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Footnotes
1)
2)
SINAMICS DCP
Operating Instructions, 05/2016, A5E34382853K
Signal and power cables must be physically separated (to prevent coupling paths).
Minimum clearance: 20 cm should be aimed at. If it is not possible to physically sepa-
rate the signal cable and electric power cable, the signal cable must be decoupled ei-
ther using a partition or by routing it in a metal conduit. The partition or metal conduit
must be grounded at several points. If it is not possible to prevent signal and power
cables crossing, make sure that they cross at right angles only.
Ground the shields of digital signal cables at both ends (source and destination), ensur-
ing maximum contact area and good conductivity. In the event of poor equipotential
bonding between the shield connections, run an additional equalizing conductor with a
cross-section of at least 10 mm² parallel to the shield for the purpose of reducing the
shield current. Generally speaking, the shields may also be connected to the cabinet
enclosure (ground)
at several points. The shields can be connected several times
2)
even outside the control cabinet. Foil shields should be avoided, as they are are at
least 5 times less effective than braided shields.
Shields for analog signal cables may be connected to ground at both ends if equipoten-
tial 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.
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 and PROFINET
Generally speaking, "ground" refers to all metallic conductive parts that can be con-
nected to a protective conductor, such as the cabinet enclosure, motor enclosure, or
foundation ground.
Electrical connection
6.1 EMC-compliant installation
39
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