Cables - INVT Goodrive300-19 Series Operation Manual

Goodrive300-19 series open loop vector inverter special for hosit
C.4 Cables
C.4.1 Power cables
The dimensions of input power cables and motor cables should comply with local regulations.
•
The input power and motor cables must be able to carry the corresponding load current.
•
The cable must be rated for at least 70° C maximum permissible temperature of the conductor
in continuous use.
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The conductivity of the PE conductor must be equal to that of the phase conductor (same
cross-sectional area).
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Refer to chapter Technical data for the EMC requirements.
A symmetrical shielded motor cable (see the figure below) must be used to meet the EMC
requirements of the CE.
A 4-core conductor system is allowed for input cables, but a shielded symmetrical cable is
recommended. Compared to a 4-core conductor system, the use of a symmetrical shielded cable
reduces electromagnetic emission of the whole drive system as well as motor bearing current and
wear.
Note: A separate PE conductor is required if the conductivity of the cable shield is not
sufficient for the purpose.
To function as a protective conductor, the shield must have the same cross-sectional area as the
phase conductors when they are made of the same metal.
To effectively suppress radiated and conducted radio-frequency emissions, the shield conductivity
must be at least 1/10 of the phase conductor conductivity. The requirements are easily met with a
copper or aluminum shield. The minimum requirement of the motor cable shield of the drive is shown
below. It consists of a concentric layer of copper wires. The better and tighter the shield, the lower the
emission level and bearing currents.
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