Current-source Inverters Loher DYNAVERT I

Overview

General description
Technical data overview
Features
Customer benefits
Typical applications

General description

DYNAVERT I drive units are currentsource DC link inverters that are used to control induction motors. They have a fully controlled B6 bridge circuit on the line side and a B6 inverter circuit on the output side, which utilizes the principle of interphase commutation; this distributes the DC link current from the DC link reactors with a square waveform with frequency f to the motor winding. As a consequence, the motor cable length is almost unlimited.
The power flows from the line supply to the motor for a motoring load. For regenerative operation, the rectifier on the line-side feeds the regenerated energy back into the line supply. This means that from the inherent principle, 4-quadrant operation is possible without requiring any additional measures. 12- and 24-pulse versions further reduce the harmonics fed back into the line supply.
For this reason DYNAVERT I is the ideal replacement for SIMOVERT A.

top of page

Technical data overview

Rated input voltage	Typ. Motor rated power cabinet systems
400 V	15 - 630 kW
500 V	15 - 800 kW
690 V	45 - 5600 kW
950 V	630 - 6000 kW

Brief overview
Line supply voltage +10 %, -15 %:	3~AC 400 ... 1140 V
Line supply cos phi (1):	Depends on the motor
Line supply frequency:	50 Hz, optional 60 Hz
Maximum output frequency:	60 Hz, depends on the motor
Output voltage (basic fundamental):	3 x 0 ... line supply voltage
Motor cable length (shielded or non-shielded):	500 m, longer on request
Degree of protection:	IP21, higher degrees of protection optionally available

top of page

Features

Explosion protection

ATEX-certified for motors located in hazardous zones with Accessory kit S, also with very long motor cable length

Emergency Off

The Emergency Off function prevents unexpected starting in compliance with EN60204-1, implemented according to EN954-1, Category 3, respectively SIL2 with Accessory kit S

Power unit

12- and 24-pulse input optional posible. For this reason gi line supply (basic fundamental) of 99,9 % is possible
This corresponds to the EMC Directives (EN61800-3 environment 2) as a result of the line filter integrated as standard
Low harmonics fed back into the line supply as a result of the integrated line reactor
Long motor cable lengths possible inherent to the system
Insulation monitoring for IT line supplies for 500 / 690 V drive units as well as ground fault monitoring for TN and TT line supplies integrated in the 400 V drive units
Wide supply voltage range
Normal fuses can be used for protection (gL characteristic)

Control section

High level of personnel and plant protection through protective separation between the analog and digital control peripheral and the power unit according to VDE 0106 / EN50178

Operator control and setting

Transparent operator control and setting using a menu-prompted 4-line plain text display with membrane keypad at the drive inverter – or up to 1000 m away in the main control room via RS485
Extensive functions using the Windowsbased PC operator control program

Communication

Communication via a conventional terminal strip with freely-programmable digital and analog inputs / outputs, with
- parameterizable limit value signals
- parameterizable timers
- parameterizable damping elements
- parameterizable drive inverter behavior when inputs / outputs respond
Communication and parameterization via
- PC using IMS (Inverter Management Software) via RS232 / RS485
- external operator panel via RS485
- bus systems such as Profibus DP or Modbus RTU

Drive behavior for DYNAVERT I

Two closed-loop control types for induction motors:
- Speed control
- Torque control
Full 4-quadrant operation with regenerative braking as standard

The following generally apply

Automatic slip compensation
Stall protection using current limiting control
Flying restart circuit to connect to a rotating motor

top of page

Customer benefits

Cabinet units in IP21 or higher degrees of protection
All of the drive units have their own connection space
Compact dimensions
Equipped with radio interference suppression
Low harmonics fed back into the line supply, mainly on 12- and 24-pulse versions
Almost unlimited motor cable lengths possible inherent to the system
High overvoltage strength, e.g. load shedding of turboset in power stations
Wide supply voltage range
Full 4-quadrant operation as standard
Same user interface / software as DYNAVERT T

top of page