Siemens SINAMICS DCM Operating Instructions Manual page 60

Connecting
6.1 Instructions for EMC-compliant drive installation
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Footnotes
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Cabinet configuration and shielding
Figure 6-3 Shielding at control cabinet inlet
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Shields for analog signal cables may be connected to ground at both ends if
equipotential bonding is good (this must be done over a large area with good
conductivity). It can be assumed that equipotential bonding is good if all metal parts
are well interconnected and the electronics components are supplied from a single
source.
Connecting shields at one end prevents low-frequency, capacitive interference
injections (e.g. 50 Hz humming). In this case, the shield should be connected in the
control cabinet; a sheath wire may also be used for this purpose.
The cable to the temperature sensor on the motor (X177:53 to 55) must be shielded
and connected to ground at both ends.
Ensure that the RFI suppression filter is always located close to the suspected source
of interference. The filter must be attached to the cabinet enclosure, mounting plate,
etc., over a flat area. Incoming and outgoing cables must be physically separated.
RFI suppression filters must be used in order to conform to limit value class A1.
Additional loads must be connected upstream of the filter (on the line side).
The controller used and the manner in which the rest of the control cabinet is wired
will determine whether an additional line filter needs to be installed.
A line reactor must be included in the field circuit for controlled field power supplies.
A line reactor must be included in the armature circuit of the converter.
The motor cables do not have to be shielded. There must be a clearance of at least
20 cm between the power supply and the motor cables (field, armature). Use a
partition if necessary.
Signal cables are defined as:
Digital signal cables: e.g. cables for incremental encoders
Analog signal cables: e.g. ±10 V setpoint cable
Serial interfaces: e.g. PROFIBUS DP
Generally speaking, "ground" refers to all metallic conductive parts that can be
connected to a protective conductor, such as the cabinet enclosure, motor enclosure,
or foundation ground.
SINAMICS DCM Control Module
Operating Instructions, 06.2010, C98130-A7067-A1-02-7619