NORD Drivesystems BU0505 - Manual (Page 10)

SK 54xE – Users Manual for Frequency Inverters
10 BU 0505 GB-1013
1. General
The SK 500E series is based on the tried and tested NORD platform. These devices feature a
compact design with optimum control characteristics.
These frequency inverters are provided with sensorless vector current control system which in
combination with asynchronous three-phase motor types constantly ensures an optimised voltage-to-
frequency ratio. For the drive unit, this means very high starting and overload torques with constant
speed.
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.
This series of frequency inverters can be adapted to individual requirements by means of the modular
technology units.
Due to the wide range of setting options, these inverters can control all three-phase motors. The
power range is from 0.25 kW to 90.0 kW with integrated mains filter.
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/ ).
There are additional descriptions for the optional functions "Functional Safety "(BU 0530) and the
"POSICON" positioning system (BU 0510) and the memory programmable "PLC" control units
(BU0550). Supplementary descriptions for the optional bus systems are also available
http://www.nord.com/ ).
Note Accessories
The accessories mentioned in the manual (brake resistors, filters etc.) may also be subject to modifications.
Current details of these are included in separate data sheets, which are listed under
www.nord.com under the
heading
Documentation → Manuals → Frequency inverters → Data sheets. 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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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)
• Integrated EMC mains filter for limit curve A1 (and B1 for size 1 - 4 devices) as per EN55011
(not for 115V devices)
• 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
• USS-integrated (see BU 0050)