Your last generator Maintenance Run

[Patrick Herd]

OK cool, try this:

Oil pressure lamp is optional, added purely for diagnostic purposes.
You want relay common contact connected to 28V and the Normally Closed (NC) contact is connected to your pin 12 running input to the controller.

 

[90cummins]

The oil pressure switch I have has 2 terminals one is for a pressure gauge and the other is a switch to ground that opens at 30 psi so it looks like I need to use a relay to make this work????
90cummins

 

[RalphVa]

Got the oil and fuel filter at NAPA for the Isuzu this afternoon. Plan to change coolant tomorrow and then oil after running it from refilling with coolant. Got a leftover gallon of Coolgard II from JD. Got a Kubota now.

The fuel filter MIGHT be okay that I bought 9 years ago, but wasn't sure about the seal. Figure the 9 year old air filter is fine.

 

[Patrick Herd]

Edit: You will probably need to increase the run hold time a bit to allow for the oil pressure to come up.

 

[LittleBill21]

I disagree with the approach to use the oil pressure switch for this. you are removing a safety. by using the pressure switch in this fashion, how do we know if the loss of oil pressure is from mechanical failure or a shut down? by a loss of oil pressure, it allows the system to restart ( this can be disastrous if the engine is truly without oil pressure, due to mechanical failure.), the oil pressure switch should be on some kind of timer where in 5 seconds oil pressure is not achieved, safeties should engage and the system shut down.

instead of a diode, something like this can be used, as to not break the heavy gauge wiring

https://www.amazon.com/CR-Magnetics...6e1bba15cd93f&language=en_US&ref_=as_li_ss_tl

 

[90cummins]

While waiting for a revised wiring schematic I wired in a 12v relay using the oil pressure switch in the circuit, it was not happy kept showing a fault.
So just experimenting I connected the relay as follows
black #86 to ground
White #85 to fuel
Yellow #87 to run sense #12
Blue #30 to fuel
I don’t know why but I works as it should. Started & stopped it several times worked perfect.
I manually started it with the key and the SCP controller detected it was started with the switch.
Thoughts!!
90cummins

 

[90cummins]

Note; red wire was not used.
90cummins

 

[LittleBill21]

although I have no idea how "fuel" is wired, you pretty much bypassed the generator running check. its simply basing the signal on the fuel pump control, not whether the generator is running or not.

your also confusing by saying 12v relay? do you mean 24?

 

[90cummins]

Feeling like I won the lottery!!
So I thought it would be a good idea to see it would operate properly in the auto mode.
I programmed it to start at 25.5 volts and shutdown at 28 volts.
I plugged in a 1500 watt heater & watched the voltage drop to 25.5 volts & 30 seconds later it started & when the voltage hit 28v it shut down.
I’m not done but I have a system that now works as I envisioned.
I need to redo the wiring so it looks more presentable.
The oil pressure switch needs to be connected to protect the engine then I’ll have some peace of mind.
Having the forum’s experts for guidance & encouragement certainly gave me that push I needed to get to this point.

Thank you!!
90cummins

 

[90cummins]

although I have no idea how "fuel" is wired, you pretty much bypassed the generator running check. its simply basing the signal on the fuel pump control, not whether the generator is running or not.

your also confusing by saying 12v relay? do you mean 24?

The fuel solenoid is 12v so I needed to use a 12v relay for the run signal. You are correct the controls do not know if the engine is running that is something we need to pursue fortunately the Yanmar starts like a first gen Cummins 1 turn & it’s running when it’s warm out. The oil pressure switch will be added later.
At least I have a system that works!
90cummins

 

[90cummins]

Edit: You will probably need to increase the run hold time a bit to allow for the oil pressure to come up.
View attachment 751842

I will try this when I get a chance thank you!!

 

[ultrarunner]

Keep a few extra solenoids on hand for quick rouble shooting down the road should it be needed.

