Greetings Everybody,
Please imagine a small watercooled motor confined in non-ventilated enclosure (it is noisy). It has its own 12V alternator and a led acid battery. I turn it on and off manually, as needed.
The motor overheats the enclosure space causing premature decomposition of rubber hoses and plastic components within the enclosure.
I would like to add a bank of 12v (20A max total draw) cooling fans to the side wall of the enclosure to push in some cold air.
I don't need fans going until the motor comes up to the temperature. I think about fitting a thermal switch into the motor water jacket to activate the fan circuit.
(1) Upon turning the motor "off", I'd like the fans to stay "on" for 3-5 minutes during the motor heat soak cycle.
So far, so good, pretty straight-forward.
Here is the rest of the story...
Let's assume that I run the unit for a while and shut it off. After 5 minutes fans are turned off by the timer. Cool...
Than, I may decide to turn it on, again. At this point of time the motor is still hot and the thermal switch in the waterjacket is "hot". Fans will create an instant excessive load in the alternator circuit and will burn the voltage regulator.
Not pretty.
So, to avoid this calamity, the delay timer, in addition to function (1), has to have an additional function built in.
(2) It needs to detect if the thermocouple circuit is "on" and delay turning fans by 1 minute allowing the alternator to come up to the normal working parameters.
The rest is the same... After I turn the contraption off, fans stay "on" for 5 minutes and shut off.
The first part (1) is not that complicated, but (2) needs some kind of a logic function switch.
Input 1 (thermo couple switch)
1a on/ motor hot, than-activate 1min delay and turn fans ON
1b off/ motor cold, than- turn fans ON
Input 2 (main powr switch(+12v) )
2a if on (+12v), than- keep fans circuit ON
2b if off (0v) , than -activate 5min delay and turn fansOFF
Please imagine a small watercooled motor confined in non-ventilated enclosure (it is noisy). It has its own 12V alternator and a led acid battery. I turn it on and off manually, as needed.
The motor overheats the enclosure space causing premature decomposition of rubber hoses and plastic components within the enclosure.
I would like to add a bank of 12v (20A max total draw) cooling fans to the side wall of the enclosure to push in some cold air.
I don't need fans going until the motor comes up to the temperature. I think about fitting a thermal switch into the motor water jacket to activate the fan circuit.
(1) Upon turning the motor "off", I'd like the fans to stay "on" for 3-5 minutes during the motor heat soak cycle.
So far, so good, pretty straight-forward.
Here is the rest of the story...
Let's assume that I run the unit for a while and shut it off. After 5 minutes fans are turned off by the timer. Cool...
Than, I may decide to turn it on, again. At this point of time the motor is still hot and the thermal switch in the waterjacket is "hot". Fans will create an instant excessive load in the alternator circuit and will burn the voltage regulator.
Not pretty.
So, to avoid this calamity, the delay timer, in addition to function (1), has to have an additional function built in.
(2) It needs to detect if the thermocouple circuit is "on" and delay turning fans by 1 minute allowing the alternator to come up to the normal working parameters.
The rest is the same... After I turn the contraption off, fans stay "on" for 5 minutes and shut off.
The first part (1) is not that complicated, but (2) needs some kind of a logic function switch.
Input 1 (thermo couple switch)
1a on/ motor hot, than-activate 1min delay and turn fans ON
1b off/ motor cold, than- turn fans ON
Input 2 (main powr switch(+12v) )
2a if on (+12v), than- keep fans circuit ON
2b if off (0v) , than -activate 5min delay and turn fansOFF
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