Lenze EDB9300UES - Manual (Page 94)

Transport, Installation and Connection
BA8230 89
EMC radiated interference to DIN EN50081 Part 1: Limit EN55011 Group 1 Class
B (CISPR11 Class B)
Compliance with the measures stated for CISPR11 Class A is assumed. In addition
an inphase choke is to be used at the inverter output.
Compliance with the interference voltage limit to EN55011 Class B (CISPR11 Class
B) is achieved with these measures.
The length of the motor cables is limited to max. 60 m.
In comparison to CISPR11 Class A, further measures relating to the design and
layout of the switchgear cubicle are necessary for compliance with the interference
limit CISPR11 Class B for radiated interference (30 MHz - 1000 MHz).
In particular the switchgear cubicle must be fully sealed.
Cubicles are to be designed to guarantee good HF protection, if necessary using
adapter kits after consultation with the manufacturer.
High EMC efficiency of the design in this frequency range is generally only possible
by means of earthing. All measures for function earthing must be executed with great
care. Metal PG screw connections (nickel plated brass) are to be used for the screen
contacts when feeding the screened control and power cables into the cubicle and the
motor terminal box.
Installation close to sensitive measurement and detection systems
A motor du/dt filter, if not already used for motor insulation protection, can be installed
to further reduce any interference radiated by the motor cable, in addition to the
measures stated for public electricity supply networks or the residential sector.
A du/dt filter is particularly recommended near sensitive measurement or detection
equipment, sensors or comparable sensitive control units. This also applies
particularly if radio signals in the long and medium wave band are used during
operation for controlling the plant, e.g. transponder signals.
Important!
The classification of the measures stated here applies only to connection to an
earthed network.
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