Siemens SIMOTRAS 6SG7050, Operating Instructions Manual

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01.04 Connections
SIEMENS AG 6SG7000-0BA76
6-9
SIMOTRAS HD Operating Instructions
Rule 10
The shields of analog signal cables may be connected to ground at both ends (conductively over a
large area) if potential bonding is good. Potential bonding can be assumed to be good if all metal
parts are well connected and all the electronic components involved are supplied from the same
source.
The single-ended shield connection prevents low-frequency, capacitive noise from being coupled in
(e.g. 50 Hz hum). The shield connection should then be made in the cabinet. In this case, the shield
may be connected by means of a sheath wire.
The cable to the temperature sensor on the motor (X174:22 und X174:23) must be shielded and
connected to ground at both ends.
Rule 11
The RI suppression filter must always be mounted close to the suspected noise source. The filter
must be mounted over the largest possible area with the cabinet housing, mounting plate, etc.
Incoming and outgoing cables must be routed separately.
Rule 12
To ensure adherence to limit value class A1, the use of RI suppression filters is obligatory.
Additional loads must be connected on the line side of the filter.
The control system used and the other wiring in the cubicle determines whether an additional line
filter needs to be installed.
Rule 13
Unshielded motor cables may be used in SIMOTRAS HS drive systems.
The line supply cable must be routed at a distance of at least 20 cm from the motor cables (stator,
rotor). Use a metal partition if necessary.
Footnotes:
1) Signal cables are defined as:
Digital signal cable: Analog signal cable.:
Pulse encoder cables e.g. + 10 V setpoint cable
Serial interfaces, e.g. PROFIBUS-DP
2) The term "Ground" generally refers to all metallic, conductive components which can be
connected to a protective conductor, e.g. cabinet housing, motor housing, foundation grounder,
etc.
Cabinet design and shielding:
The cabinet design illustrated in Figure 1 is intended to make the user aware of EMC-critical
components. The example does not claim to include all possible cabinet components and their
respective mounting possibilities.
Details which influence the noise immunity/radiation of the cabinet and are not absolutely clear in
the overview diagram are described in
Figures 1a - 1d .
Figures 2a -2d show details of different shield connection techniques with ordering source
information.
Arrangement of RI suppression filters:
Section 6.2.2.3 shows how RI suppression filters are arranged in the SIMOTRAS HD system. The
specified sequence for installing the filters must be observed. Fuses for semiconductor protection
are selected according to Section 6.4.