DCV 700 thyristor panels

Latest Technology, High Performance, and a User

Friendly Concept – the New DCV 700 Series

The DCV 700 series is a complete range of DC converters intended for the

supply and control of DC machines, in stand-alone or multi-drive systems

with high performance and reliability specifications.

Wide Variety of Industrial

Applications

The DCV 700 series can handle the most demanding

applications in:

• rolling mills

• pulp and paper

• metals (casters, processing lines etc.)

• material handling (cranes, hoists etc.)

Digital Control

To meet the most stringent control requirements,

the DCV 700 features speed control, which reduces

the effects from gear backlash and torsional

vibration arising in mechanical systems.

High-performance speed and torque control will

fulfill all requirements for rapid response and

control accuracy. Autotuning for armature current

control will simplify the commissioning

procedure.

DCV 700 converters are fully digital and mounted

in an enclosure complete with all necessary

equipment, meeting the most stringent safety

standards. The converter can be used for standard

applications but has the flexibility to be

customized for the most demanding applications.

Comprehensive Product Range

DCV 700 converters are available as 6-/ and 12-

pulse 2- or 4-quadrant, in a current range 22 to

5150/10300 A and supply voltages of 200 to 1000

VAC. A selection of options is available to provide

the user with a system meeting the most demanding

technical requirements and performance expectations.

Common control electronics throughout the range

reduces spare parts inventory and training requirements

Diagnostics

Digital control allows comprehensive diagnostics,

including for example detection of

• overcurrent

• overvoltage

• earth faults

Troubleshooting is easily undertaken via the

Control Panel and the Commissioning and Maintenance

Tools.

Commonality with AC Drives –

Flexible System Configurations

Some of the most important features and benefits

common to both the DC and AC drives are:

• application control system (APC) – fewer spare

parts

• link to automation systems

• commissioning, maintenance and programming

tools – less training

• control panel – quick information

• drive-MNS cabinets – standardization benefits;

possibility to build mixed systems

• EMC design available

The thyristor bridge can be 2-quadrant (6 thyristors)

or 4-quadrant (12 thyristors). For current ratings

up to 700 A the thyristor bridge consists of

integrated thyristor modules – more compact,

cost effective, less components – so the fuses are

installed outside the module, in the supply line.

For higher current ratings, disc thyristors are

used, so there is a branch fuse for each thyristor.

Each thyristor is protected by a snubber circuit.

AC voltage, AC current and DC voltage are

monitored. These measurements are utilized by

the converter software for supervision and protection.

Overvoltage protection by means of

varistors is also provided.

Converters are always equipped with a cooling

fan integrated in the converter module.

The monitor and protective features, provided as

standard and listed below, have been designed,

keeping in mind, personnel safety, equipment

integrity and continuity of the process.

Motor: Loss of speed feedback

Overtemperature

Overload

Overspeed

Stall

Armature overcurrent

Armature overcurrent

Armature current ripple

Armature overvoltage

Minimum field current

Field overcurrent

Converter: Thyristor temperature

Supply: Main supply undervoltage

Auxiliary supply undervoltage

Wrong phase sequence

The converter includes emergency stop and prevention

of unexpected start-up as standard protective

functions. The software also includes a

fault logger storing up to 100 faults in real time.

Information on internal signals is stored in the

data logger and it can be displayed by the

Commissioning and Maintenance Tool for easy

fault finding.

Several Solutions

• Ratings from 6 to 450 A

• Integrated, separate or external

• 2-phase or 3-phase versions

• Digital control

• Auto/manual tuning

In the DCV 700, an autotransformer is included to

reduce voltage ripple in the field circuit by adapting

the AC voltage to a suitable level.

The field exciters are controlled via a serial link with

a speed of 62.5 kBaud for fast and accurate control.

Fig. 3 shows the connections of the field exciter.

Diode Field Exciter

2-phase, integrated in the converter module, 6 A

The diode field exciter is a diode bridge rated up to

6 A with internal minimum field supervision, without

any need for adjustment.

Digital Controlled Field Exciters

2-phase, 1-quadrant, integrated in the converter

module, 16 A

(max. 6 A in converter modules up to 50 A max.

8 A in converter modules up to 75 A, max. 16 A

in converter modules 110...700 A)

Half controlled thyristor/diode bridge, microprocessor

controlled with the electronics supplied from the

armature circuit converter. To achieve high resolution

in current measurement, the current feedback

can be adapted to different current levels such as 3,

5, 7, 9, 11, 13, 15, 17 A.

Insulation voltage 600 V, operation voltage £ 500 V.

2-phase, 1-quadrant, outside the converter module,

50 A

Half controlled thyristor/diode bridge, microprocessor

controlled, with separate power supply (115/230