Honeywell DCP552 Mark II - Manual (Page 30)

4-2
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.
Chapter 4. WIRING