Excitation Characteristic - Lenze 4800 Manual

Show/Hide Bookmarks
Code Code Name Name
[C198*] Enable
actual
speed filter
C199* Time
constant
act. speed
filter
Stop!
Another time constant in the speed control circuit can lead to instability of the
drive!
7.6.6

Excitation characteristic

In basic configuration, the DC controller uses an internally stored excitation
characteristic to detect armature current set-values and to adpat the control
parameters of the field current controller in field weakening operation.
The influence of the internal excitation characteristic can be switched off via code
C235. If this is the case, the further control process is based on operation with
rated excitation (F
adaptation of the control parameters for the field current controller are adjusted.
The external selection of the excitation characteristic is possible by assigning an
analog signal source using codes C145/C146.
FIG 7-55
Code Code Name Name
[C235*] Excitation
characteristic
Possible settings
Lenze Selection
0 -0- Filter not active
-1- Filter active
10ms 8ms {1ms}
) i.e. neither the gain of the armature control circuit nor the
rated
C 2 3 5
0
I
F a c t
1
1 0 0 % ( o f f )
I n p u t
C 1 4 6 / C 1 4 7
C h a n g e o v e r
f o r e x t . e x c i t a t i o n
c h a r a c t e r i s t i c
Signal-flow chart (section) for the selection of the excitation characteristic
Possible settings
Lenze Selection
0 -0- internal excitation characteristic active
-1- internal excitation characteristic not active
Info
100ms
M i n %
s e t
o f M
m a x
C 0 5 6
C 3 1 0
C 3 1 1
d e p e n d e n t
C 3 1 2
C 3 1 3
C 3 1 4
I
I - c o n t r o l l e r
F
a d a p t a t i o n
C 0 6 3
o f c t r l . p a r a m e t e r s
I
m a x
C 0 2 2 / C 0 2 3
Info
With C235= -1-, the control process is
based on operation with rated excitation.
Configuration
S p e e d
c u r r e n t
l i m i t a t i o n
s e t
4900Str082
48XX/49XXSHB0399
7-95