Setting up Compax3 C3I12T11100 192-120113 N08 C3I12T11 - December 20104.1.4. Optimize motor reference point and switching frequency ofthe motor currentThe motor reference point is defined by the reference current and the reference(rotational) speed.Standard settings are: Reference current = nominal current Reference (rotational) speed = nominal (rotational) speedThese settings are suitable for most cases.The motors can, however, be operated with different reference points for specialapplications. By reducing the reference (rotational) speed, the reference current can beincreased. This results in more torque with a reduced speed. For applications where the reference current is only required cyclically with longenough breaks in between, you may use a reference current higher than I 0 . Thelimit value is however reference current = max. 1.33*I 0 . The reference (rotational)speed must also be reduced.The possible settings or limits result from the respective motor characteristics.Caution!Wrong reference values (too high) can cause the motor to switch off duringoperation (because of too high temperature) or even cause damage to the motor.The switching frequency of the power output stage is preset to optimize theoperation of most motors.It may, however, be useful to increase the switching frequency especially withdirect drives in order to reduce the noise of the motors. Please note that the poweroutput stage must be operated with reduced nominal currents in the case ofincreased switching frequencies.The switching frequency may only be increased.Caution!By increasing the motor current switching frequency, the nominal current and thepeak current are reduced.This must already be observed in the planning stage of the plant!The preset motor current switching frequency depends on the performance variantof the Compax3 device.The respective Compax3 devices can be set as follows:Optimization of themotor referencepointOptimization of theswitching frequency
