September 2021
Installation, Operation and Maintenance Manual
VCIOM-01249-EN Rev. 0
34
Operating the F01-2000
Section 5: Operating the F01-2000
4 - 20 mA analog input
The 4 - 20 mA analog input is the position request R% signal and is used by the F01-2000
to position the valve in inching and modulating actuators. The “POSITIONER” routine
processes the input signal, compares the present actuator position % with the position
request R% and if the difference is greater than the dead band, the actuator is driven to
reach the requested position. 4 mA corresponds to request R% = 0% = valve closed and
20 mA corresponds to request R% = 100% = valve open. The relationship between position
and request signals can be reversed by the “Polarity” function. The 4 - 20 mA input is
opto-coupled. The input impedance is less than 500 ohm. The loss of the 4 - 20 mA input
signal is indicated as follows:
•
Change-over of the monitor relay
•
Alarm LED on
•
List of ALARMS (see Section 12.10, Diagnostic messages)
•
Alarm log
Figure 30 shows the wiring diagram.
Figure 30
B9
B8
Actuator terminals
Cable
0 V DC
4 - 20 mA
GROUND
Shield
4 - 20 mA
generator
0 V
The “VIEW and SET-UP” features can configure different options which are described in
Section 9.1.7, Positioner.
If the POSITIONER function is active the alpha-numeric display indicates the value of the
position request in % (R%: xxx.x).
NORMAL REMOTE
R:47% NEXT?
Figure 31
