96 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
Figure 46 to Figure 50 show examples of RTD input wiring (2-wire and 3-wire RTDs). Four-wire RTD
inputs are not available.
Figure 46 – RTD Inputs
OHMs Inputs
Ohms inputs are wired similar to 2-wire RTD inputs. That is, they require a current source, and thus must
use one of the I
RTD
current sources. Also, two terminals are jumpered together as they are for two-wire
RTD inputs.
Analog channels wired for Ohms inputs differ from RTD inputs in these aspects:
Ohms inputs connect to variable resistance devices other than RTDs, and
Ohms inputs are configured in Designer Software as Ohms inputs, rather than as RTD inputs.
Examples of wiring for resistance inputs are given in Figure 50 .
Shield Grounding
Shields must be grounded as described under Shield Grounding at the beginning of this section.
Hazardous voltages exist at terminal blocks.
Using switches at field devices disconnect the field wiring from power sources before servicing.
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