SK 54xE – Users Manual for Frequency Inverters
10 BU 0505 EN-3021
1 General
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The SK 54xE series is based on the tried and tested NORD platform. The devices are characterised
by their compact design and optimum control characteristics, and have uniform parametrisation.
The devices have sensor-less 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 performance range extends from 0.25 kW bis 160.0 kW.
The use of modular modules means that the device series can be adapted to individual customer
requirements.
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 for optional functions and bus systems exist (http://www.nord.com/).
Information
Accessories
The accessories mentioned in the manual are also subject to change. Current details of these are summarised in
separate data sheets, which are available at 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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As standard, the frequency inverters are equipped with a fixed heat sink, via which the power losses
are dissipated to the environment. Alternatively, for sizes 1 - 4 there is the ColdPlate version and for
sizes 1 and 2 there is also an external heat sink version.
As standard, inverters for 230V or 400V operating voltage are supplied with an integrated mains filter.
However, versions without a mains filter are available for frequency inverters above Size 7. Frequency
inverters for 115V operating voltage are normally supplied without mains filters.
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1.1 Overview
Properties of the basic frequency inverter SK 500E:
• High starting torque and precise motor speed control setting with sensorless current vector
control
• Can be mounted next to each other without additional spacing
• Permissible ambient temperature range 0 to 50°C (please refer to the technical data)
• Frequency inverters Type SK 5xxE … -A: Integrated EMC mains filter for limit curve A1 (and
B1 for inverters Size 1 - 4) according to EN 55011, Category C2 (and C1 for inverters Size 1 - 4)
according to EN 61800-3 (not for 115 V inverters)
• Frequency inverters Type SK 5xxE … -O: without integrated EMC mains filter.
• Automatic measurement of the stator resistance or determination of the precise motor data
• Programmable direct current braking
• Integrated brake chopper for 4 quadrant operation (optional brake resistors)
• Four separate online switchable parameter sets
• RS232/485 interface via RJ12 plug connector
• Integrated USS and Modbus RTU (see BU 0050)
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