KFU 2-/4-
220
17.6 V-belt
Monitoring
Continuous monitoring of the load behavior and thus of the connection between the
3-phase machine and the load is the task of the V-belt monitoring system. The pa-
rameter
Operation mode
581
defines the function behavior if the
Active current
214
(sensorless control) or the torque-forming current component
Isq
216
(field-oriented
control method) is below the set
Trigger limit Iactive
582
for longer than the param-
eterized
Delay time
583
.
Operation mode
581
Function
0
-
Off
The function is deactivated.
1
-
Warning
If the active current drops below the threshold value,
the warning "A8000" is displayed.
2
-
Error
The unloaded drive is switched off and fault message
"F0402" is displayed.
The error and warning messages can be read out by means of the digital outputs
(signal 22 - “Warning V-Belt”) or reported to an overriding control system. The
Trigger
limit Iactive
582
is to be parameterized as a percentage of the
Rated current
371
for
the application and the possible operating points.
Parameter
Settings
No.
Description
Min.
Max.
Fact. sett.
582 Trigger limit Iactive
0.1 %
100.0 %
10.0 %
583 Delay time
0.1 s
600.0 s
10.0 s
17.7
Functions of Field-Orientated Control
The field-orientated control systems are based on a cascade control and the calcula-
tion of a complex machine model. The various control functions can be supplemented
by special functions specific to the application.
17.7.1 Motor
Chopper
The field-orientated control systems contain the function for adapted implementation
of the generator energy into heat in the connected three-phase machine. This en-
ables the realization of dynamic speed changes at minimum system costs. The
torque and speed behavior of the drive system is not influenced by the parameterized
braking behavior. The parameter
Trigger threshold
507
of the DC link voltage defines
the switch-on threshold of the motor chopper function.
Parameter
Settings
No. Description
KFU
Min. Max.
Fact.
sett..
2- 225
385
506
Trigger
threshold
4- 425
1000.0 V
770
