NORDAC SK 750E manual
6 Technical design subject to change BU 0750 GB
1 General
Based on the proven SK 700E type series, the NORDAC SK 750E design was specifically adapted to demand-
ing industrial environments (up to 60°C, IP54 min.). The devices of this type series are characterized by a high
degree of modularity while ensuring optimal control performance.
Owing to sensorless vectorial current control which involves evaluation of a simulator programme based on a
three-phase asynchronous motor, the relation between voltage and frequency is constantly optimised. Thus
maximum starting and overload torques are available to the drive without the speed having to be increased.
Due to the modular construction of this type series which involves equipment boxes ("technology units"), cus-
tom interfaces and special extensions that can be exchanged with one another as required, adaptation is pos-
sible to any conceivable application.
Due to the huge variety of setting options these inverters are capable of controlling any three-phase motor on
the market. An output range from 5.5kW to 22kW (for 3 AC 400V...480V) and from 5.5kW to 11kW (for 3 AC
200…240V) is available. Line filters being always integrated. These devices allow for an overload capacity of
150 % for 60 seconds or for 200 % for 3.5 seconds respectively.
This manual presupposes that the SK 750E is operated with the V3.4R4 (P707) software. If a different soft-
ware version is stored on the frequency inverter used, accordance with the manual may not always be en-
sured. To be on the safe side the most recent manual should be downloaded from the Internet
(http://www.nord.com/).
1.1 Essentials
Characteristics of the basic unit:
Vectorial current control – for which no sensor is required – ensures a high starting torque and precise
control of the motor speed
Several units can be mounted side by side without leaving a clearance
Admissible ambient temperatures 0 to 50°C (or up to 60°C respectively, please refer to Technical Data
section)
Integrated line filter ensuring EMC and meeting limit curve A requirements as per EN55011
Stator resistance measured automatically
D.C. braking programmable
Integrated braking chopper for four-quadrant operation
Integrated RS485 interface plugged into M12 female connector
Four separate sets of parameters which can be switched while the motor remains on-line
High IP54 degree of protection (air cooling), or IP65 (special design) with water cooling
NOTE: A description of the performance of the basic unit, after it has been fitted with an extra equipment
box (technology unit), a custom interface, or a special extension is given in Section 3, "Options".
1.2 Delivery
Examine the device for transport damage such as distortions or loose parts immediately after it has ar-
rived/been unpacked.
On discovering damage contact the transport company without delay and demand that the damage be as-
sessed in accurate detail.
Important! The same provision shall apply if the packaging is undamaged.
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