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Electrical installation
RD 500 RD42
DOK-RD500*-RD42*******-IB03-EN-P
Rule 9
All variable-speed motors must be connected-up using shielded cables.
The shields must be connected at both ends to the housings/enclosures
through a low-inductance connection (large surface area). The motor
cables must also be shielded inside the cabinet or at least shielded using
separating sheet metal panels.
Rule 10
Steel-shielded cables are not suitable.
Rule 11
A suitable PG gland with shield contact can be used to connect the shield
at the motor (e.g. “SKINDICHT SHV/SRE/E”, from the Lapp Company,
Stuttgart). It should be ensured that there is a low-impedance connection
between the motor terminal box and motor enclosure. If required, connect
using an additional grounding conductor.
Never use motor terminal boxes manufactured out of plastic!
Rule 12
The shield between the motor and AC drive converter may not be
interrupted, i.e. by mounting components such as output reactors,
sinusoidal filters, motor filters, fuses, contactors. The components should
be mounted on a mounting panel, which simultaneously serves as a
screen connection for the incoming and outgoing motor cable. If required,
separating sheet metal panels should be used to shield the components.
