grimmers1(at)ntlworld.com Guest
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Posted: Tue Feb 28, 2006 5:25 pm Post subject: Ground Power circuit diagram query & suggestion |
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Hi Bob,
I don't understand the need for a push-to-test lamp in your Low Cost
Ground Power circuit (rev C 07/21/05).
Surely it would provide a more useful function if it were a regular lamp
directly connected to ground, therefore providing either;
(a) a warning of presence of a ground power source, or;
(b) a warning that the switch/breaker for ground power contactor is
still closed (where the ground power contactor is held closed by ship's
battery). This function seems important since the contactor takes
nearly a Amp to maintain.
Either of those without having to press a button to find out. Since you
need some ground power-side volts to light it anyway, it will normally
be off AND "un-testable".
Better still, you could use a bi-colour LED, with GREEN for correct
polarity and RED for inverted (help save a contactor diode if you
reverse-connect the leads to the 4x4)
My 1st post & just getting my head round all the issues, so excuse me if
I missed something obvious. Looking forward to the book arriving
tomorrow.
Regards,
Andy Grimshaw
grimmers1(at)ntlworld.com
Jodel DR200 group home-build (panel & electrics still on the drawing
board)
UK
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