Information
If set accordingly, the lower limit
Low limit AIN 1
can be used for monitoring the set-
point signal. Refer to <Failure behaviour on loss of signal>.
8.6.13.
Split Range operation
Requirements
●
<Additional inputs> or additional <Parallel interface>.
●
<Positioner> function must be enabled and activated:
Function
In Split Range operation, a setpoint position E1 can be shared by up to three
positioners. A typical application example is a pipeline with a by-pass. The actuator
mounted on the by-pass reacts in the lower limit (e.g. 0 – 10 mA), the actuator on
the main valve in the upper limit (e.g. 10 – 20 mA). If the setpoint position is within
the setpoint range defined for the individual actuator, the actuator behaviour will be
identical to standard positioner operation. If the setpoint position is higher or lower
than the upper or the lower limit of the setpoint range of the respective actuator, the
actuator will run to positions OPEN or CLOSED.
The upper and lower limit of the respective actuator is defined via the analogue input.
(<Input range of setpoint position>)
In addition, the upper and lower limit of the total target value (valid for all actuators
grouped in a split range operation).
Activate split range operation
Required user level:
Specialist (4)
or higher.
Device configuration M0053
Application functions M0178
Activation M0212
Split range operation M01650
Default value:
Function not active
Setting values:
Function not active
<Split range operation> function deactivated.
Function active
<Split range operation> function activated.
Set total target value range
The set lower limit of total target value is used as failure source for failure behaviour
during split range operation: <Failure behaviour on loss of signal>
Customer settings M0041
Positioner M0145
Low limit target value M01651
High limit target value M01652
Default values:
Low limit target value
=
0.0 mA
High limit target value
=
20.0 mA
Setting ranges:
0.0 ... 20.0 mA
8.7.
Process controller
Requirements
This function requires one of the following equipments within the actuator:
●
Electronic control unit with MWG (non-intrusive version)
●
Potentiometer
●
Electronic position transmitter EWG/RWG
Further conditions for the process controller operation mode:
●
Process controller enabled and activated.
●
Operation mode
Remote
(Selector switch = position Remote control).
Characteristics
The following figure illustrates the function of the process controller:
67
Actuator controls
ACV 01.2/ACVExC 01.2 Profibus DP
Application functions
