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© Copyright by BIFFI Italia. All rights reserved.
“ICON2000”
instruction and operating manual
Section 618/2 chapt. E
Section 618/2
The 4-20mA output is opto-coupled. It should be powered by a 20-30 VDC voltage
(externally or internally generated) and the maximum load, including the cable resistance,
should be less than 300 Ohm.
The figure below shows the wiring diagram:
The behaviour in case of loss of main voltage is different if the power supply of the 4-20mA
output stage is internally or externally generated:
• Internal power supply (or passive loop):
In case of loss of main voltage the output 4-20mA 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 a lithium battery (or supplied by the auxiliary 24VDC) and if
the main voltage fails, the output 4-20mA maintains the last value. If the actuator is moved
by handwheel, the output 4-20mA will be updated.
Actuator terminals
ACTIVE LOOP
PASSIVE LOOP
cable
0V
4-20mA
B6
B7
GROUND
shield
20 -30
Vdc
External power supply
LOAD: max 300 Ohm
Internal power supply
cable
0V
V+
4-20mA
B7
C10
GROUND
shield
LOAD: max 300 Ohm
A Hardware alarm is generated if the ICON2000 was set to be equipped with BUS card, but
the card is damaged or missing. A BUS REPORT is also present in the list of reports if the
card is present (see chap. F). See the specific manuals for instructions and the setting of the
above modules
8.2 AIN / AOUT CARD
With the above card the ICON2000 is provided with a 4-20 analogue input and a 4-20mA
analogue 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
ICON2000 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
chap. F).
4-20mA analogue output
The 4-20mA 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 4-20mA output signal. See “VIEW and SET-UP” features (chap. I, paragraph
“OUT 4-20mA”).
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