regulated pilot
air supply (3 … 8 bar)
Valves with ident. code D, H, I, K }
and N are not suitable for
vacuum/low-pressure operation
EMERGENCY OFF of
pressure zones
Guarantees the controller function
for the pilot air supply despite the
overall supply being switched off
The controller regulates the pilot air
supply to all valves of a valve terminal
Slow switch-on after
EMERGENCY OFF
If control signals are present, the
pilot air supply must have a pressure
of 3 ... 8 bar immediately after being
switched on
Tab. 5.3
Pneumatic operating statuses