Which products are affected?
9300 vector 0.37…90 kW SW V7.1
Applications
Applications in which a speed-dependent adaptation of the integral action time of the current controller is required in order to achieve an oscillation-free current control over the complete speed range.
Function description
The integral action time of the current controller is set under code C0076. By means of code C0079 it is possible to adapt the integral action time of the current controller as a function of the speed.
The setting reserve of the current controller is limited to the maximum possible output voltage of the drive controller (mains voltage minus losses).
Related to the output voltage (voltage-frequency characteristic of the motor) dependent on the rotating field frequency the setting reserve is high when the speeds are low (low motor voltage) and decreases linear with the speed.
As a result, the integral action time for an oscillation-free current control in the lower speed range can be selected smaller than the one in the upper speed range.
By adapting the integral action time to the speed setpoint the current control can be adapted for the complete speed range.
By means of code C0079 the adaptation of the integral action time of the current controller can be set from 10 % - 100 %.
According to the Lenze setting C0079 is 100 %, i. e. an adaptation is not made.
The integral action time resulting from the adaptation is calculated as follows:
Integral action time of the current controller resulting from the adaptation = C0076 * Tn Adapt
Tn Adapt = ((100% - C0079) / (Rated motor speed of C0011 in % )) * (Setpoint speed of C0011 in % ) + C0079
Above the rated speed Tn Adapt is not changed any further.
