NORD Drivesystems BU0700 - Manual (Page 4)

NORDAC SK 700E Operating Manual
4 Subject to technical alterations BU 0700 GB-1411
1 General information
The series NORDAC SK 700E is the follow-on development of the proven vector series. These devices are characterised by
the high modularity and excellent control characteristics.
These devices are provided with non-sensor vector current control system which constantly ensures an optimised voltage-to-
frequency ratio in combination with a motor model of an three-phase asynchronous motor. This has the following significance
for the drive: Peak start-up and overload torques at constant speed.
Due to its modular construction, the variously combinable technology units, customer units and special extension units, this
device series is suitable for all possible applications.
Devices for constant load:
Due to the numerous setting options, these inverters are capable of controlling all three-phase motors. The performance range
goes from 1.5kW to 22kW (3~ 380V...480V) with an integrated line filter and from 30kW to 132kW (3~ 380V...480V) with
optional external line filter. The overload capacity of these devices is 200% for 3.5 seconds and 150% for 60 seconds.
Device for quadratically increasing loads SK 700E-163-340-O-VT:
In the performance range 160kW (3~ 380V...480V) a variant for quadratically increasing load is available. This load profile is
typical for fans and various pump applications. In contrast to the devices used for constant load torque, the overload capacity
here is limited to 125%.
NOTE: The SK 700E with the performance range 30kW to 160kW varies in some technical details from the lower
performance devices. Details can be found in this manual.
This manual is based on the device software V3.4 Rev4 (P707) for the SK 700E. If the frequency inverter used has a different
version, this may lead to some differences. If necessary, you can download the current manual from the Internet
(
http://www.nord.com/
)
The most important amendments in comparison with edition 3910 are the correction of errors and amendments associated with
UL certification.
1.1 Overview
Properties of the basic device:

Heavy starting torque and precise motor speed control setting with sensorless current/vector control.

Can be mounted next to each other without additional spacing

Permissible environmental temperature range: 0 to 50°C (please refer to technical data)

Integrated line filter for limit curve A as per EN 55011 (up to and including 22kW)

Automatic measurement of the stator resistance

Programmable direct current braking

Integrated brake chopper for 4 quadrant drive

Four separate online switchable parameter sets
The characteristics of the basic equipment with an additional technology unit, customer unit or special extension unit are
described in Chapter 3, 'Operation and displays'.