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1. 03:45 PM - Starter Circuit: Verner 7U Radial (Eric Page)
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| Subject: | Starter Circuit: Verner 7U Radial |
I have a friend who's building a Kitfox with a Verner Motor Scarlett 7U radial
engine.
http://www.vernermotor.com/page1.html#features18-24
The engine is shipped with a starter that features an integral solenoid. The connections
to the ship's wiring are as follows:
- One terminal on the motor case which is the ground lug. This gets a fat wire
to the forest-of-tabs through-bolt.
- Two terminals on the solenoid: One gets a fat wire carrying 12V from the switched
side of the battery contactor. This supplies current to the motor via an
internal connection. The other solenoid terminal receives 12V to activate the
solenoid's coil. The coil is grounded internally.
My friend's question is whether it is necessary to install a separate starter contactor
to send 12V to the starter solenoid's control terminal, or if the start
switch can control the starter solenoid directly. The Z-diagrams show a starter
contactor controlling a starter with attached solenoid, but neither of us
can deduce why it's necessary to wire what are essentially two big relays in
series.
If the separate contactor is necessary, then please explain:
1. Why?
2. Should it supply all power to the starter -- both motor current and control
signal -- or, just the control signal?
Thanks!
Eric
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511100#511100
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