Greetings!
First off, I apologize if this is in the wrong subforum. In my somewhat thorough search, I couldn't find any other threads regarding these units.
I have a Dewalt DG4300 (Model #DG4300) generator, rated for 4.3 kVA, powered by a Honda GX240 engine. (It didn't seem like a complete Honda rebrand, so I was reluctant to post this in the Honda subforum.) This particular unit uses brushless excitation, with two modules on the rotor, and a separate stator winding that is connected to a heavy capacitor. One of the rotor modules (P/N: 429982-06) contains MOVs. The other module (P/N: 429982-05), the rectifier, is why I'm here.
The problem: the unit isn't producing power and the rectifier module is the problem. There is a large TO-220F package semiconductor on the module that was fatally cracked; it must be house-marked because I couldn't track down the part number. The rectifier assembly is NLA from Dewalt or elsewhere, and Dewalt wouldn't give up any sort of service manual or schematics that would enable me to build a new one. The old one was encased in an inch of solid epoxy and drilling it out didn't get me anywhere; there were two mystery components and a small PCB destroyed in the process. Given that, I can't rule out the possibility that the TO-220F device is something other than two diodes.
It appears that certain Devilbiss, and other units that employ brushless excitation, use similar parts. However, I don't have any schematics or service manuals in front of me to back that up.
Where I'm going with this:
1) Does anyone out there have a parts unit with a working rectifier module?
2) Does anyone, by chance, have any sort of schematic or service manual for this unit, or a unit that employs a similar brushless excitation scheme? If I can get an idea of what is needed on the rotor side, aside from the MOVs, I might be able to build a new module.
3) Approximately what should I be reading in terms of stator and rotor resistance? (It's a 4.3kVA unit, so a ball-park figure from another brand with a similar power rating would work.)
I'm happy to provide additional details/pictures if needed. This has been my nightmare for about a month, so any help is greatly appreciated.
First off, I apologize if this is in the wrong subforum. In my somewhat thorough search, I couldn't find any other threads regarding these units.
I have a Dewalt DG4300 (Model #DG4300) generator, rated for 4.3 kVA, powered by a Honda GX240 engine. (It didn't seem like a complete Honda rebrand, so I was reluctant to post this in the Honda subforum.) This particular unit uses brushless excitation, with two modules on the rotor, and a separate stator winding that is connected to a heavy capacitor. One of the rotor modules (P/N: 429982-06) contains MOVs. The other module (P/N: 429982-05), the rectifier, is why I'm here.
The problem: the unit isn't producing power and the rectifier module is the problem. There is a large TO-220F package semiconductor on the module that was fatally cracked; it must be house-marked because I couldn't track down the part number. The rectifier assembly is NLA from Dewalt or elsewhere, and Dewalt wouldn't give up any sort of service manual or schematics that would enable me to build a new one. The old one was encased in an inch of solid epoxy and drilling it out didn't get me anywhere; there were two mystery components and a small PCB destroyed in the process. Given that, I can't rule out the possibility that the TO-220F device is something other than two diodes.
It appears that certain Devilbiss, and other units that employ brushless excitation, use similar parts. However, I don't have any schematics or service manuals in front of me to back that up.
Where I'm going with this:
1) Does anyone out there have a parts unit with a working rectifier module?
2) Does anyone, by chance, have any sort of schematic or service manual for this unit, or a unit that employs a similar brushless excitation scheme? If I can get an idea of what is needed on the rotor side, aside from the MOVs, I might be able to build a new module.
3) Approximately what should I be reading in terms of stator and rotor resistance? (It's a 4.3kVA unit, so a ball-park figure from another brand with a similar power rating would work.)
I'm happy to provide additional details/pictures if needed. This has been my nightmare for about a month, so any help is greatly appreciated.
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