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Sounds like unit A may have a bad controller if adjusting Stability & Gain don't do anything. The VAC across terminals A & B on the controller should be ~176 VAC, or approximately 254 Hz (3050 rpm) at no load when adjusted properly. Correct, my controllers have no adjustments. Just install...

K12 LED on indicates the 831's fault system detected a fault and removed power from the Governor Controller and hence the actuator resulting in low RPM. Without power to the actuator the voltage at H-J will be 0 VDC. Resetting the power switch clears the fault restoring power to the Governor...

When it's at a low RPM and won't respond to a STOP is the LED in the K12 relay illuminated? When illuminated it indicates there is a Fault and power has been removed from the A5 Governor Controller. When this happens using the E-Stop or Run/STOP switch will have no affect on shutting down the...

I assume when you measured ~202 Hz was the engine RPM much lower? When it stops responding to STOP is the engine RPM kinda low or still at a high RPM? Are there any Fault lights on when it stops responding to STOP? The Low Fuel fault is normally due to the fuel tank being virtually empty (or...

I'd suggest disconnecting terminals F & G from the Governor Controllers. This removes power from the governor controller. Be sure they do not touch each other or anything else. Lift the actuator arm off the magnet. Start the generator and see what Hz/RPM reading you get. If you have a high RPM...

As of now it can be found here: http://www.steelsoldiers.com/showthread.php?162301-MEP-831A-simple-Governor-setup-and-adjustment-instructions