Advantech PCI-1240 Manual de usuario descargar pdf (Pagina 41)

33 Chapter 3

3.14 Field Wiring Considerations

When you use the PCI-1240/PCI-1240U to acquire data from outside,

noises in the environment might significantly affect the accuracy of your

measurements if due cautions are not taken. The following measures will

helpful to reduce possible interference running signal wires between sig-

nal sources and the PCI-1240/PCI-1240U.

• The signal cables must be kept away from strong electromagnetic

sources such as power lines, large electric motors, circuit breakers or

welding machines, since they may cause strong electromagnetic inter-

ference. Keep the analog signal cables away from any video monitor,

since it can significantly affect a data acquisition system.

• If the cable travels through an area with significant electromagnetic

interference, you should adopt individually shielded, twisted-pair wires

as the analog input cable. This type of cable has its signal wires twisted

together and shielded with a metal mesh. The metal mesh should only

be connected to one point at the signal source ground.

• Avoid running the signal cables through any conduit that might have

power lines in it.

• If you have to place your signal cable parallel to a power line that has a

high voltage or high current running through it, try to keep a safe dis-

tance between them. Or you should place the signal cable at a right

angle to the power line to minimize the undesirable effect.

• The signals transmitted on the cable will be directly affected by the

quality of the cable. In order to ensure better signal quality, we recom-

mend that you use the PCL-10251 shielded cable.

It is optional to connect encoder A/B phase

feedback signal. If connect to encoder signal,

user can read the real position from PCI-1240/

PCI-1240U.

If the environment has high noise or the

connection is long, we recommend you to use

twist pair cable for servo drives.

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Advantech PCI-1240 Manual de usuario Pagina 41