590+ Series DC Digital Converter - ssdservice.pl

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All Variable Speed Drives (VSDs) potentially produce electrical emissions which are radiated
into the environment and conducted back into the ac supply. VSDs are inherently immune to any
additional external electrical noise. The following information is provided to maximise the
Electro Magnetic Compatibility (EMC) of VSDs and systems in their intended operating
environment, by minimising their emissions and maximising their immunity.
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EN55011/EN55022 radiated emission measurements are made between 30MHz and 1GHz in the
far field at a distance of 10 to 30 metres (32.8 to 98.4 feet). Limits lower than 30MHz or in close
proximity are not specified. Emissions from individual components tend to be additive.
• Use a screened/armoured cable between VSD/cubicle and motor containing the motor
protective earth (PE) connection. It should have a 360° screen termination. Earth screen at
both ends connecting to the motor frame and VSD/cubicle backplate. Maintain the screen
integrity using 360° terminations.
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• Keep unshielded cable as short as possible inside the cubicle.
• Always maintain the integrity of the shield.
• If the cable is interrupted to insert contactors etc., re-connect the screen using the shortest
possible route.
• Keep the length of screen stripped-back as short as possible when making screen
connections.
• Ideally use 360° screen terminations using cable glands or `U’ clips on power screen rails.
If a shielded cable is not available, lay unshielded motor cables in a metal conduit which will act
as a shield. The conduit must be continuous with a direct electrical contact to the VSD and motor
housing. If links are necessary, use braid with a minimum cross sectional area of 10mm 2 .
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Local wiring regulations may require the protective earth connection of the motor to be
connected locally, i.e. not as specified in these instructions. This will not cause shielding
problems because of the relatively high RF impedance of the local earth connection.
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