ABB ACS800-104

Introduction to this manual
13
Terms and abbreviations
Term/
Abbreviation
Explanation
CMF Common mode filtering.
DDCS Distributed Drives Communication System; a protocol used in optical fibre
communication inside and between ABB drives.
Drive unit See Inverter unit.
DSU Diode supply unit (consisting of one or more diode supply modules).
DTC Direct Torque Control.
EMC Electromagnetic Compatibility.
Frame (size) Relates to the construction type of the component in question. For example,
several supply modules with different nominal powers may have the same basic
construction. The term is often used in reference to a group of components that
share a similar mechanical construction.
To determine the frame size of a component, refer to the rating tables in chapter
Technical data.
IGBT Insulated Gate Bipolar Transistor; a voltage-controlled semiconductor type widely
used in inverters due to their easy controllability and high switching frequency.
Inverter unit An entity containing all inverter modules controlling a motor, together with their
control electronics, and I/O and auxiliary components.
I/O Input/Output.
NDBU or
ADBU
Types of optical branching unit for fibre links that use the DDCS protocol.
NGPS or
AGPS
Gate driver Power Supply board. An optional board within inverter modules used to
implement the Prevention of Unexpected Start function.
NPBU or
APBU
Types of optical branching unit used for connecting parallel-connected inverter
modules to the RDCU.
PLC Programmable Logic Controller.
PPCS Power Plate Communication System; a protocol used in the optical fibre link that
controls the output semiconductors of an inverter module.
RDCU Drive control unit. The RDCU is a separate unit consisting of an RMIO board built
in a plastic housing. Module sizes R2i to R5i have the RMIO board built-in.
RFI Radio-Frequency Interference.
RMIO Motor control and I/O board. Contains the principal inputs and outputs of the drive.
Module sizes R2i to R5i have the RMIO board built-in; with larger units, the RMIO
is contained within a separate RDCU drive control unit.
THD Total Harmonic Distortion