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Hi David I'm one of your many YT subscribers. I very much enjoy your videos! I agree with Dieseladdict. Looks like they were doing environmental stress testing on that 831. I recall seeing that set and another one during that auction.

S14 the Frequency Trip Switch has nothing to do with faults. It does do two things. Enables and disables the starter to prevent the starter from grinding when the engine is running. S14 also enables and disable the Field Flashing function.

OK, K16 gets closed to enable cranking fron S14. The leftmost item in the row of relays. Be sure you can see a small circuit board inside S14 to be sure someone didn't plug a regular relay in there. On S14 check for 24 volts DC across it's socket terminals 7 and 8 with S1 in Prime/Run. If you...

The diode is installed backwards! The stripe should be on the RIGHT. Like this...

Yes, it's at the very back of the -13&P TM

If its doing that its because K6, the Short Circuit fault relay inside the inverter is activating K12 killing power to the GC.

Check to see if there is a diode across S5 terminals 2 & 5. Verify end of diode with the stripe on it is connected to terminal 2. After starting it are there any fault lights illuminated? Test the fault lights with the test button to verify they all work.

PM sent Kurt

Did you check the 8 fuses while you had it apart? Those fuses are the input fuses for the two inverter power supplies. If any were blow an inverter wouldn't get the full AC power from the PMA. The circuit board they are on also contain about a dozen high current diodes to rectify the 3 phase...

The second picture really shows the melted plastic housing. Must have gotten awfully hot. Never seen that before. Definitely not a good sign.

Not that I recall. Can you post a picture of the discoloration?

The inverter actually has two 120 volt inverters inside of it. In 240 mode it internally connects the two inverters in series and sets them them to be 180 degrees out of phase to generate the 240. In 120 mode the two inverters inside are connected in parallel and are in phase with each other...

That's due to the OV fault signal from the inverter. You can unplug the cable from the back of the fault monitor. This will prevent it from responding to the OV fault or any other fault and keep power to the GC.

Gotta get the GC changed so the engine speeds up to support the load.

The Mecc Alte head is internally regulated via a capacitor.

That would be high humidity. Some people have had luck removing the main board from the inverter, drying it in an oven and then sealing the potentiometers to keep the moisture out. Heads to swap in need a J609B configuration. Most buy the gen head from Mecc Alte. It's a 4.2 kva head. Ive...

No schematics or trouble shooting info for the inverter. It's a pluck and chuck item. High humidity can cause issues with them. Have you had high humidity lately while you've been working with it? The rest of the generator is pretty solid. I have a supposidly good used inverter on it's way...

Sounds like the inverter is reporting an OV fault to the Fault Monitor which in turn is causing K12 to turn on. Killing power to the GC. The inverters in the 831's are trouble prone. Most people have problems with OL or SC faults.

OK that's normal.

The 147 volts indicates the GC has no power or isn't working. Should be 178 ish volts if idling properly with no load.