Operating Instructions ACTIVE 06/07172
172 Operating Instructions ACTIVE 06/07
Behavior in generator operation:
If the current set via parameter
Current Limit 613 is exceeded, the activated current
limit controller will increase the output frequency until the current limit is no longer
exceeded. The output frequency is increased, as a maximum, to the set
Maximum
Frequency
419. If the current is below the Current Limit
613, the output frequency
is reduced to the required reference value again.
Parameter Settings
No. Description Min. Max. Fact. sett.
613 Current Limit 0.0 A o ⋅ I
FIN
o ⋅ I
FIN
614 Frequency Limit 0.00 Hz 999.99 Hz 0.00 Hz
The control behavior of the current limit controller can be set via the proportional
component, parameter
Amplification 611, and the integrating component, parameter
Integral Time
612. If an optimization of the controller parameters is necessary in
exceptional cases, a setting should be done by changing parameter
Current Limit
613abruptly.
Parameter Settings
No. Description Min. Max. Fact. sett.
611 Amplification 0.01 30.00 1.00
612 Integral Time 1 ms 10000 ms 24 ms
Note: The dynamics of the current limit value controller and the voltage control-
ler is influenced by the setting of the parameter
Dyn. Voltage Pre-Control
605.
16.5 Functions of Field-Orientated Control
The field-orientated control modes are based on a cascade control and the calculation
of a complex machine model. In the course of the guided commissioning, a map of
the connected machine is produced by the parameter identification and transferred to
various parameters. Some of these parameters are visible and can be optimized for
various operating points.
16.5.1 Current Controller
The inner control loop of the field-orientated control consists of two current control-
lers. The field-orientated control thus impresses the motor current into the machine
via two components to be controlled.
This is done by:
− controlling the flux-forming current value I
sd
− controlling the torque-forming current value I
sq
By separate controlling of these two parameters, a decoupling of the system equiva-
lent to an externally excited direct current machine is achieved.
The set-up of the two current controllers is identical and enables joint setting of am-
plification as well as the integral time for both controllers. For this, the parameters
Amplification 700 and Integral Time 701 are available. The proportional and integra-
tion component of the current controllers can be switched off by setting the parame-
ters to zero.
Parameter Settings
No. Description Min. Max. Fact. sett.
700 Amplification 0.00 8.00 0.13
701 Integral Time 0.00 ms 10.00 ms 10.00 ms
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