nuckolls.bob(at)cox.net
Guest
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 Posted: Thu Dec 20, 2007 5:35 am Post subject: SD-8 Alternator OFF Annunciator? |
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At 07:50 AM 10/2/2007 -0700, you wrote:
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"With Z-13, you leave the SD-8 off until needed when
it is determined that the main alternator is off line
(lv light on). You drop to e-bus loads, open battery
contactor, turn SD-8 on and continue to airport of
intended destination. If the SD-8 is not overloaded,
the lv warning light will go back out."
With regards to the SD-8 and the lv light, Z-13 has a single lv light on
the diagram. The descripton for the PV/OV crows foot kit available from B
and C states that "The PM/OV was designed to give over voltage protection
to the permanet magnet alternator. The yellow light will annunciate if the
alternator switch is left off, or the crowbar over voltage protection has
been tripped. "
So, will the single lv light depicted on Z-13 light if either the main alt
or the SD-8 are off line?
If the SD-8 has its own unique lv light as described on the B and C site,
does it light if the aux alt selection switch is OFF? Or, does it only
light if the aux alt selector switch is ON AND the SD-8 is off line? If
the first case is true, during normal operation, the aux lv light will
alway remain lit which would not be an ideal situation.
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I don't think I've ever suggested the ALL OFF
warning light for the SD-8 as used in Z-13/8. The warning
light is useful when the SD-8 is a sole-source of engine
driven power in simple systems where there is no
real LV monitoring and warning system.
I've written many times in the past that the most
important electrical "instrument" in the electrical
system is the calibrated LOW VOLTS warning light
set to illuminate when the bus is below 13.0 volts.
Figure Z-13/8 suggests the AEC9005-101 LV Warning
module (or equivalent) and does not show the SD-8
ALT OFF light which is included in the B&C SD-8
installation kit. This indicator is not useful
in the Z-13/8 architecture.
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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