Lenze ESMD302L4TXA VFD defect

[gaminn]

Hi,
I got two ESMD302L4TXA inverters and both are not able to drive my motor: https://youtu.be/WpKo30suBRI The motor doesn't run smoothly and produces a lot of noise. It is like the motor starts and stop several times per second.

The motor runs smoothly on every other VFD I ever had connected to it.

Is there any setting in this inverter that will fix it or are both inverters bad? Any idea how to fix it? I noticed both inverters have its plastic enclosure discoloured (brown or yellow) mainly in the areas that are in contact with aluminium heatsink so I'm afraid both VFDs experienced some overheating.

[paulvos]

Not really familiar with Lenze drives, but according to the Type number this model has optional modbus control. You should check parameter C01 , to see if it's really in local terminal control mode ( should be set to 1 according to manual https://www.nexinstrument.com/assets/images/pdf/Manual-SMD-V20-0-GB-2016_12.pdf ).

Could also be electrical problem, maybe the input bridge fried. Happens when running inverters that have been stored for too long ( caps have to be reformed ). You should check connections B+ B- to see if there is a constant DC bus voltage.

During run , check these parameters for any abnormalities.

C50 Output frequency 0.0 {Hz}
C53 DC bus voltage 0.0 {%}
C54 Motor current 0.0 {%}

[gaminn]

Hi, thanks for your reply.

Here https://youtu.be/VZ2Sw_vkjVU is a video documenting C53 and C54 parameters behaviour. C53 decreases as output frequency goes higher and suddenly there is run displayed. C54 increases. I can do like 10 Hz output frequency, after that I'm afraid my motor will be damaged. Please turn sound on so you can hear what's happening. Motor is just shaking.

C50 is steady during inverter operation.