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Electrical Control / Junction Box
side view, the starter solenoid connectors are visible
to the left as well as the engine control panel connector
(upper) and the remote (usually aircraft) air producer
connector
(lower).
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The cover of the junction box has
a barley visible wiring diagram glued to it's inner face.
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A view of the Electrical Control
/ Junction Box with the lid removed, the starter solenoid
is to the left (hard
to see) and the gas pressure switch is to the upper right
hand side.
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Now to make a basic I/O panel, all
of the Palouste's external control wiring will be soldered
in to a large multi pole connector, power will be supplied
via an Anderson 24Volt connector and finally fuel through
a hydraulic 3/8 quick release fitting.
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Again I'm using a tried and test
'Lucas CAV' type fuel filter assembly.
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The start of the wiring, now just
waiting for the old style 'Breeze' connectors to turn up
from Servo, £100 just on connectors, not a cheap hobby.
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I have now redrawn the wiring diagram
and also added a switched earth connection to previously
unused pin D, this
will be connected to an Indicator on the control panel
to show the status of the air pressure switch. Also added
but not shown on the diagram are EMF reduction diodes,
these reduce electrical contact damage caused by the
solenoids.
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Basic control panel wiring diagram. |
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L to R. RPM, EGT, space
for Oil PSI, Ammeter, run On/Off Sw & Ind, Air Pressure
Sw Ind (above), Dry Cycle Sw
& Ind, ADV Sw & Ind, Master Power & Ind.
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Yet again I am using a 2U ABS flight
case as the control box enclosure, with matching faceplate
and tray. |
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It turns out that the RPM gauge that
I have is faulty so it has been replaced with an DC10
APU gauge, to get it to work correctly Ian has kindly
made me an interface circuit that sorts this issue out,
the circuit is pictured upper centre.
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Updated front view of the control
panel. |
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MGF
(11)