First post here. Always had good luck with this forum on general questions I had about all sorts of things. Figured I would give it a shot with a problem I'm having with a Kubota diesel generator. Sorry if its the wrong section.
I have a V2203DI kubota diesel with a variable 50/60hz generator. When working correctly, they run at 50hz (1500rpm) in low load operation and 60hz (1800rpm) in high load. One of the ones I'm working on starts up at 60hz no matter what. It has a voltage controller that provides a signal to the electronic governor , when the voltage controller senses a low output voltage at a specific range, it will send 12volts to the electronic governor(EG) to speed up to 60hz. Normally if one of those are bad, it will run at 50hz no matter what because it doesn't send out that 12 volt signal to the EG. I know thats not an issue because the engine is always running at 60hz, unplugged or not. There is a engine speed sensor that sends a signal to the the EG, checked the pins on that into the EG and they have continuity, also replaced the speed sensor just to verify its working correctly, still starts up at 60hz. Switched out the EG with one from a unit that is working correctly, same problem exist.
I understand that the speed sensor signal is compared to the electronic governor set point and on most engines, it adjusts some actuator on the fuel rack to compensate for load. This engine doesn't have an actuator, just the fuel stop solenoid unless I'm missing something. That's just a plunger that retracts when it gets 12 volt signal during operation. Now, if I unplug the voltage controller, these engines run at 50hz, I know that for a fact. When I do that, that takes the generator out of the equation so it has to be an engine speed problem right?. If the speed sensor is fine, the electronic governor is fine, then it should be a mechanical governor/injection pump problem right?
Here is a photo of the pump. You see the two sensors on it. Speed sensor on the bottom and the fuel shut off solenoid to the right of it. What does an electronic governor do without an actuator?? I can only think that maybe the gap between the speed sensor and whatever its reading is more than it should be, or the governor is messed up somehow (maybe internal spring on a linkage)?
Curious, if somebody adjust the screws on the control plate, how does that effect rpm during startup and running? Will the governor compensate for that?
Sorry, for all the questions, just trying to get a grasp on how all this stuff fits together.
I have a V2203DI kubota diesel with a variable 50/60hz generator. When working correctly, they run at 50hz (1500rpm) in low load operation and 60hz (1800rpm) in high load. One of the ones I'm working on starts up at 60hz no matter what. It has a voltage controller that provides a signal to the electronic governor , when the voltage controller senses a low output voltage at a specific range, it will send 12volts to the electronic governor(EG) to speed up to 60hz. Normally if one of those are bad, it will run at 50hz no matter what because it doesn't send out that 12 volt signal to the EG. I know thats not an issue because the engine is always running at 60hz, unplugged or not. There is a engine speed sensor that sends a signal to the the EG, checked the pins on that into the EG and they have continuity, also replaced the speed sensor just to verify its working correctly, still starts up at 60hz. Switched out the EG with one from a unit that is working correctly, same problem exist.
I understand that the speed sensor signal is compared to the electronic governor set point and on most engines, it adjusts some actuator on the fuel rack to compensate for load. This engine doesn't have an actuator, just the fuel stop solenoid unless I'm missing something. That's just a plunger that retracts when it gets 12 volt signal during operation. Now, if I unplug the voltage controller, these engines run at 50hz, I know that for a fact. When I do that, that takes the generator out of the equation so it has to be an engine speed problem right?. If the speed sensor is fine, the electronic governor is fine, then it should be a mechanical governor/injection pump problem right?
Here is a photo of the pump. You see the two sensors on it. Speed sensor on the bottom and the fuel shut off solenoid to the right of it. What does an electronic governor do without an actuator?? I can only think that maybe the gap between the speed sensor and whatever its reading is more than it should be, or the governor is messed up somehow (maybe internal spring on a linkage)?
Curious, if somebody adjust the screws on the control plate, how does that effect rpm during startup and running? Will the governor compensate for that?
Sorry, for all the questions, just trying to get a grasp on how all this stuff fits together.
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