Application Manual CDA3000
A-29
Appendix C Glossary
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A
DE
EN
FR
Reference input
variable
Variable not influenced by the control which is fed
into the control circuit from the outside. The output
variable of the control follows the reference input
variable in mathematical dependency. The current
value of the reference input variable is termed the
reference.
Reluctance motor Asynchronous motor which, due to its design, runs
asynchronous in the startup phase and which,
based on its strong pole formation, declines into
synchronism in stationary operation.
Remagnetization Increase in startup and standstill torque by means
of magnetic flux build-up prior to starting of the drive
RS232 Recommended Standard 232; standardized serial
interface for one terminal with max. 15 m line
length.
RS485 Recommended Standard 485; standardized serial
interface for max. 240 terminals and 1000 m line
length.
Sampling time Time for all instructions of the inverter software to
be processed.
SFC S
ensorless Flux Control, control method in which
the rotor speed and the current angle of the rotor
are determined without encoder by way of the elec-
trical variables. The voltage pointers are placed
dependent on the calculated information to form the
torque from the current. Good dynamics and
smooth running, also high torque formation.
Slip Determines the rotor frequency f
L
of the asynchro-
nous motor. As the load increases the slip s
becomes greater and the speed decreases.
Slip defined in rpm or as % of field speed n
F
Slip
compensation
Compensates for load-dependent speed changes of
a drive. As load increases the compensation pro-
vides an increase in output voltage and frequency,
and reduces output voltage and frequency as the
load is relieved.
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