Certification for the Converter 12-5
590 Series DC Digital Converter
Sensitive Equipment
The proximity of the source and victim circuit has a large effect on radiated coupling. The
electromagnetic fields produced by VSDs falls off rapidly with distance from the
cabling/cubicle. Remember that the radiated fields from EMC compliant drive systems are
measured at least 10m from the equipment, over the band 30-1000MHz. Any equipment placed
closer than this will see larger magnitude fields, especially when very close to the Converter.
Do not place magnetic/electric field sensitive equipment within 0.25 metres of the following
parts of the VSD system:
• Variable Speed Drive (VSD)
• EMC output filters
• Input or output chokes/transformers
• The cable between VSD and motor (even when screened/armoured)
• Connections to external braking chopper and resistor (even when screened/armoured)
• AC/DC brushed motors (due to commutation)
• DC link connections (even when screened/armoured)
• Relays and contactors (even when suppressed)
From experience, the following equipment is particularly sensitive and requires careful
installation.
• Any transducers which produce low level analogue outputs (<1V) , e.g. load cells, strain
gauges, thermocouples, piezoelectric transducers, anemometers, LVDTs
• Wide band width control inputs (>100Hz)
• AM radios (long and medium wave only)
• Video cameras and closed circuit TV
• Office personal computers
• Capacitive devices such as proximity sensors and level transducers
• Mains borne communication systems
• Equipment not suitable for operation in the intended EMC environment, i.e. with
insufficient immunity to new EMC standards
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