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jan_de_jong(at)casema.nl
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 Posted: Fri Feb 11, 2011 12:26 pm Post subject: Aeroelectric-list: Battery disconnect switch |
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| Quote: | >To be able to use it as a normal on-off switch I am thinking of an
>adapter with 3 input pins - ground, power and switch - and the
>required 4-pin Tyco plug as the output.
>Switch to power (from open or ground) would generate an ON pulse,
>switch to ground (from open or power) would generate an OFF pulse,
>switch to open (from ground or power) would not do anything.
>If ever no switching action results when expected: repeat manually -
>introducing memory and automatic repeat goes too far I think.
Another thought. The coil resistance is stated as 4.7 ohms.
This translates to a coil draw on the order of 2.5 amps
while energized. The specs also state 100 mS max for transfer
pulse. This means that you probably have to device control
circuitry that LIMITS control inputs to input pulses having
a fixed and limited duration.
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Yes - adapter must have power and ground.
Without having put pen to paper I was thinking of a few parts like:
- R and C for 50ms
- comparator with builtin reference and hysteresis good for automotive Vs
- PNP with emitter resistor for 5A current limit or so
- the odd resistor and diode.
Jan de Jong
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jan_de_jong(at)casema.nl
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| Posted: Sat Feb 12, 2011 1:26 am Post subject: Aeroelectric-list: Battery disconnect switch |
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| Quote: | Suspect that it would work just fine for many years with a momentary
spring loaded on-off-on toggle switch and no conditioning circuitry.
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I think so too.
It is just for present relay uses that need on-off action that a pulse
would have to made.
An example would be the aux battery auto-connect function.
But that can be a smaller regular relay if the aux battery does not help
cranking.
Manual on could be replaced by 2 actions (2 switches): enable then
momentary-on.
Manual off by: momentary-off then disable.
>What do you think?
>
>-Jeff
I think so too.
It should not get hot.
And it holds position at 40g it says.
Jan de Jong
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