Vicpas IND110, Техническое руководство

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IND110 Technical Manual
5-5
Analog Output 4/20 mA Connections
The output signal provided is a standard 4/20 mA signal commonly used for many
industrial process control and PLC applications. Since this signal is analog in nature, it
must be well shielded, properly grounded and protected from higher voltage signals.
Do not route this signal cable with power wiring.
Proper grounding is important. This instrument connects the load cell shield, power
supply common and 4/20 mA common lines together. As a result, connect only one of
these points to an earth ground. Many process control instruments connect their 4/20
mA common to earth internally. If true, this system must remain floating without a
ground connection. Test for process control equipment ground continuity before wiring
is completed. If it is not grounded, connect the IND110 at the load cell shield terminal
to earth ground. If it IS connected to ground, be sure the IND110 wiring is NOT
grounded.
The 4/20 mA current loop external wiring should be two conductor #20 AWG
(0.51MM
2
) (MIN) shielded cable. Use Belden #8759 or equal and connect as shown
below.
Figure 12