7.9
Electromagnetic compatibility of variable-speed drives
EMC (electromagnetic compatibility) means that the devices function satisfactorily without
interfering with other devices and without being disrupted by other devices. EMC applies when
the emitted interference (emission level) and the interference immunity are matched with each
other.
The product standard IEC/EN 61800-3 describes the EMC requirements placed on "Variable-
speed drive systems".
A variable-speed drive system (or Power Drive System PDS) consists of the inverter as well
as the associated electric motors and encoders including the connecting cables.
The driven machine is not part of the drive system.
Note
PDS as component of machines or systems
When you install PDS into machines or systems, additional measures may be required so that
the product standards of these machines or systems is complied with. The machine or system
builder is responsible for taking these measures.
Environments and categories
Environments
IEC/EN 61800-3 makes a distinction between the "first environment" and "second
environment" - and defines different requirements for these environments.
● First environment:
Residential buildings or locations at which the PDS is directly connected to a public low-
voltage supply without intermediate transformer.
● Second environment:
All industrial plant/systems or locations that are connected to the public grid through their
own, dedicated transformer.
Categories
IEC/EN 61800-3 makes a distinction between four drive system categories:
● Category C1:
Drive systems for rated voltages < 1000 V for unrestricted use in the "first environment"
● Category C2:
Stationary PDS for rated voltages < 1000 V for operation in the "second environment".
Appropriately qualified personnel are required to install the PDS. An appropriately trained
and qualified person has the necessary experience for installing and commissioning a PDS,
including the associated EMC aspects.
Additional measures are required for operation in the "first environment".
Technical data
7.9 Electromagnetic compatibility of variable-speed drives
Power Module PM240-2
Hardware Installation Manual, 08/2017, A5E33294624B AG
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