Emc-Compliant Drive Installation (Installation Instructions) - Siemens SINAMICS DCM Operating Instructions Manual

6.1.2

EMC-compliant drive installation (installation instructions)

General information
Not only are drives operated in a wide variety of environments, but the electrical components
used (controllers, switch mode power supplies, and so on) can also differ widely with respect
to interference immunity and interference emission levels, meaning that all installation
guidelines of any kind can offer is a practical compromise. For this reason, EMC rules do not
need to be implemented to the letter in all cases, provided that measures are tested on a
case-by-case basis.
In order to ensure electromagnetic compatibility (EMC) in your control cabinets in rugged
electrical environments and adhere to the standards required by the relevant legislating
body, the EMC rules listed below should be followed during the construction and design
stages.
Rules 1 to 10 apply on a general level. Rules 11 to 15 must be followed in order to fulfill
interference emission standards.
Rules for EMC-compliant installation
1
2
3
4
5
6
7
8
SINAMICS DCM DC Converter
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
Connect all metallic parts of the control cabinet to one another over a flat area with
good conductivity (not paint against paint!). Use contact or scratch washers if
necessary. The cabinet door must be connected to the cabinet using the shortest
possible ground strips (at the top, center, and bottom).
Contactors, relays, solenoid valves, electromechanical operating hours counters, etc.,
in the cabinet and - where applicable - in neighboring cabinets - must be provided with
quenching combinations such as RC elements, varistors, and diodes. These must be
connected directly at the appropriate coil.
Whenever possible, guide signal cables
Unshielded cables in the same circuit (outgoing/incoming conductors) must be twisted
where possible, or the area between them minimized, to prevent unnecessary frame
antennae.
Connect spare wires to the cabinet ground
shielding effect.
Avoid unnecessary cable lengths. in order to keep coupling capacities and inductances
low.
Crosstalk is generally reduced if the cables are laid close to the control cabinet ground.
Do not, therefore, route cables freely around the cabinet, but lay them as close as
possible to the cabinet enclosure/mounting plates. This also applies to spare cables.
Signal and power cables must be physically separated (to prevent coupling paths).
Minimum clearance: You should aim for a minimum of 20 cm.
If it is not possible to physically separate the encoder and motor cables, the encoder
cable must be decoupled either using a partition or by laying it in a metal conduit. The
partition or metal conduit must be grounded at several points.
6.1 Instructions for EMC-compliant drive installation
into the cabinet at one level only.
1)
at both ends. This achieves an additional
2)
Connecting
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