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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
Certification for the Converter
12-5
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