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nuckolls.bob(at)aeroelect
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 Posted: Sun May 10, 2020 5:39 pm Post subject: Crossover Light on |
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| Quote: |
So..,, since then, I finished wiring in radios etc, and now the cross over light is on when I turn on only the Aux master (I have installed the Z-14 dual batt dual alternator). (It's in a Long Ez). Everything seems to work correctly, starter, crossover, etc. when I turn on the main master I don't get the light, when I turn on both masters, I don't get the light, it's just when I turn on only the Aux master. |
Boy . . . that's a lot of harxware to be
carrying around in an Ez . . .
You have discovered a 'bug' in the architecture.
A 'sneak path' exists from the hot aux bus thru
the cross-over contactor coil then through
the CROSSOVER WARN light to the DEAD main bus
as a 'ground'.
See https://tinyurl.com/ydg99c5w
You can fix this by adding a diode (any handy
size will do) in series with the CROSSOVER WARN
light as shown in the sketch.
You can install it in the lead wire to the
annunciator fixture. See
https://tinyurl.com/kyc6tq6
for the technique.
Thanks for the heads-up! I'll update
Z14 to add this fix.
Bob . . .
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skywagon185(at)gmail.com
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| Posted: Mon May 11, 2020 12:24 pm Post subject: Crossover Light on |
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Good catch by both of you electro-types....
Nice easy solution too....
On Sun, May 10, 2020 at 6:45 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | | Quote: |
So..,, since then, I finished wiring in radios etc, and now the cross over light is on when I turn on only the Aux master (I have installed the Z-14 dual batt dual alternator). (It's in a Long Ez). Everything seems to work correctly, starter, crossover, etc. when I turn on the main master I don't get the light, when I turn on both masters, I don't get the light, it's just when I turn on only the Aux master. |
Boy . . . that's a lot of harxware to be
carrying around in an Ez . . .
You have discovered a 'bug' in the architecture.
A 'sneak path' exists from the hot aux bus thru
the cross-over contactor coil then through
the CROSSOVER WARN light to the DEAD main bus
as a 'ground'.
See https://tinyurl.com/ydg99c5w
You can fix this by adding a diode (any handy
size will do) in series with the CROSSOVER WARN
light as shown in the sketch.
You can install it in the lead wire to the
annunciator fixture. See
https://tinyurl.com/kyc6tq6
for the technique.
Thanks for the heads-up! I'll update
Z14 to add this fix.
Bob . . .
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