80-4280-10, Rev. 4
35
The following methods describe how to
enable/disable position feedback, Set the 0% and
100% milliamp values, and select the desired
feedback response.
HART
method
HART DD Menu Location: MENU 5D
Functions> Configuration> Feedback Setup
Command: Feedback
Selections:
Enabled -
Select to enable position feedback.
Disabled -
Select to disable position feedback.
Command: FB RngLwr
Enter the decimal milliamp value that corresponds
with 0% position (typically 4 mA)
Command: FB RngUpr
Enter the decimal milliamp value that corresponds
with 100% position (typically 20 mA)
Command: FB Curve
Selections:
Linear -
Select for Linear feedback signal
Inverted Demand -
Select for Inverted Demand
feedback signal
SERIAL
command method
Command: iomode
Arguments:
#
:
0: Disabled -
Select to disable position feedback.
1: Enabled -
Select to enable position feedback.
(e.g.: “iomode 1” enables position feedback)
Command: fdbk0pctma
Arguments:
#.##
: Enter the decimal milliamp
value that corresponds with 0% position (e.g.:
“fdbk0pctma 4.0” will configure the unit to have a
4 mA position feedback at 0% position)
Command: fdbk100pctma
Arguments:
#.##
: Enter the decimal milliamp
value that corresponds with 100% position (e.g.:
“fdbk0pctma 20.0” will configure the unit to have a
20 mA position feedback at 100% position)
Command: fdbkfunc
Arguments:
#
:
0:Linear -
Sets the feedback to Linear.
1:Inverse Demand -
Sets the feedback to Inverse
Demand.
(e.g.: “fdbkfunc 0” sets the position feedback to
linear)
DEMAND CALIBRATION
Group 22 actuators are calibrated to respond
to a 4-20 mA (or 1-5 Vdc) control signal to set the
actuator position. Factory calibration assigns 4
mA as the 0% and 20 mA as the 100% Demand
signal response unless otherwise specified.
It is not necessary to calibrate the Demand
input when the actuator is installed. Several
guidelines must be followed if you elect to calibrate
the Demand response. The value for 0% must be
greater than 0.5 mA and the value for 100% must
be less than 21 mA. The difference between 0%
and 100% must be at least 4 mA. Contact the
factory for details regarding split-range operation.
PUSHBUTTONS
method
1. Ensure the Handswitch is in the “STOP”
position. This will prevent the actuator from
repositioning during this procedure.
2. Apply the desired 0% Demand input signal to
the actuator (e.g., 4 mA for 4–20 mA input).
3. Press and hold the “CALIBRATE” pushbutton
on the DCM customer interface panel, then
press the “SET DEM 0%” pushbutton until the
“ACKNOWLEDGE” LED is lit.*
4. Apply the desired 100% Demand input signal
to the actuator (e.g., 20 mA for 4–20 mA input).
5. Press and hold the “CALIBRATE” pushbutton
on the DCM customer interface panel, then
press the “SET DEM 100%” pushbutton until
the “ACKNOWLEDGE” LED is lit.*
6. Turn the Handswitch to the “AUTO” position.
NOTE: The actuator may reposition.
7. Run the actuator through its full operating
range to ensure proper response to the
Demand input signal.
HART
method
HART DD Menu Location: MENU 5C
Functions> Configuration> Demand Setup
Command: DemRngLwr
Enter the decimal value of the 0% Demand signal
(e.g.: 4.00). Remember to press the SEND key
to execute the change.
Command: DemRngUpr
Enter the decimal value of the 100% Demand
signal (e.g.: 20.00). Remember to press the
SEND key to execute the change.
SERIAL
command method
Commands: dem0pctma, dem100pctma
Arguments:
#.##
: Enter the decimal value for the
0% and 100% respectively.
(e.g.: dem0pctma 4.00)
