Concentric copper or aluminum shield Steel armor
• To ensure that high-frequency currents are appropriately discharged, establish a contact
through the largest possible surface area at both ends. Establish a 360° contact of the cable
shielding on the motor enclosure and on the protective grounding bar of the converter, for
example, as follows:
– Motor side: EMC glands at the cable entries
– Converter side: EMC shield clips
• In the overall system, set up a properly meshed grounding system with low impedance for
high-frequency currents.
• No potential dierence between the motor, converter, and working machine.
– Use equipotential bonding cables between the terminal box and the high-frequency
grounding point on the motor enclosure.
– Use a separate high-frequency equipotential bonding cable between the motor enclosure
and the protective grounding bar of the converter.
– Use a separate high-frequency equipotential bonding cable between the motor enclosure
and the driven machine.
• Use the common-mode lter (damping cores) at the converter output. The SIEMENS sales
partner is responsible for selecting and dimensioning.
• Limit the rise in voltage by using output lters. Output lters dampen the harmonic content
in the output voltage.
• Use the motor reactors.
• Preferably use an IT line supply with an insulated neutral point.
The operating instructions for the converter are not part of this documentation. Carefully
comply with the instructions in the converter conguring information.
4.14.4 Insulated bearings for converter operation
If you control the machine from a low-voltage converter, depending on the machine type, use
an insulated bearing at the NDE.
Shaft height Insulated bearings NDE
100 ... 280 Optional
315 ... 450 Standard
An insulated speed encoder can be optionally mounted.
Comply with the information provided on the machine plates relating to bearing insulation
and possible jumpers.
Preparing for use
4.14Converter operation
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 11/2023, A5E52779900A 57
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