Mep 805a phase down

[jmenende]

This is a new one for me.
Got an 805a running great for a month and suddenly L1 shows 25vac. L2 and L3 have 120vac each. Anyone have this issue? Im thinking diodes.

 

[Guyfang]

That sounds about right. I would check the wiring down to the diodes first.

 

[jmenende]

After I pulled the bell end and tested the diodes with no issues I started pulling wires and found the culprit. The customer had a very unbalanced panel and it overheated l1 right in the back of the contactor where it could not be seen. When i tugged it came right out. Boy was I pissed. That bell end did not cooperate.

 

[Guyfang]

Good job!!

 

[DieselAddict]

On the plus side, that is pretty easily repaired. Glad you didn't find the problem inside the generator head.

That is a possible sign of loose connections. I'd take the time to go through and make sure EVERY terminal in the power path is nice and tight.

 

[kloppk]

That is a possible sign of loose connections. I'd take the time to go through and make sure EVERY terminal in the power path is nice and tight.

K8 should have detected an overload and opened K1. I agree with DA it may have burned up due a loose connection.

 

[2Pbfeet]

@jmenende congratulations on finding the culprit!

+1 on a loose connection or poorly made crimp. Personally, running down suspicious crimps is a personal favorite, (Not!!), but since @jmenende has one, I would be inclined to assume the worst, and check the crimping and terminal connections of all the heavy gauge wires on the possibility that whoever did the crimping or hookup didn't get the heavy gauge crimps right.

All the best,

2Pbfeet

 

[Guyfang]

Loose connection would be my first guess.