20 Introduction to the manual
Terms and abbreviations
Term/Abbreviation Explanation
AGDR Gate driver control board (interface to IGBTs)
AINT Main Circuit Interface Board
AMC Application and Motor Controller Board. Part of the NDCU Drive Control Unit
APBU Optical branching unit for fiber links that use the PPCS protocol. The unit is used for
connecting parallel-connected inverter modules to the RDCU/NDCU.
APOW Power Supply Board
Auxiliary control
cubicle (ACU)
The cubicle with auxiliary devices such as auxiliary voltage circuit breakers, control
electronics, measurement boards, etc.
DC (brake) chopper Conducts the surplus energy from the intermediate circuit of the converter to the
DC (brake) resistor when necessary. The chopper operates when the DC link
voltage exceeds certain maximum limit. The voltage rise is typically caused by
deceleration (braking) of a high inertia generator. DC chopper type ABRU is used in
ACS800-67LC.
DC (brake) resistor Dissipates the converter surplus braking energy conducted by the DC chopper to
heat. Essential part of the chopper circuit. See DC (brake) chopper.
Converter Converts electric power from one form to another.
Cubicle One section of a cabinet-installed wind turbine converter. A cubicle is typically
behind a door of its own.
Crowbar Conducts the surplus energy from the rotor circuit of the converter to the resistor
when necessary. The crowbar operates when the DC link voltage or rotor circuit
current exceeds certain maximum limit. The voltage rise is typically caused by grid
failures like voltage dips (sags). Crowbar type ACBU is used in ACS800-67LC.
DC link DC circuit between grid-side converter and rotor-side converter
DC link capacitors Energy storage which stabilizes the intermediate circuit DC voltage.
DDCS Distributed Drives Communication System. Communication protocol used with fiber
optic link.
DTC Direct Torque Control
EMC Electromagnetic Compatibility
Frame (size) Refers to power modules that share a similar mechanical construction, for example:
• converter or converter/inverter modules of frame R8i
• frame 2×R8i + 1×R8i includes two size R8i inverter modules and one size R8i
supply module.
To determine the frame size of a component, refer to the rating tables in chapter
Technical data.
Grid-side converter A converter that is connected to the power supply network (grid) and is capable of
transferring energy from the converter DC link to the grid and vice versa. The grid-
side converter is also called ISU.
IGBT Insulated gate bipolar transistor
IGBT supply module Bidirectional IGBT bridge and related components enclosed inside a metal frame or
enclosure. Intended for cabinet installation. Used as the supply module in
regenerative and low-harmonic converters.
IGBT supply unit
(ISU)
Grid-side converter unit. Consists of the converter module and the related
accessories (such as fuses, switches, control unit, etc.). See IGBT supply module.
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