YOKOGAWA vigilantplant DM8, Руководство пользователя

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<3. INSTALLATION, PIPING AND WIRING>
3-15
IM 12T03A01-02E
3.4.3 Wiring for Digital Output Signal
The Model DM8C density converter outputs digital signals through RS-232C interface besides
analog signal (for details of digital signal, refer to “Standard Specifications” in Chapter 1).
When using this signal, use a shielded 3-conductor cable for wiring. Cable length from the
converter to a receiving unit should be 10 m or less.
Cable termination is same as that of Section 3.4.2, however, remove the sheath of conductor 80
mm from the end.
Wiring method is also same as that of Section 3.4.1.
3.4.4 Wiring for Abnormal Status Contact Output
When an error (see Table 4.2) occurs with an abnormality in the density measuring system, a
contact signal is output.
For wiring of this contact output, use 2-conductor cable. When connecting the cable to the
converter, remove the sheath of conductor 80 mm from its end and attach a solderless terminal
for M4 screw.
Wiring method is same as that of Section 3.4.1.
3.4.5 Wiring for Power Supply
This wiring is to supply the converter with power.
Use shielded 2-conductor cable for wiring. Cable termination and wiring method are the same as
those for analog output signal in Section 3.4.2.
3.4.6 Wiring for Grounding
As a rule, the case of the density detector and the density converter should be earthed.
The grounding terminal of the detector is located on the base for the mounting bracket, and of the
converter, on the bottom of the case. Perform wiring so that ground resistance is 100Ω or less
(Class D) using a wire of 2 mm 2 nominal cross-sectional area.
5th Edition : Dec. 11, 2015-00