Open-loop (OL)
Open-loop describes the open-loop-controlled operation of asynchronous
motors at frequency converters in V/Hz [U/f] operation without encoder at the
motor. This is the simplest operation of asynchronous motors.
Optional module
By means of optional modules, configurable control sections are equipped
with various functions. For example, there are optional modules for master
communications (e.g., SERCOS), encoder evaluations, I/O extensions, safety
technologies, control panels and storage media.
Optional slot
Slot in the control section into which an optional module can be plugged. On‐
ly configurable control sections have optional slots.
PELV
"Protectiv Extra Low Voltage" circuits provide protection against electric
shock and according to standard must comply with specific requirements.
Among other things, live parts and exposed conductive parts of PELV circuits
must be separated from the primary circuit by means of double or reinforced
insulation.
Power section
The power section is a separate component which contains all the important
power elements of the drive controller. Power section and control section
form a drive controller.
SCCR
Short Circuit Current Ratio
SMPS
Switched Mode Power Supply
Supply unit
Device which provides power supply to drive controllers. For disconnection
from the supply mains, it often contains a mains contactor or provides the sig‐
nals required to control an external mains contactor.
Third-party supply unit
Supply units which do not belong to the "Rexroth IndraDrive" product range.
UPS
An uninterruptible power supply is used to ensure the supply of electric loads
in the case of disturbances in the power network.
V/Hz [U/f] operation
Operation in which the drive controller generates variable voltage and fre‐
quency in order to set the speed of three-phase a.c. motors, for example.
Bosch Rexroth AG
DOK-INDRV*-SYSTEM*****-PR06-EN-P
Rexroth IndraDrive Drive Systems with HMV01/02 HMS01/02, HMD01, HCS02/03
300/309
Glossary, Definitions of Terms, Abbreviations
