840-A71 A-B  Communication Processor

Shielded cable has the general benefits of multi-conductor cable. It also has the benefit of a copper braided shield that can contain much of the noise that a typical AC Drive generates. Use shielded cable for installations with sensitive equipment such as weigh scales, capacitive proximity switches, and other devices that can be affected by electrical noise in the distribution system. Applications with large numbers of drives in a similar location, imposed EMC regulations, or a high degree of communications/networking are also good candidates for shielded cable. Shielded cable can also help reduce shaft voltage and induced bearing currents for some applications. In addition, the increased impedance of shielded cable can help extend the distance that the motor can be from the drive without the addition of motor protective devices, such as terminator networks. See Reflected Wave in Wiring and Grounding Guidelines for PWM AC Drives, publication DRIVES-IN001. Consider the general specifications of the environment of the installation, including temperature, flexibility, moisture characteristics, and chemical resistance. A braided shield can be included. If included, the braided shield is to be specified by the cable manufacturer as having coverage of at least 75%. An additional foil shield can greatly improve noise containment. A good example of recommended cable is Belden 295xx (xx determines gauge). This cable has four Cross-linked Polyethylene (XLPE) insulated conductors with a 100% coverage foil and an 85% coverage copper braided shield (with drain wire) surrounded by a Polyvinyl Chloride (PVC) jacket. Other types of shielded cable are available, but the use of these types can limit the allowable cable length. For example, some of the newer cables bundle four conductors of THHN wire and wrap them tightly with a foil shield. This type of construction can greatly increase the cable charging current that is required and reduce the overall drive performance. Unless specified in the individual distance tables as tested with the drive, these cables are not recommended and their performance against the lead length limits is not known.

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