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 (0.8 feet) of the
following parts of the VSD system:
x
Variable Speed Drive (VSD)
x
Input or output chokes/transformers
x
The cable between VSD and motor (even when screened/armoured)
x
AC/DC brushed motors (due to commutation)
x
Relays and contactors (even when suppressed)
From experience, the following equipment is particularly sensitive and requires careful
installation.
x
Any transducers which produce low level analogue outputs (<1V) , e.g. load cells, strain
gauges, thermocouples, piezoelectric transducers, anemometers, LVDTs
x
Wide band width control inputs (>100Hz)
x
AM radios (long and medium wave only)
x
Video cameras and closed circuit TV
x
Office personal computers
x
Capacitive devices such as proximity sensors and level transducers
x
Mains borne communication systems
x
Equipment not suitable for operation in the intended EMC environment, i.e. with
insufficient immunity to new EMC standards