06/05 23
5.2.1 Torque-forming current Isq
The maximum permitted speed during the lifting of the luffing jib is changed in such a
way that the torque-forming current I
sq
corresponds to the figure set with parameter
Desired Isq up 819 in the field weakening area. The permitted maximum speed is a
function of the angle of the luffing jib.
min:s
00:06 00:12
00:18 00:24 00:30 00:36 00:42 00:48 00:54 01:00 01:06
10,0
7,5
5,0
2,5
0,0
-2,5
I
sq
I
sd
permitted maximum speed
actual speed
The rise of the torque-forming current I
sq
at the 6 s point in time is needed for the
acceleration.
If the value
Desired Isq up 819 is increased, the absolute current value and the
maximum permitted speed for the lifting of the luffing jib increase. If the value
De-
sired Isq up
819 is reduced, both are reduced accordingly.
The effective value of the current is composed of the vector addition of Isq and Isd. If
the effective value of the current is to be equal to the rated current during the lifting in
stationary operation, the value in parameter 819 must be input some percent smaller
than the rated current.
Parameter Setting
No. Description Min. Max. Fact. sett.
819 Desired Isq up 0.01 ⋅ I
FIN
o ⋅ I
FIN
0.8 ⋅ I
FIN
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