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4-2
Chapter 4. WIRING
Handling Precautions
• Before wiring the DCP32, check the DCP32 model No. and terminal Nos.
on the label on the rear of the body.
After wiring the DCP32, be sure to check the wiring for any mistakes
before turning the power ON.
• Maintain a distance of at least 50 cm between I/O signal leads or
communications leads and the power lead. Also, do not pass these leads
through the same piping or wiring duct.
• When wiring with crimped terminals, take care to prevent contact with
adjacent terminals.
• When connecting the DCP32's thermocouples in parallel to other
controllers, make sure that the total input impedance of the other
controllers is at least 1 M
Ω
.
If the input impedance is less than 1 M
Ω
, the DCP32 may not be able to
detect sensor disconnection.
• Precautions when combining the DCP32 with other data input device
When inputting the DCP32’s I/O (parallel connection in case of input) to
an A/D converter or analog scanner, read data may fluctuate.
To prevent this, adopt one of the following measures.
①
Use a low-speed, integrating type A/D converter.
②
Insert an isolator without a switching power supply between the
DCP32 and A/D converter.
③
Average the data on a personal computer when reading data.
④
If possible, set a filter for the input.
• Provide a switch within the operator's reach on the instrumentation
power supply wiring for turning the mains power OFF.
• Provide a delay-type (T) rated current 1A and rated voltage 250 V fuse
on the instrumentation power supply wiring. (IEC 127)