Pulse adaptation
Adaptation of the minimum pulses in order to optimize the control algorithm for the system
comprising positioner, actuator and valve. In normal control mode the parameter should be
set to "Automatic". Disable this parameter when tuning the control parameters.
For R 1.20 and upwards, the pulse adaptation is internally set to "Automatic".
States:
Default (coldstart) value:
Disabled
Automatic
Automatic
Reference variable end
End of the valid input range (corresponding to 100 % w).
The minimum span is 4.0 mA.
Range:
Default (coldstart) value:
4.00 mA to 20.00 mA
20.00 mA
Reference variable start
Start of the valid input variable (corresponding to 0 % w).
The minimum span is 4.0 mA.
Range:
Default (coldstart) value:
4.00 mA to 20.00 mA
4.00 mA
Reference variable w
Reference variable in % with consideration of reference variable start and reference
variable end.
Reference variable
w_analog
Current input signal in mA, used as reference variable in "Automatic" mode.
Reference variable
w_manual
Reference variable in mA, adjustable in "Manual" mode via communication.
Range:
3.8 mA to 22 mA
Required transit time
(filling/venting)
The transit time is defined as the time required by the system comprising positioner, actuator
and valve to pass through the complete rated travel/nominal range. The actual transit time
is extended to the entered value. If the required transit time is less than the minimum transit
time determined during initialization, the minimum transit time shall apply.
Separately adjustable for filling and venting.
Range:
Default (coldstart) value:
0 s to 75 s
0 s
Scanning rate
Time between the start of two requests to the positioner (only for IBIS).
Range:
1 to 3600 s
Serial no.
Uniquely identifies the field device combined with the manufacturer name and the device
type number.
State of fault alarm
Switching state of fault alarm output.
States:
Off,
≥
3 mA
On,
≤
1 mA
State of forced venting
If installed, the absence of the input signal forces the control valve to move in the
appropriate fail-safe position.
States:
Forced venting off with control signal >3 V
Forced venting on (i.e. actuator vented) with control signal <3 V
EB 8380-1 EN
49
List of parameters
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Summary of Contents for 3780 series
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