Certification for the Converter
12-3
590+ Series DC Digital Converter
EMC Installation Options
The unit, when installed for Class A operation, will be compliant with EN55011 (1991)/
EN55022 (1994) for radiated emissions, as described below.
Screening & Earthing (cubicle mounted, Class A)
Note:
The installation requirements of local safety standards must be achieved regarding the
safety of electrical equipment for machines.
The unit is installed for Class A operation when mounted inside a cubicle having 10dB
attenuation between 30 and 100MHz (typically the attenuation provided by a metal cabinet with
no aperture of dimension greater than 0.15m (0.5 feet), using the recommended ac supply filter
and having met all cabling requirements.
Note:
Radiated magnetic and electric fields inside the cubicle will be high and any components
fitted inside must be sufficiently immune.
The VSD, external filter and associated equipment are mounted on to a conducting, metal
mounting panel. Do not use cubicle constructions that use insulating mounting panels or
undefined mounting structures. Cables between the VSD and motor must be screened or
armoured and terminated at the VSD or locally on the back panel.
Single VSD - Single Motor
Apply a single point series earthing strategy for a single VSD mounted in a cubicle as shown.
The protective earth connection (PE) to the motor must be run inside the screened cable between
the motor and VSD and be connected to a separate star point earth terminal near the VSD.
VSD
Back Panel
Cubicle
Motor
AC Supply
U-clip used to
terminate screen
connection to
the back panel
Armoured/screened cable
* As short as possible
(0.3m (1 foot) maximum)
External
Filter
PE
Choke
Use an additional PE conductor where PE is <10mm cross-section
2
Star Point Earth
Metal Work Earth
*
Figure 12-1 EMC and Safety Earthing Cabling