BKD 6 / BKF 12 …-7000 thyristor converters for DC drives 30–2050 A, up to ≈1100 kW

Country: · Model: BKD 6 / BKF 12 …-7000

BKD 6 and BKF 12 series 7000 thyristor converters supply the armature and field winding of DC motors at rated currents of 30–2050 A, which corresponds to a drive of up to 1100 kW. They are used in machine tools, printing, paper and textile machines, winders and lifting and conveying mechanisms. The mains is three-phase, up to 500 V.

Type: microprocessor-controlled line-commutated thyristor converters for adjustable DC drives
BKD 6/…-7000: single-quadrant, fully controlled three-phase bridge B6C, rated current 30–2050 A
BKF 12/…-7000: four-quadrant, anti-parallel circuit without circulating current (B6C)2I, 30–1650 A
Drive power: ≈5–800 kW at Ua 520 V (BKF); up to ≈1100 kW at Ua 600 V (BKD)

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Technical specifications

Type	microprocessor-controlled line-commutated thyristor converters for adjustable DC drives
BKD 6/…-7000	single-quadrant, fully controlled three-phase bridge B6C, rated current 30–2050 A
BKF 12/…-7000	four-quadrant, anti-parallel circuit without circulating current (B6C)2I, 30–1650 A
Drive power	≈5–800 kW at Ua 520 V (BKF); up to ≈1100 kW at Ua 600 V (BKD)
Mains	three-phase industrial up to 500 V
Field supply	half-controlled bridge B2HKF with microprocessor field current control
Sizes	I–IV
Control	16-bit microprocessor system; optional PROFIBUS-DP, CANopen boards; WinBASS software
Certification	CE, UL

Specifications are taken from the manufacturer’s technical documentation. Updated 11/06/2026.

Description

The BKD 6 and BKF 12 versions differ only in the power section of the armature circuit. BKD 6 is single-quadrant, with a fully controlled three-phase bridge B6C, and works in motoring mode in one direction; at an armature voltage of 600 V it gives up to 1100 kW. BKF 12 is four-quadrant, with two anti-parallel bridges without circulating current (B6C)2I, so it reverses the drive and brakes with energy returned to the mains. For BKF 12 the currents are 30–1650 A and the power is about 5–800 kW at an armature voltage of 520 V. The field winding is supplied by a half-controlled two-pulse bridge B2HKF, and the microprocessor regulates the field current, so a field weakening range is available. Control and data exchange are performed by a 16-bit system, and communication is supplemented by optional PROFIBUS-DP and CANopen boards and the WinBASS program. The delivery includes fuses for semiconductor protection, line reactors and fans. The series has four sizes I–IV, with CE and UL certification.

How to choose

First determine the mode. For one direction of rotation without regeneration BKD 6 up to 2050 A is enough, while reversing and regenerative braking require BKF 12 up to 1650 A. If the existing drive is on the previous generation BKD 6/BKF 12-6000, its manual is dated 1996. For the 7000 series, manual 5.98066.07 (2006) is listed in the current documentation list of 05.2026. If a servo motor is used instead of a DC motor, look at b maXX 6500 up to 315 kW.

Request a price and lead time

BKD 6 / BKF 12 …-7000 thyristor converters for DC drives 30–2050 A, up to ≈1100 kW. We reply within one business day.

Or email office@usk.ua or call +38 (044) 339-50-20.

FAQ

How does BKD 6 differ from BKF 12?

By the power section of the armature circuit. BKD 6 is single-quadrant and rotates the motor in one direction, while BKF 12 is four-quadrant, so it reverses and returns braking energy to the mains.

What current and drive power does the 7000 series give?

BKD 6 is rated for 30–2050 A, BKF 12 for 30–1650 A. This is up to 1100 kW at 600 V armature for BKD and about 5–800 kW at 520 V for BKF.

What mains do these converters work from?

From a three-phase industrial mains with a voltage of up to 500 V.

What is used to set up the drive and what buses are available?

Setup is done in the WinBASS program, and communication with the control system is added with optional PROFIBUS-DP and CANopen boards.