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SubBrand name 'Exmork', 5 Kw Sine wave inverter Intermittently, breaks into a spurious mode which causes it to draw excessive current while the output waveform becomes seriously corrupted with severe transient spikes close to the crossover point. We have available oscilloscope images showing the problem graphically. We have four of these inverters out in the field, and they all exhibit the problem from time to time. The fault has precipitated failures in the Power-board module in two units

Answers :

Had similar problems with my inverters a while back tried to sort it out myself all to no avail. Eventually found out it was a problem from the manufacturers and all that were produced had the same fault. Had to change my brand to Su-Kam inverters. If all four of your units have the same problems then the problem is from the manufacturers if your warranty is still valid return them otherwise you are stuck with them. Sorry for any inconvenience.
Hope this solution has been helpful?

I dont have schematics for this particular inverter.

The problem is in the oscillators section of the inverter, likely one of the oscillators. Since the problem goes out disconnecting power, the components located before the oscillators in the final stage of the inverter must also be tested. A faulty capacitor may also result in this problem.

As said, the problem is more likely one of the oscillator. The oscillator is defective and goes slowly out of phase. After a while this will result in a corrupted wave form. When you disconnect and re-apply power the problem re-occurs only after a while, when the oscillator starts going out of phase again.

As said a faulty component may also cause the problem.


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