MAN205-0195042EN Rev. A
Aug. 2011
Page 25 of 137 pages
3.3
The Pneumatic Control System
The pneumatic control system is built as follows (refer to drawing on the next page):
The compressed air is supply at a pressure of 6-8 bars.
Pressure regulator reduces the pressure to 6 bars.
Air is transmitted to the inlet of the pilot solenoid valve battery, which is mounted on a
manifold branch base. Through the manifold, all the solenoids are connected to the
compressed air supply.
The 24VDC solenoids are operated by controller.
When the solenoid is operated, it transfers the compressed air to activate the
appropriate air valve.
The pneumatic valves are of two types:
1.
Air operating, and air closing valves.
These valves operate in pairs only
(94 1 & 53 1)
and
(94 2 & 53 2)
The piping is
arranged so that a command sent from one solenoid valve opens one valve and closes
the other in the pair. In this manner each valve in the pair of valves operates opposite
each other.
2.
Air operating, and spring closing valves.
Air-activated and spring-return are fitted with two commands:
An opening command comes from a solenoid valve at a pressure of 6 bars output by the
control system, and a permanent closing by a built-in spring valve.
Solenoid-operating valves
In addition to the solenoid valves which control the air-operated valves, the pneumatic
system also has solenoid valves which have a direct action as described below:
Close door valves (39 1-2);
are servo solenoid valves which transmits compressed air
to the door closing systems.
Open door valves (38 1-2);
are servo solenoid valves which transmits compressed air
to the door opening systems
Pneumatic door safety devices:
1.
RT112
pressure switch
– (prevents the opening of the door if there is pressure
in the chamber)
2.
SMS VM8
End switch
– (prevents the pressurizing of the chamber and the door
gasket if the door is not closed)
3.
ALCO
pressure switch
– (prevents the operating of the door if there is no
vacuum in the door gasket)
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