1 General
BU 0250 en-3021 9
1 General
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The SK 250E-FDS series is based on the tried and tested NORD platform. The frequency inverters
are characterised by their compact design and optimum control characteristics, and have uniform
parametrisation.
The frequency inverters have sensorless current vector control with a wide range of settings. In
combination with suitable motor models, which always provide an optimised voltage/frequency ratio,
all three-phase asynchronous motors that are suitable for inverter operation and permanently excited
synchronous motors can be driven. For the drive unit, this means very high starting and overload
torques with constant speed.
The power range is from 0.37 kW to 7.5 kW.
This series of frequency inverters can be adapted to individual requirements by means of modular
assemblies.
This manual is based on the device software as stated in the version list (see P707). If the frequency
inverter uses a different software version, this may cause differences. If necessary, the current manual
can be downloaded from the Internet (http://www.nord.com/).
Additional descriptions exist for optional functions and bus systems (http://www.nord.com/).
The accessories that are mentioned in the manual are also subject to changes. Current details of
these are included in separate data sheets, which are listed under www.nord.com under the heading
Documentation → Manuals → Electronic drive technology → Techn. Info / Data sheet. The data
sheets available at the date of publication of this manual are listed by name in the relevant sections
(TI ...).
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A typical feature of this frequency inverter series is their installation close to the motor, e.g. on the wall
or on a machine frame.
All electrical connections (power connections and control connections) are made with plug connectors.
This considerably simplifies the installation of the frequency inverter and opening the FI is not
necessary.
In order to obtain access to all parameters, the internal RS232 interface (access via RJ12 connection)
can be used. Access to the parameters is made e.g. via an optional SimpleBox or ParameterBox.
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The parameter settings modified by the operator are backed up in the integrated, non-volatile memory
of the device.
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The device is configured according to the customer’s individual requirements. The device equipment is
therefore realised ex works. Later retrofittings of options or device conversions are not planned.
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