Bumping this up for a update on the solution found…
We have 1st gen woodward GCP 30’s on a common sw board, 2 QSk50 cummins and the ME. Had the ME actuator decide to not play nice recently and noticed the voltage instability was pretty bad, not online during this, something I had not seen before. The cycle swing was not bad for a big ME less than .5 htz but a bad hunt. New spare actuator and all was well. It had happened during a dockside commissioning before but the focus was on the engine and not the board so I didn’t see the voltage swing. Wondering which component was the culprit for you.
MSC sent me to the GE solid state voltage regulator school in San Diego in 1984. All I can remember from the course is the breakdown voltage of a zener diode is 6 volts and the 440 volts on the bus was transformed down to 24 volts in the comparison circuit. I was on a boat in the GOM and took the switchboard cover off looking for a pot to lower the voltage on one of the generators and found a small box sealed up with no adjustment pots on it. Some of the new stuff is “throwaway junk” of the modern world. I had a voltage regulator on a shaft generator I replaced which was a simple solid state circuit card which took 15 mins to replace. The “10 turn potentiometer pot” shown in KP Chiefs picture was put on many older switchboards to gear down the voltage pot. adjustment. The old pots were super sensitive and an rch movement would raise or lower the voltage a lot. The 10 turn pot would take 10 revolutions to move the original pot one turn thus reducing large voltage swings. KP Chief was right about load sharing amperage adjustment
A friend glanced over my shoulder and saw the title of this thread out of the corner of his eye. He did a double take and said “Things are getting pretty smutty on gCaptain these days, aren’t they?” Some sailors just never grow up…
[QUOTE=Bloodyshitcakes;132630]How could this be??! He is a kings pointer!!
Omgwtflolololol!![/QUOTE]
Hey Mr. B.S. Cakes,
Good one. Sometimes we all need a little audio visual aid so here is one that might help you understand the technical issue in this thread:
To loadshare kvar or curent goes back to proper avr voltage control. From the descriptions, you have a manual voltage trim pot wired to the avr which is adjustable each time you parallel the engines. Then you need at best a lockable multi turn pot to minimise.drift.
Unless the system is wired with easygen providing a trim signal to avr for kvar sharing? This you may need to look at signal resolution, kvar sharing pid settings. Bad settings or design results in kvar swinging between generators.
Alternatively, if you want to ditch manual trim or auto kvar sharing from easygen. You can try old school cross current compensation wiring config on avr. We ve converted many system to CCC just so kvar sharing is rock solid.
Btw, is the avr analog or digital? If you are using easygen, i would imagine some money was also splash on a digital avr? I hate analog avr for the fact too many people loves to tamper with the trim pots.
[QUOTE=joo;134855]To loadshare kvar or curent goes back to proper avr voltage control. From the descriptions, you have a manual voltage trim pot wired to the avr which is adjustable each time you parallel the engines. Then you need at best a lockable multi turn pot to minimise.drift.
Unless the system is wired with easygen providing a trim signal to avr for kvar sharing? This you may need to look at signal resolution, kvar sharing pid settings. Bad settings or design results in kvar swinging between generators.
Alternatively, if you want to ditch manual trim or auto kvar sharing from easygen. You can try old school cross current compensation wiring config on avr. We ve converted many system to CCC just so kvar sharing is rock solid.
Btw, is the avr analog or digital? If you are using easygen, i would imagine some money was also splash on a digital avr? I hate analog avr for the fact too many people loves to tamper with the trim pots.[/QUOTE]
It sounds like everyone is trying to solve real issues here but since I work in the bridge I was hoping to have some double entendre in the porn direction with this “Load sharing issue” that seems to be such a problem for you folks in the engine room. I shouldn’t have to remind you that you are sailors…