30-A power supply module: noticeable noise, humming or crackling sounds (no correction planned)
Corrected from: Power supply module (30A) of i700 servo inverter (no correction planned)
Response of the new version: No hardware modifictaions are planned, because the noise arising under certain conditions is not critical for the functionality and the operational safety of the drive system.
What happens? The small 30-A i700 power supply modules generate humming or crackling noises.
The noise is caused by a temporary current rise in the ferrite core of the filter choke at the mains input. With the bigger 60-A i700 power supply modules, this behaviour has not been observed. The filter design of the two devices is different.
When does this behaviour occur? The behaviour mainly occurs if the switching frequency of the connected i700 axis modules is set to 4 kHz and the axis modules are enabled. If the switching frequency is set to 8 kHz, noise generation is barely perceptible.
Which products are affected? Power supply module (30A) of i700 servo inverter
Short-term measures: None.
Evaluation/recommendations: The noise does not have any negative effects on the operational safety or the reliability of the devices. It cannot be heard outside the control cabinet provided that the control cabinet doors are closed.
