How to solve Error Code 39

Fault code:【39】Abnormal DC component of inverter voltageReason:1. Aging of control circuit componentsThe aging of operational amplifiers, A/D converters, and other components in the internal control circuit of inverters can cause zero drift, resulting in the presence of DC components in the reference sine wave, which in turn affects the output voltage waveform.  2. Differences in switch tube characteristicsThe parameters such as conduction voltage drop and turn off time of different switching devices are inconsistent, resulting in asymmetric positive and negative waveforms of PWM waves and the generation of DC components in the output AC power.  3. Feedback circuit zero driftThe zero drift of Hall sensors and A/D converters can introduce small DC components, especially when the feedback coefficient is small, which has a significant impact.   Solution:1. Replace aging componentsTest key components such as operational amplifiers and A/D converters, and replace them with devices with stable performance if necessary.  2. Optimize the matching of switch tubesSelect switch tubes with similar parameters and adjust the consistency of the driving signal to reduce the deviation of pulse width modulation wave period integration.  3. Adjust control parametersOptimize the PWM control strategy through software to reduce the impact of the DC component of the reference sine wave.Note: Please do not dismantle the machine without permission, otherwise it will be out of the warranty of Ktech.