18
System Description
• Actuation of Connection 2/A1 (Solenoid Valve 1; normally the main stroke of the process valve) using the mag-
netic manual control that is externally accessible.
(both solenoid valves are actuated simultaneously for the model for double-acting actuators)
• Special silencers with a high flow-rate capacity to connection 3/R have already been mounted.
• The interior of the housing is protected against excessive overpressure, for example due to leakages, by a
pressure-relief valve with output into the joint exhaust air connection 3/R.
5.3.6. Manual control
The control head provides the following as standard:
• a magnetic manual control that is easily accessible from the outside on the basis of encoded magnetic fields for
Solenoid Valve 1 (Connection 2/A1), as well as
• a mechanical manual control accessible when the hood is open on each equipped solenoid valve.
The magnetic manual control has the following advantages:
• the control head does not need to be opened
• simple actuation tool for opening/closing solenoid valve 1 (main stroke) -
helpful for service/maintenance work on the process valve
(both solenoid valves are actuated simultaneously for the model for double-acting actuators)
• LED display for the "activated manual control" status = service mode
(see chapters "17. LED - Color Assignments" and "18. Service Mode / Manual Control")
For a detailed description of the manual control, see Chapter "18. Service Mode / Manual Control".
5.3.7. Position measuring system
The switching positions of the process valves are reported to the actuator by feedback signals from the solderless
position measuring system. Connection to the control head is done by means of a simple adaptation to the
actuator of the process valve.
Details are described in Chapters "6.7. Position measuring system data" and "16. Position Measuring System".
5.3.8. Other features
• Central optical position indicator for showing the process valve switching positions:
Positions and status information can be indicated by 3 signal colors.
The assignment of the signal colors and the "flashing pattern", which indicates the type of fault, are described in
Chapter "17. LED - Color Assignments".
• Simple adaptation of the control head (for the position measuring system) to the process valve piston rod.
• Simple adjustment of the position measuring system by 3 Teach-In buttons on the electronics module.
• The capability of restricting the pilot valve (solenoid valve) for the individual setting of the expansion and
retraction rates of the process valve and the individual setting of the flow-rate of the working connections.
• More energy efficient solenoid valve actuation by lowering the holding current during long-term operation
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