BONFIGLIOLI active Applications Manual

06/0524
24 06/05
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-
in
g 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-formin
g 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
Desired Isq down at FsR 820 the current is specified in the opera-
tion points with rated frequency.
With the parameter
Desired Isq down at Fmax 821 the current at the frequency limit
set with the parameter
Maximum Frequency 419 is specified.
The reference value used for the calculation is subjected to linear interpolation within
these frequency limits.
min:s
00:30 00:36
00:42 00:48 00:54 01:00 01:06 01:12 01:18 01:24 01:30
10,0
7,5
5,0
2,5
0,0
-2,5
-5,0
-7,5
-10,0
permitted maximum speed
actual speed
I
sq
I
sd
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-formin
g current increases as the absolute value
of the speed decreases.
Parameter Setting
No. Description Min. Max. Fact. sett.
820 Desired Isq down at FsR 0.01 ⋅ I
FIN
o ⋅ I
FIN
0.80 ⋅ I
FIN
821 Desired Isq down at Fmax 0.01 ⋅ I
FIN
o ⋅ I
FIN
0.55 ⋅ I
FIN

BONFIGLIOLI active Specifications

General

Brand	BONFIGLIOLI
Model	active
Category	DC Drives
Language	English