Siemens SIMOVERT MASTERDRIVES Manual page 341

Communication / PROFIBUS
8.2.6.4 Shielding of the bus cable / EMC measures
Shielding
NOTE
NOTE
8.2-54
In order to ensure interference-free operation of the PROFIBUS-DP,
especially in the case of data transmission with RS485, the following
measures are imperative:
♦ For the PROFIBUS bus cable, the shield in the bus connector should
be connected to the CBP. Shielding is also provided by the shield
clamps (in the event of Compact units) or by the shield clamps and
cable ties (in the event of chassis-type units) on the converter
housing. The following illustrations show you how to use the shield
clamps. When removing the insulation from the various core ends,
please ensure that the solid copper core is not damaged.
♦ Please ensure that the shield of each bus cable is connected to
protective earth, both where it enters the cabinet as well as at the
converter housing.
Bus cables are to be laid at an angle of 90 ° to power cables if it is
necessary that the two kinds of cable intersect.
The bus cables must be twisted and shielded and are to be laid
separately from the power cables at a minimum distance of 20 cm. The
braided shield and, if necessary, the underlying foil shield as well, are to
be connected on both sides through a large surface area so that they are
highly conductive, i.e. the shield of the bus cable between two converters
is to be connected to the converter housing at both ends of the cable.
The same applies to the shielding of the bus cable between the
PROFIBUS-DP master and the converters.
Snap in the shield clamp
∅ ≤ 15 m m
∅ ≤ 7,5 m m
Release the shield clamp
Squeeze the shield clamp together with your hand
or a screwdriver and pull upwards.
Fig. 8.2-16 Using the shield clamps
∅ ≤ 5 m m
6SE7087-6QX70 (Version AG)
Compendium Motion Control
05.2006
Siemens AG
SIMOVERT MASTERDRIVES