Drive Design; Final Position Feedback - Pepperl+Fuchs FD0-VC-Ex4.FF Manual

6.5.3

Drive design

For subsequently setting the parameter "Actuator Fail Action", the "target mode" of the trans-
ducer block must be set to "Out of Service (OOS)" as it is possible only here to make a modifica-
tion.
Drive design "Actuator Fail Action"
The valve coupler supports the two most frequent drive designs "self-opening" and "self-closing". For the
definition of these two terms the drive and the control valve must be considered a unit. The terms "self-open-
ing" and "self-closing" designate the behaviour of the drive when setting the electrical control system to "0",
irrespective of the behaviour of the drive during a failure of the auxiliary power. The following values can be
set:
• Undefined
• Self-opening
• Self-closing
The value "undefined" has been set at the factory. Indication of the drive design is required for configuration.
The transducer block leaves the mode "Out of Service" only if one of the two options "self-opening" or "self-
closing" is set.
From the setting of the "Actuator Fail Action" the transducer block determines whether or not the connected
auxiliary valve must be controlled electrically for starting a set position set by the function block.
If a double-acting drive shall be controlled this must be done via two channels and thus via two DO function
blocks and two transducer blocks.
6.5.4

Final position feedback

The response of the final position feedback is influenced via two parameters:
• "Sensor usage" describes whether a final position feedback is connected to the valve coupler and wheth-
er its signals shall be evaluated.
• If the signal of the final position feedback are evaluated, "PV_D generation" determines how to further
process the evaluated PFC signals prior to transferring them to the function block.
When using the setup wizard, the type of position feedback is analysed and "Sensor usage" is
set automatically at one of the options A to D.
To manually set the parameter "Sensor usage" and "PV_D generation" the "target mode" of the
transducer block must be set to "Out of Service (OOS)" as it is possible only here to make a
modification.
Prerequisite
The parameter "Actuator Fail Action" was assigned a value for the design of the drive.
"Sensor usage"
The following settings are possible:
• No position detection
• Use sensor values for PV_D
• A: C2, I0, O1
• B: C1, I3, O2
• C: C1, I0, O2
• D: C2, I3, O1
Subject to reasonable modifications due to technical advances.
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Fieldbus Valve Coupler FD0-VC-Ex4.FF
Parameterisation and operation of the valve coupler
Copyright Pepperl+Fuchs, Printed in Germany