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3. A low RF impedance path must be provided between the motor frame and back panel on
which the drive, choke and EMC filters are mounted. This low impedance RF path should
follow the path of the motor cables in order to minimise the loop area. Failure to do so will
result in increased conducted emissions.
A low RF impedance path will normally be achieved by:
„
Bonding the armour of the motor supply cables at one end to the motor frame, and at the
other end to the cubicle back panel. Ideally 360
o
bonding is required, which can be achieved
with cable glands, refer to Figure 3-3 360 Degree Screened Connection, page 3-3.
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Ensuring that conduit containing the motor supply cables are bonded together using braid.
The conduit should also be bonded to the motor frame and the cubicle back panel.
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The protective earth (PE) conductor exiting the filter must be connected to the protective earth
connection of the Converter. Any additional RF earth, such as a cable screen, is not a protective
earth. The EMC filter must be permanently earthed to prevent the risk of electric shock under
abnormal operating instances (such as the loss of one phase of the ac supply).
You can achieve permanent earthing by either:
•
using a copper protective earth conductor of at least 10mm²
•
installing a second conductor, in parallel connection with the protective conductor, to a
separate protective earth terminal
Each conductor must independently meet the requirements for a protective earth conductor.
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The recommended EMC filters operate from normal three-phases supplies which are balanced
with respect to earth (earth referenced supplies - TN). This minimises the earth leakage current
due to the filter capacitors between phase and earth.
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As with all power electronic drives, conducted emissions increase with motor cable length. EMC
conformance is only guaranteed up to a cable length of 50m. The cable length can be increased.
Refer to Eurotherm Drives for more information.
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