 

[LittleBill21]

The fuel solenoid is 12v so I needed to use a 12v relay for the run signal. You are correct the controls do not know if the engine is running that is something we need to pursue fortunately the Yanmar starts like a first gen Cummins 1 turn & it’s running when it’s warm out. The oil pressure switch will be added later.
At least I have a system that works!
90cummins

your pictures show a 24 volt relay.

to add the oil pressure switch. which would serve 2 purposes. disconnect " fuel" from number 30, attach it to common on the OPS, from normally open or no, wire to blue #30. wire from normally closed on the oil pressure switch to wire 8 in the harness. this requires wire 10 to have battery power.

this will serve 2 purposes, the oil pressure will actually indicate the engine is running. if the oil pressure fails for some reason, it will NC and tell the ags to shutdown.

you may have to play with the hold times to make sure the pressure comes up in time before it shuts off.

 

[90cummins]

(your pictures show a 24 volt relay).
You are right I missed that. I have 12 & 24v relays on hand and picked up a 24v relay to show the schematic, both 12&24 v relays are wired the same.
Sorry for the confusion
90cummins

I’ll add the pressure switch when I get some time.
Thank you

 

[Patrick Herd]

Sounds like you're 90% there now, as you say with the way it's wired now, the controller thinks the motor is running even if it isn't. Oil pressure switch will sort that issue nicely. It will also serve to shut things down if it loses oil pressure while running.

 

[RalphVa]

10 Year Maintenance on Isuzu 12.5 kw, real gem bought from Central Maine Diesel. Never heard from them either by email, phone or fax. Got replacement fuel and oil filters locally at NAPA. Had a Donaldson air filter bought 9 years ago from CMD.



Done 28 June 2022



Note re next time: replace coolant, fuel and air filters and run engine to warm up oil first. Otherwise, it takes forever to extract the cold oil.



Put on Donaldson air filter bought 9 years ago from Central Maine Diesel. Replacement is WIX/NAPA 6449



Fuel filter: NAPA 3399 Need chain wrench to remove. Not room for any of the others.



Oil filter: NAPA 1334. The two filter NAPA wrench removes it.



Six quarts of M1 0w30 European C3 diesel and 1 qt of leftover Castrol 5w30 for VW TDI



Nearly a gallon of coolant comes out via the petcock on the south side of radiator. Block drain was way tight. Did not remove.

 

[3930dave]

10 Year Maintenance on Isuzu 12.5 kw, real gem bought from Central Maine Diesel. Never heard from them either by email, phone or fax. Got replacement fuel and oil filters locally at NAPA. Had a Donaldson air filter bought 9 years ago from CMD.



Done 28 June 2022



Note re next time: replace coolant, fuel and air filters and run engine to warm up oil first. Otherwise, it takes forever to extract the cold oil.



Put on Donaldson air filter bought 9 years ago from Central Maine Diesel. Replacement is WIX/NAPA 6449



Fuel filter: NAPA 3399 Need chain wrench to remove. Not room for any of the others.



Oil filter: NAPA 1334. The two filter NAPA wrench removes it.

The Generator Gods tend to smile, when offered tribute like you did

Rgds, D.

Six quarts of M1 0w30 European C3 diesel and 1 qt of leftover Castrol 5w30 for VW TDI



Nearly a gallon of coolant comes out via the petcock on the south side of radiator. Block drain was way tight. Did not remove.

 

[3930dave]

The fuel solenoid is 12v so I needed to use a 12v relay for the run signal. You are correct the controls do not know if the engine is running that is something we need to pursue fortunately the Yanmar starts like a first gen Cummins 1 turn & it’s running when it’s warm out. The oil pressure switch will be added later.
At least I have a system that works!
90cummins

Cross-country (and Continent !) bench tuning...... Why I hang out here !

Congratulations 90 on going Autorun. Nice for long Winter (outage) nights, or when the better-half is on her own.....

With your mechanical skills and that Yanmar, I'm sure it's in good shape. That said, we all learned vigilance re. Murphy long ago.... that oil Pswitch will be nice fail-safe.

Rgds, D.

 

[90cummins]

Ralph in Va
Before I created my system I researched all the gens out there and concluded that the Isuzu was in my opinion the best of the best.
90cummins

 

[Rustyiron]

This past Sunday, calm summer day, a little on the hot side and the power goes "out". The utility has been doing a great job over the past few years tree trimming so it must be a car/pole/stupid driver situation.
Got another 4 hours on the generator (just for the freezers)
....and someone did take out a pole. This time I opened up the building all I could with the temperature. No issues.