chuzkin
Junior Member level 2
Dear friends.
Today I made a terrible mistake. I connected a SIEMENS MICROMASTER 440 220VAC input to 440VAC. After some seconds, smoke appears and I cut the circuit braker. Then, I change power supply to 220VAC (correct) and when turn on the braker, something blew up inside the VFD.
I checked inside and it seems it was just 1 of the 3 input (line) varistor S20 K275. All the other boards look fine. I will change varistor. Capacitors look fine (how can I test them?), and rectifier diodes are ok.
Do you think varistor can be the only damaged component?
What else should I check, and how to test?
Thanks a lot.
Best regards.
Today I made a terrible mistake. I connected a SIEMENS MICROMASTER 440 220VAC input to 440VAC. After some seconds, smoke appears and I cut the circuit braker. Then, I change power supply to 220VAC (correct) and when turn on the braker, something blew up inside the VFD.
I checked inside and it seems it was just 1 of the 3 input (line) varistor S20 K275. All the other boards look fine. I will change varistor. Capacitors look fine (how can I test them?), and rectifier diodes are ok.
Do you think varistor can be the only damaged component?
What else should I check, and how to test?
Thanks a lot.
Best regards.