Fin - BONFIGLIOLI ACTIVE Applications Manual

During the lowering of the luffing jib, the machine works as a generator. Thanks to the
properties of the machine, the frequency inverter and the mechanics, the effective
value of the current is distinctly lower than in lifting, in particular in the field weaken-
ing area, with the same speed and load. If the speed is additionally increased, this
leads to a further reduction of the current.
Two further parameters, with which the reference value for the torque-forming current
Isq is stated in the lowering of the luffing jib arm, have been created for these opera-
tion points for the synchronization of the permitted maximum speed.
With the parameter
tion points with rated frequency.
With the parameter
set with the parameter
The reference value used for the calculation is subjected to linear interpolation within
these frequency limits.
The permitted maximum speed is displayed in the above illustration with the negative
speed in an anti-clockwise direction.
It can clearly be seen that the torque-forming current increases as the absolute value
of the speed decreases.
No.
820 Desired Isq down at FsR
821 Desired Isq down at Fmax
24
24
Desired Isq down at FsR
Desired Isq down at Fmax
Maximum Frequency
10,0
permitted maximum speed
7,5
5,0
2,5
0,0
-2,5
-5,0
-7,5
-10,0
00:30 00:36 00:42
Parameter
Description
820 the current is specified in the opera-
821 the current at the frequency limit
419 is specified.
I
sd
00:48 00:54 01:00 01:06
Min.
0.01 ⋅ I
0.01 ⋅ I
I
sq
actual speed
01:12 01:18 01:24
Setting
Max. Fact. sett.
o ⋅ I 0.80 ⋅ I

FIN

FIN
o ⋅ I 0.55 ⋅ I
FIN FIN
01:30
min:s
FIN
FIN
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