Honeywell DCP552 Mark II user manual Wiring

Chapter 4. WIRING

Handling Precautions

•Before connecting the lines, verify the model number and terminal numbers on the label affixed to the side panel of the DCP552. After completing, always double check to ensure all wiring has been performed correctly before turning on the power.

•The I/O signal lines and the communications lines shall maintain at least 50cm between them and the power supply line and power supply cables. Do not route these cables through the same conduit or duct.

•Make sure that no crimp-style solderless wire connectors are touching an adjacent terminal or connector.

•When connecting a thermocouple input of the DCP552 to another instrument, make sure the instrument’s input impedance totals at least 1MΩ. If less than 1MΩ, the DCP552 may not be able to detect sensor disconnection.

•Cautions when using data input devices in combination

Input of the DCP552 input or output (connected in parallel for input) to an A/D converter, analog scanner, etc., may cause dispersion of the read data. To prevent such occurrence, take one of the following corrective measures.

(1)Use a low-speed integral A/D converter.

(2)Insert an isolator with no switching power supply between the DCP552 and the A/D converter.

(3)Perform averaging with a personal computer when the data is read.

(4)If the device permits, insert an input filter.

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