6-6
Application Manual CDA3000
6 Control modes
6.1 Voltage Fre-
quency Control
(VFC)
The multiplicity of functions of Voltage Frequency Control does not permit
unrestricted simultaneous usage. However, in many cases it is possible to
sequence functions such as DC braking followed by DC holding.
Combination of voltage frequency control functions
1st active function →
Activate 2nd function ↓
Remagnetization
Current injection
IxR load compensation
Slip compensation
Current-controlled startup
DC braking
DC holding
Remagnetization
Current injection
IxR load compensation
Slip compensation
Current-controlled startup
DC braking
DC holding
Simultaneous combination not possible
Simultaneous combination possible without restriction
Simultaneous combination possible only with restrictions:
In a fixed frequency range both functions may overlap and thus restrict simultane-
ous working.
II: Current injection; IR: IxR load compensation; SL: Slip compensation
CIFMx: Limit frequency of current injection
Figure 6.2 Combination of voltage frequency control functions
0
100
[%]
II IR + SL
t [ms]
CIFMx
(CIFMx + CIFRx)
CIFRx
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