Brandon314159
Member
- 37
- 1
- 8
- Location
- Portland, OR
Well >10 years later, finally circling back to this generator as I have some renewed use for it.
I left it with 6 new rectifiers installed but clear evidence of burnt wires on the exciter rotor.
I pulled the end bell off last week and started repairs. Found that just the 3 cables running between the diodes and the output windings of the exciter rotor were melted and shorted together. Cut and repaired those wires. Re-laced windings and coated everything with clear insulation enamel. Re-assembled this weekend for testing.
Left the 12 leads disconnected, and hooked up a 30V 4A variable power supply to F1/F2 so I can see what sort of current I'm pulling.
The news was grim. At 1800rpm, it took over 4A just to get ~110V across one single winding. Should be closer to 1.35A. I shut things down and started digging. I thought that I did a resistance check between the main rotor winding leads and the case, but apparently I did not. <0.5ohms. Doesn't appear to be a flying short, just a short to the shaft. Womp.
So now I'm on the hunt for a main rotor/exciter rotor combo (assuming they'll be stuck together as seem like a bear to press apart) or I get to see what the local rewind shop would charge for a wind. Bummer!
If anyone has leads on a parts MEP006 gen end, please reach out!
I have a woodward governor, basler controller, and a modern AVR to throw at this gen as soon as I can get the gen head back up to snuff.
I'll update as I go.
Thanks!
I left it with 6 new rectifiers installed but clear evidence of burnt wires on the exciter rotor.
I pulled the end bell off last week and started repairs. Found that just the 3 cables running between the diodes and the output windings of the exciter rotor were melted and shorted together. Cut and repaired those wires. Re-laced windings and coated everything with clear insulation enamel. Re-assembled this weekend for testing.
Left the 12 leads disconnected, and hooked up a 30V 4A variable power supply to F1/F2 so I can see what sort of current I'm pulling.
The news was grim. At 1800rpm, it took over 4A just to get ~110V across one single winding. Should be closer to 1.35A. I shut things down and started digging. I thought that I did a resistance check between the main rotor winding leads and the case, but apparently I did not. <0.5ohms. Doesn't appear to be a flying short, just a short to the shaft. Womp.
So now I'm on the hunt for a main rotor/exciter rotor combo (assuming they'll be stuck together as seem like a bear to press apart) or I get to see what the local rewind shop would charge for a wind. Bummer!
If anyone has leads on a parts MEP006 gen end, please reach out!
I have a woodward governor, basler controller, and a modern AVR to throw at this gen as soon as I can get the gen head back up to snuff.
I'll update as I go.
Thanks!