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The K7 relay switch is passively closed all the time, until it trips open from a LOP condition. (low oil pressure)
It is a an automatic off switch that trips off on a heat up of an internal metal piece that gets hot form the LOP condition, so like a thermal breaker, but only one side is a...
I was given an old Onan MCCK marine generator.
The K7 relay-emergency device is crushed so beyond repair, and these parts are long ago out of production.
What I would like to do is design something that would function in a similar way.
The way the device works is if low oil pressure (LOP)...
Thanks, dont try to out think me, not a trick question, I fool myself too.
I worded this way to try to approach the problem circuit another way as I was getting no where with my thinking.
I eventually did get it to work using an NPN transistor.
This is an ignition point saver circuit using a...
looking for a circuit that when goes open circuit from a ground, it conducts.
So imagine, if a grounded switch is turned off (grounded state breaks to an open circuit, it closes a complementary circuit. like a transistor conducts from E to C
Not a relay, if needs to be a semiconductor switch...
I studied this Control - O - Matic Onan MCCK schematic some more.
AIR4 and AIR1 form a voltage divider, like a potentiometer, to lower the rectified small AC volts coming from T1 sense coil. Sense coil produces volts when AC gen is putting out power.
Decreasing AIR1 would take away volts going...
It is working again. I used IRF 1010E instead of FQP50N06. The IRF 1010E have an 85 amp rating versus 50 amp rating.
Since I replaced all 16 of them, I suppose the various parameters, capacitances etc... dont matter so much.
Here are the mods I made to help the board survive.
Soldered on a bare...
Well, in a way it was fun. What I thought might happen did happen.
I destroyed the inverter's input mosfets.
I looked into what happened and the board traces are too weak to support the higher current on the DC side.
Two drain traces opened under load, then that overloaded couple more input...
I am not even sure how to ask the question, but I will describe.
This Onan has an auto start and stop feature.
Works great except the off part does not turn off if an AC device is still drawing power. Which is what you want.
But it is the setting thresh hold for the off I want to modify.
I...
I hooked it up to a 12 v battery and the resistor barely gets warm. This is a clear case LED.
Interesting that it will not burn out at 17vdc.
I originally hooked up a cube relay spdt (auto Potter & Brumfield) to the 17 volt output to be shared with the 4PDT 35 amp relay (which is really a 120...
I reconfigured the LED light for 12vdc.
I simply put a 1k resistor in series with the LED.
Since I switch the 4PDT 35 amp relay using 15 to 17vdc, it makes sense to let the green light show that the grid shore power is on or not on.
I already use a 12vdc yellow LED to indicate the other 4PDT 35...
I had been looking at these here
https://www.ebay.com/itm/5Pcs-120V-AC-DC-9mm-Green-Mini-Neon-Pilot-Lights-CYLINDRICAL-Cap-18-5CM-wire-/181633390456?pt=LH_DefaultDomain_0&hash=item2a4a319778
Which say they are green. I think they would fit the existing panel hole.
I had some red neons in...
Thanks for the comments
here it is, second picture I killed the flash so you can see it is on.
I slid it out unplugged and I can hold it between my fingers the resistor, I do have thick skin!
If it keeps working then I think I will use it as is. If it failed what would happen, the resistor...
I bought one of those off ebay but it soon failed.
I rebuilt the lamp using a Radio Shack green LED, a 1/4 watt 10k resistor on one leg and reused the diode on the other, so they are in series with the LED pilot light. I have been running it for a day now as a test and it does heat up to about...
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