September 2021
Installation, Operation and Maintenance Manual
VCIOM-01249-EN Rev. 0
33
Operating the F01-2000
Section 5: Operating the F01-2000
5.9.2
Ain/Aout Card
With the above card the F01-2000 is provided with a 4 - 20 mA analog input and a
4 - 20 mA analog output. This card should be plugged on the base card, replacing the
“TERMINAL BOARD ADAPTOR” card supplied as standard. A Hardware alarm is generated
if the F01-2000 was set to be equipped with an Ain/Aout card, and the card is damaged or
missing. An Ain/Aout REPORT is also present in the list of reports if the card is present
(see Section 6).
4 - 20 mA analog output
The 4 - 20 mA output can be configured to provide a signal proportional to either
“position” or “torque”. The polarity option allows to reverse the relationship between
the position or torque and the 4 - 20 mA output signal. See “VIEW and SET-UP” features
(Section 9.1.9, OUT 4 - 20 mA).
The 4 - 20 mA output is opto-coupled. It should be powered by a 20 - 30 V DC voltage
(externally or internally generated) and the maximum load, including the cable resistance,
should be less than 300 ohm.
Figure 29 shows the wiring diagram.
Figure 29
B6
B7
B7
C10
Actuator terminals
ACTIVE LOOP
Cable
GROUND
Shield
20 - 30
V DC
External power supply
Load: max 300 ohm
Internal power supply
Cable
GROUND
Shield
LOAD: max 300 ohm
PASSIVE LOOP
4 - 20 mA
0 V
4 - 20 mA
0 V
V+
The behavior in case of loss of main voltage is different if the power supply of the 4 - 20 mA
output stage is internally or externally generated:
•
Internal power supply (or passive loop): In case of loss of main voltage, the
output 4 - 20 mA drops to 0. The correct output will be restored when the main
voltage returns.
•
External power supply (or active loop): If the actuator is provided with an lithium
battery (or supplied by the auxiliary 24 V DC) and if the main voltage fails, the
output 4 - 20 mA maintains the last value. If the actuator is moved by handwheel,
the output 4 - 20 mA will be updated. If the actuator is not provided with an
lithium battery (or not supplied by the auxiliary 24 V DC) and if the main voltage
fails, the output 4 - 20 mA maintains the last value. If the actuator is moved by
handwheel, the output 4 - 20 mA will not be updated.
