Emc-Compliant Installation (Examples) - Siemens G120P Technical Manual

5.6 EMC-compliant installation (examples)

Connections and
interference suppression
Cabling
Siemens
Building Technologies
Variable speed drives are designed for operation in industrial environments where
a high level of electromagnetic interference is likely to be present. Safe, reliable
and disturbance-free operation is only guaranteed if the variable speed drive is
installed professionally and in compliance with EMC regulations. Please therefore
observe the following installation principles.
General
● Contactor coils, relays, solenoid valves, and motor holding brakes must feature
interference suppressors which reduce high frequency interference when the
contacts are opened.
● Create the connections as permanent connections.
● Use special washers which penetrate the insulation surface for screw
connections on painted or anodized metal components. This serves to create a
metallically conducting contact. Alternatively, you can remove the insulation
surface at the contact points.
● Lay line and motor cables separate from the signal and data cables. Maintain a
minimum clearance of approximately 25 cm.
● Use shielded cables with finely stranded braided shields for the motor cable.
Use three-core, symmetrical three-phase cable.
● Lay the shielded power cable to the motor separately from the two motor
temperature sensor cables (PTC / KTY / Pt 1000) because they are treated like
signal cables.
● Shield the signal and data cables in order to avoid inductive or capacitive
interference or stray radiation. Lay particularly sensitive signal cables, such as
setpoint or actual value cables, in such a way that optimized and interruption-
free shield bonding exists at either end.
● Lay the shields over as large a surface as possible at either end, with optimized
electrical conductivity to the grounded enclosure.
● Avoid interruptions in cable shields caused by intermediate terminals or service
switches without a conductive metal housing.
EMC-compliant wiring for Power Modules with degree of protection
IP20
Install and operate variable speed drives with IP20 degree of protection in a
closed control cabinet.
The diagram below shows a typical EMC-compliant installation for devices with
degree of protection IP20:
EMC-compliant installation (examples)
Installing
5
45 | 98
A5E36496664A_d
2016-03-17