BONFIGLIOLI active Applications Manual

06/05 21
06/05 21
The torque-forming current available in the acceleration phase is a function of the
rated current and the torque of the asynchronous machine resulting from it.
t
f
R
3 f
R
F
M
I
sq
stator frequency F
M
2 f
R
torque-forming current I
sq
If the parameter
Operation mode LE 822 is set to 3 or 4, the additional current for
the acceleration is taken into account. In this, the limit current is the effective value o
f
the stator current which can be set for a short time during the set maximum accelera-
tion. As the deceleration is regarded as being particularly critical, the set
D
eceleration
Anti-clockwise
423 is taken into account here.
5.2 Load detection for luffing jib cranes
The function for load detection for hoist applications activated by the parameter Op-
eration mode LS
822. In the factory setting, the Load Estimate (LE) operating mode is
set to zero, i.e. switched off. To activate the load detection for hoist application, op-
eration mode 1 or 3 must be selected.
Operation mode Function
1 -
Load estimate hoist appli-
cation
The permitted maximum frequency will be adjusted
by the detected load and the
Current Limit 818.
The current after the acceleration will be ob-
served.
2 -
Load estimate luffing jib
crane
Like 1 to start with. Then modification of the per-
mitted maximum frequency, with the result that the
adjustable maximum torque-forming reference cur-
rents of the parameters 819, 820 and 821 are
complied with.
3 -
Load estimate hoist appli-
cation
The permitted maximum frequency will be adjusted
by the detected load and the
Current Limit 818.
The current during the acceleration will be ob-
served.
4 -Load estimate luffing jib
Like 3 to start with. Then modification of the per-
mitted maximum frequency, with the result that the
adjustable maximum torque-forming reference cur-
rents of the parameters 819, 820 and 821 are
complied with.
For the load estimate, the
Mechanical time constant 811 and the system constant
Turns per meter 812 must be known. With the help of these parameter figures, the
load estimate calculates the sum of the loads in the liftin
g application (load of the
luffing jib and load on the hook) during the acceleration. They are related to the rated
torque of the machine and displayed as a percentage by the actual value
Load Esti-
mate
243.
In the basic speed area, the current load and the torque relative to the rated torque
are additionally displayed by the actual figure
Load 242. The permitted maximum
speed is determined from the estimated load.

BONFIGLIOLI active Specifications

General

Brand	BONFIGLIOLI
Model	active
Category	DC Drives
Language	English