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Design for Double-Acting Actuators
15. DESIGN FOR DOUBLE-ACTING ACTUATORS
This control head has been configured for process valves actuated pneumatically (AA) on both sides. Of the two
internal solenoid valves, one is designed for NC mode of operation and the other for NO mode of operation.
15.1. Anomalies
This design can be configured for all electrical designs.
This control head differs from IntelliTop 2.0 (standard) in the following points:
• Solenoid valve 1: NC / Normally Closed;
Solenoid valve 2: NO / Normally Open (as a result rest position)
• The flow rate from P to A2 may be restricted to 50 l/min only, otherwise a reliable
switchover (from A2 to R) cannot be guaranteed!
• only Autotune function 1 and 2 possible
• The setting "All valves can be actuated (simultaneously)" has no function.
15.2. Fluid diagram
See "Fig. 4: Fluid diagram (model for double-acting actuators: 2 solenoid valves, NC* + NO**)" on page 17.
15.3. Electrical connection (24 V / 120 V design)
To open or close the process valve, both solenoid valves V1 and V2 are switched simultaneously by the software.
When a signal is applied to Y1, valves V1 and V2 are actuated simultaneously by software for the designs "24 V"
and "120 V".
Input valve control Y1 Solenoid valves
Y1 ON V1 and V2 ON
Y1 OFF V1 and V2 OFF
15.4. Programming data (AS-i design)
To open or close the process valve, both solenoid valves V1 and V2 are switched simultaneously by the software.
In the case of design "AS-i" the solenoid valves V1 and V2 are switched ON simultaneously when data bit
D0 = 1 and both solenoid valves are switched OFF when D0 = 0.
Data bit D0 Solenoid valves
D0 ON V1 and V2 ON
D0 OFF V1 and V2 OFF
Compare also Chapter "11.8. Programming data" on page 54 for the standard designs, "Bit configuration"
table.
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