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3kw inverter repair

Stockleys

Jun 18, 2019
2
Joined
Jun 18, 2019
Messages
2
Hi all
I need some advice with regards to repairing a pure sign wave inverter

I have a new spwm. (EGS002)
4 new IGBT’s and all new associated resistors and diodes

The spwm is getting a good 5v and 12v
The IGBT’s are getting a good 380vdc

When powering on, I can hear the transformers buzzing for 3 seconds and I get a peak of 8vac from the output. After these 3 seconds, the spwm shuts down and flashes the low voltage code (not that I need it to know that 8v is far too low)

Why am I not getting 230v even tho the IGBT’s are being fed with 380vdc?

I’m really at a loss
 

Tha fios agaibh

Aug 11, 2014
2,252
Joined
Aug 11, 2014
Messages
2,252
Probably something on driver board isn't firing your gates. Perhaps ir2110s or related components. Did you check all your diodes?
 

Stockleys

Jun 18, 2019
2
Joined
Jun 18, 2019
Messages
2
I have replaced all IGBT’s diodes and resistors. Iv has 3 new spwm control boards the first wouldn’t give an output. The next 2 blew a pair of IGBT’s each.
 

veli

Mar 5, 2020
5
Joined
Mar 5, 2020
Messages
5
before connecting ur power mosfet .scoppe the gate signal.is it pure sine wave?is the right freq? is it distorted? etc.goodluck
 
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