Siemens PM330 Hardware Installation Manual page 60

Connecting up, switching on
4.7 EMC compliant connection
● The shields of the signal cables at the Control Unit must be connected at the Power
Module below the mounted Control Unit using the shield connecting terminals provided at
the slits available for the purpose.
The cables are mechanically fixed (strain relief) using cable ties, also below the mounted
Control Unit at the locations provided below the slits used for mounting.
Cables outside the cabinet
● All power cables (line cables, DC link cables, connecting cables between the Braking
Module and the associated braking resistor as well as motor cables) must be routed
separately from signal and data cables. The minimum distance should be approximately
25 cm.
● To achieve categories C2 and C3 according to EN 61800-3, a shielded cable must be
used between the converter and motor, and for higher power ratings a symmetrical, 3-
conductor three-phase cable should be used. Shielded cables with symmetrical three-
phase conductors (L1, L2, and L3) and an integrated, 3-conductor, and symmetrically
arranged PE conductor are ideal for this purpose.
● The shielded cable to the motor must be routed separately from the cables to the motor
temperature sensors (PTC/KTY); this is because the cables to the motor temperature
sensors should be treated as signal cables.
● Signal and data cables must be shielded to minimize coupled-in interference (capacitive,
inductive, and radiated).
● Especially sensitive signal cables - such as setpoint and actual value cables - should be
routed without any interruption with optimum shield support at both ends
Cable shields
● Shielded cables must have finely stranded braided shields. Shields that are not as finely
braided, such as the concentric conductors used in Protodur NYCWY cables, do not have
such an effective shielding effect. Foil shields have a significantly poorer shielding effect
and are therefore unsuitable.
● Shields must be connected to the grounded housings at both ends with excellent
electrical conductivity and a large contact area. Only when this method is used can
coupled-in interference be minimized (capacitive, inductive, radiated).
● Wherever possible, cable shields should be connected directly after they enter the
cabinet. The EMC shield bars should be used for power cables; the shield connection
options provided in the built-in and cabinet units should be used for signal and data
cables.
● Wherever possible, cable shields should not be interrupted by using intermediate
terminals.
● In the case of both, the power cables and the signal and data cables, the cable shields
should be connected by means of suitable EMC shield clips. The shield clips must
connect the shield through a large surface area with low associated inductance to the
EMC shield bar or the shield connection option for signal cables.
● Only metal or metallized plug housings should be used for plug-in connections for
shielded data cables (e.g. PROFIBUS cables).
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Hardware Installation Manual, 12/2018, A5E32844552B AF
Power Module PM330