Siemens SINAMICS G120 Operating Instructions Manual page 40

Installing
4.6 Connecting the converter
Cables outside the cabinet
● All power cables (line supply cables, cables to braking resistors, as well as motor cables)
● The power cable between converter and motor must be shielded. A symmetrical, 3-wire,
● The shielded power cable to the motor must be routed separately from the cables to the
● Signal and data cables must be shielded to minimize coupled-in interference with respect
● Particularly sensitive signal cables, such as setpoint and actual value cables and, in
Cable shields
● Shielded cables must have finely stranded braided shields. Foil shields are not suitable
● Shields must be connected to the grounded housings at both ends with excellent
● Bonding connections for the cable shields should be established, where ever possible,
● Cable shields should not be interrupted, wherever possible, by intermediate terminals.
● In the case of both, the power cables and the signal and data cables, the cable shields
● As plug connectors for shielded data cables (e. g. PROFIBUS cables) only metallic or
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must be routed seperately from signal and data cables. The minimum distance should be
approximately 25 cm / 9.84 in.
three-phase cable should be used here. Shielded cables with symmetrical three-phase
conductors (L1, L2, and L3) and an integrated, 3-wire, and symmetrically arranged PE
conductor are ideal for this purpose.
motor temperature sensors (PTC/KTY) and the cable to the encoder, since the latter two
are treated as signal cables.
to capacitive, inductive, and radiative coupling.
particular, encoder cables must be routed with optimum shield bonding at both ends and
without any interruptions of the shield.
since they are much less effective.
electrical conductivity and a large contact area. Only when this method is used coupled-in
interference with respect to capacitive, inductive, and radiative coupling can be
minimized.
directly behind the cable entry into the cabinet. For power cables the EMC shield busbars
should be used. For signal and data cables the shield bonding options provided in the
cabinet units should be used.
should be connected by means of suitable EMC shield clips. These must connect the
shields to either the EMC shield busbar or the shield bonding options for signal cables
with excellent electrical conductivity and a large contact area.
metallized connector housings should be used.
SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB