Connecting The Field Wiring; Wiring Guidelines; Load Requirements - Automation Direct DL405 User Manual

13–4
F4–04DA–1 Analog Current Output

Connecting the Field Wiring

Wiring
Guidelines
User Power
Supply
Requirements
Load
Requirements
Your company may have guidelines for wiring and cable installation. If so, you
should check those before you begin the installation. Here are some general things
to consider.
S
Use the shortest wiring route whenever possible.
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Use shielded wiring and ground the shield at the module or the power
supply return (0V). Do not ground the shield at both the module and the
transducer.
S
Don't run the signal wiring next to large motors, high current switches,
or transformers. This may cause noise problems.
S
Route the wiring through an approved cable housing to minimize the
risk of accidental damage. Check local and national codes to choose
the correct method for your application.
The F4–04DA–1 requires at least one field-side supply. You may use the same or
separate power sources for the module supply and loop supply. The module
requires 21.6 to 26.4 VDC, Class 2, at 75 mA current. The four current loops require
18 to 30 VDC, at 20 mA each.
The DL430/440/450 CPUs, D4–RS Remote I/O Controller, and D4–EX Expansion
Units have built-in 24 VDC power supplies that provide up to 400mA of current. You
may use one of these instead of a separate supply if you have only a couple of
analog modules. The current required is 75 mA (module), plus 80 mA (four current
loops) for a total of 155 mA.
In some situations it's desirable to power the loops separately due to power budget
or due to their remote location from the PLC. This will work, as long as the loop
supply meets the voltage and current requirements, and its minus (–) side and the
module supply's (–) side are connected together.
WARNING: If you are using the 24 VDC base power supply, make sure you
calculate the power budget. Exceeding the power budget can cause unpredictable
system operation that can lead to a risk of personal injury or damage to equipment.
Each channel in use must have a load impedance less than 620 ohms at18V, 910
ohms at 24V, or 1200 ohms at 30V. Unused channels must be left disconnected.