Hi all.
First time post for me
I’m after some help
I am trying to repair a high frequency 3000w inverter.
It worked great for 3 weeks when I got it (after replacing 2 IGBT’s)
But then they blew and many more replacements
I bought a new spwm board from the manufacturer and a complete new set of IGBT’s along with their associated resistors and diode.
Installed. And nothing. Bout 10 seconds in and one of the h bridge drivers exploded.
So I ordered an EGS002 board from amazon. All pinouts exactly the same. Same chips as the spwm from the manufacturer only a third the price.
I have installed this and tested all components around it including the IGBT’s. They are all good.
The IGBT’s are getting a steady 390vdc
The spwm getting a steady 5v and 12v
But I can’t get an output. I can hear the transformers buzz for 3 seconds then stop I get a blip of up to 8vac at the output.
The spwm board flashes out the code for under voltage and over current. I don’t have a current detection device fitted as it didn’t have one from the factory.
Where do I go from here? I don’t own a scope. Only a ddm.
Thanks in advance
First time post for me
I’m after some help
I am trying to repair a high frequency 3000w inverter.
It worked great for 3 weeks when I got it (after replacing 2 IGBT’s)
But then they blew and many more replacements
I bought a new spwm board from the manufacturer and a complete new set of IGBT’s along with their associated resistors and diode.
Installed. And nothing. Bout 10 seconds in and one of the h bridge drivers exploded.
So I ordered an EGS002 board from amazon. All pinouts exactly the same. Same chips as the spwm from the manufacturer only a third the price.
I have installed this and tested all components around it including the IGBT’s. They are all good.
The IGBT’s are getting a steady 390vdc
The spwm getting a steady 5v and 12v
But I can’t get an output. I can hear the transformers buzz for 3 seconds then stop I get a blip of up to 8vac at the output.
The spwm board flashes out the code for under voltage and over current. I don’t have a current detection device fitted as it didn’t have one from the factory.
Where do I go from here? I don’t own a scope. Only a ddm.
Thanks in advance
