About this manual
22
Terms and abbreviations
Term/Abbreviation Explanation
AGPS Gate driver power supply board. An optional board within drives, used to
implement the Prevention of Unexpected Start function.
APBU Type of optical branching unit used for connecting parallel-connected
converter modules to the RDCU.
CMF Common mode filtering.
DDCS Distributed Drives Communication System; a protocol used in optical fibre
communication inside and between ABB drives.
Drive unit See Motor-side converter.
EMC Electromagnetic Compatibility.
Frame (size) Relates to the construction type of the component in question. For
example, several drive types with different power ratings may have the
same basic construction, and this term is used in reference to all those
drive types.
With the ACS800-37, the frame size of the drive indicates the quantity and
frame size of the inverter modules, e.g. “2×R8i”.
To determine the frame size of a drive type, see the rating tables in the
chapter Technical data.
IGBT Insulated Gate Bipolar Transistor; a voltage-controlled semiconductor type
widely used in inverters because of their easy controllability and high
switching frequency.
IGBT supply unit (ISU) See Line-side converter.
Inverter unit (INU) See Motor-side converter.
Line-side converter A converter that is connected to the supply network and is capable of
transferring energy from the network to the DC link of the drive. With
ACS800-37 drives of frame size R7i and above, the line-side converter is
also called the (IGBT) supply unit or the ISU.
Motor-side converter A converter that is connected to the motor and controls the motor
operation. With ACS800-37 drives of frame size R7i and above, the
motor-side converter is also called the inverter unit or INU.
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.
RFI Radio-Frequency Interference.
RMIO Motor control and I/O board. Contains the principal inputs and outputs of
the drive. The RMIO is contained within the RDCU drive control unit.
THD Total Harmonic Distortion.
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