Certification for the Converter 12-3
590 Series DC Digital Converter
EMC Installation Options
The unit, when installed for Class B operation, will be compliant with EN55011 (1991)/
EN55022 (1994) for radiated emissions, as described below.
Screening & Earthing (cubicle mounted, Class B)
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 B 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), 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.
Single VSD - Multiple Motors
Note: Refer to Chapter 13: “Application Notes” - Using Multiple Motors on a Single Drive.
If connecting multiple motors to a single VSD, use a star junction point for motor cable
connections. Use a metal box with entry and exit cable glands to maintain shield integrity.
Refer to Chapter 13: “Using Multiple Motors on a Single Converter”.
590
Back Panel
Cubicle
Motor
AC Supply
U-clip used to
terminate screen
connection to
the back panel
Armoured/screened cable
* As short as possible
(0.3 metres maximum)
External
Filter
PE
Choke
Use an additional PE connector where PE
is <10mm cross-section
2
A second PE connection is required to the
filter on the 720/800A chassis units
Star Point Earth
Metal Work Earth
*
Figure 0-1 EMC and Safety Earthing Cabling
To Next Page
Loading...
