Preparing for use
Explosion-protected machines
94 56100000002002, 01/2016
4.7 Converter operation
4.7.1 Parameterizing the converter
● If the design of the motor requires connection to a particular converter type, the
rating plate will contain corresponding additional information.
● Correctly parameterize the converter. Parameterizing data can be taken from the
machine rating plate (not the supplementary rating plate with the operating data
when connected to a converter).
You can find parameter data here:
– In the operating instructions for the converter.
– In the SIZER engineering tool
– In the SINAMICS Configuration Manuals.
– For explosion-protected machines, also in the declaration of compliance with
the order 2.1.
● Do not exceed the specified maximum speed limit n
max
. You can either find this
on the rating plate n
max
, under the supplementary plate for converter operation as
the highest speed, or in Catalog D81.1.
● Check that it is guaranteed that the machine is cooled for commissioning.
4.7.2 Reducing bearing currents during operation with
converter (low voltage)
Taking the following actions will reduce the bearing currents:
● Ensure that the contacts are established over a large area. Solid copper cables
are not suitable for high frequency grounding because of the skin effect.
Equipotential bonding conductors:
Use equipotential bonding conductors:
● Between motor and driven machine
● Between motor and converter
● Between the terminal box and the RF grounding point at the motor enclosure.
Selecting and connecting the cable:
As far as possible, use symmetrically arranged, shielded connection cables. The
cable shielding, made up of as many strands as possible, must have good electrical
conductivity. Braided shields made of copper or aluminum are very suitable.
● The shield is connected at both ends, at the motor and converter.
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