Siemens SINAMICS DCM Operating Instructions Manual page 57

Figure 6-2
SINAMICS DC MASTER units are nearly always used in the second environment
(Categories C3 and C4).
RFI suppression filters and line reactors are required whenever they are to be used in
Category C2.
SINAMICS DC MASTER units conform to the interference immunity requirements defined in
EN 61800-3 for the second environment, and thus also with the lower interference immunity
requirements in the first environment.
EN 55011
Some situations require compliance with EN 55011, which defines limit values for
interference emissions in industrial and residential environments. The values that are
measured are conducted interference at the line supply connection as interference voltage,
and electromagnetically radiated interference as radio interference, under standardized
conditions.
The standard defines limit values "A1" and "B1" which, for interference voltage, apply to the
150 kHz - 30 MHz range and, for radio interference, the 30 MHz - 2 GHz range. Since
SINAMICS DC MASTER converter units are used in industrial applications, they are subject
to the limit value "A1"; in order to achieve this value, the SINAMICS DC MASTER units must
be provided with external RFI suppression filters and line reactors.
SINAMICS DC MASTER: Industrial applications
Industrial applications demand that units demonstrate an extremely high level of interference
immunity, but by contrast place very low requirements on them in terms of interference
emission levels.
SINAMICS DC MASTER converter units are components of an electrical drive, such as
contactors and switches. Qualified personnel must install them into a drive system which, as
an absolute minimum, consists of the converter unit, motor cables, and motor. Line reactors
and fuses are also required in most cases. Therefore, whether or not a limit value is adhered
to is determined by the components being installed correctly. Limiting interference emission
levels in line with limit value "A1" requires not only the converter unit itself, but also the RFI
suppression filter allocated to it and the line reactor, at the very least; without an RFI
suppression filter, the interference emission level demonstrated by SINAMICS DC MASTER
converter units will exceed limit value "A1" as prescribed by EN 55011.
If the drive forms part of a system, it does not initially need to fulfill any interference emission
requirements, but the EMC Directive does require the system as a whole to be
electromagnetically compatible with its environment.
If all the control components in the system (such as PLCs) demonstrate a level of
interference immunity that is suitable for industrial applications, then it is not necessary for
every drive to adhere to limit value "A1".
SINAMICS DCM Control Module
Operating Instructions, 06.2010, C98130-A7067-A1-02-7619
Definition of categories C1 to C4
6.1 Instructions for EMC-compliant drive installation
Connecting
57