Lust CDA3000 - 74 IR-Ixr Load Compensation

Application Manual CDA3000
6-13
6 Control modes
1
2
3
4
5
6
A
DE
EN
FR
6.1.2 _74 IR-IxR load
compensation
Figure 6.6 IxR load compensation block diagram
IxR load compensation is implemented by shifting the V/F characteristic
by a voltage amount ∆Υ dependent on the active current. The V/F charac-
teristic is determined by the parameters from subject area _70VF Voltage
Frequency Control.
Function Effect
• Automatic adaptation of the
V/F characteristic to the load
situation
• Compensation for voltage
drop on motor stator resistor
• In case of load surges a
higher torque is available
• The motor heats up less
under load
~
~
=
M
3~
Load
calculation
U
f
Reference [Hz]
VFC
U[v]
U[v]
Mains
i
sa
i
sb
i
sc
-