Speedy11(at)aol.com
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 Posted: Wed Dec 02, 2009 6:55 am Post subject: AeroElectric-List Digest: 19 Msgs - 12/01/09 |
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The continuous duty contactor I have installed is temporary. I will replace it with an intermittent duty one.
I installed the Skytec starter as it arrived from the manufacturer - that is, with the jumper from the contactor's control line to the main terminal installed. I left the jumper installed because Skytec recommend it - see http://www.skytecair.com/images/Certified%20LS%20Wiring_1100.jpg. My error, of course, was that I left out what they call the master solenoid.
This is Van's recommended wiring [url=http://www.skytecair.com/images/Van\'s%20Starter%20Wiring%20Lg.jpg]http://www.skytecair.com/images/Van's%20Starter%20Wiring%20Lg.jpg[/url], but Skytec recommends against wiring this way.
Bob, are you implying that I should have removed the jumper wire from the starter?
I will refer to Z-22 as I rewire.
Stan Sutterfield
| Quote: | At 01:01 PM 12/1/2009, you wrote:
| Quote: | The contactor in question is a B&C S702-1. I talked to Bill
Bainbridge at B&C and he suggested trying the contactor again. I
will bench test it (actually already have but will do it again) and
rewire according to B&C diagram with battery switch between battery
and starter contactor. That way I can remove power to the contactor if needed.
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That particular design has been applied in the
gazillions in automotive applications and is well
proven. There are so many clones of the concept
I'd be hard pressed to identify the original any
more. I don't know where B&C buys their inventory
now. At one time, they were offering two versions
of that form factor in intermittent duty contactors.
One version was qualified onto his first STC'd starter
installations. The second came with the inventory I sold
him and included a built in coil collapse suppression
diode. Yes, it's a lowly diode.
| Quote: | Right now I have installed a continuous duty contactor that I had
lying on the shelf, but it doesn't fit into my space as well as the
B&C contactor.
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A continuous duty contactor is never a suitable
substitute for controlling starter motors.
| Quote: | I did consider using only the starter-fitted contactor, but was
trying to follow Aeroelectric advice so inserted the additional
contactor. It would take additional wiring effort now to change.
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The "AeroElectric advice" has foundations in a lot of
discussion threads involving starters, styles of motors,
and system characteristics. If you're running a Skytec
PM starter and have jumpered the built in contactor's
control line to the main terminal, then it's almost
a certainty that your starter suffers from what we've
calls "starter run on" . . . a delayed disengagement
of the pinion gear due to counter-EMF generated by
a motor's armature spinning down in a permanent
magnet field. Ideas discovered and recipes developed
from those discussions spawned Figure Z-22.
| Quote: | The B&C S702-1 contactor has an internal diode so the starter switch
was connected to the S terminal with no external diode. I did not
install a starter engaged light, but plan to add one as I rewire things.
Rewiring will consist of adding #2 welding cable from the battery to
the battery switch and then to the contactor. Also I'll wire up a
starter engaged light.
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Please rewire per Z-22. This is important for several
reasons:
(1) You have a PM starter motor and the
change will improve the life of your starter motor,
pinion gear and ring gear.
(2) You'll eliminate the potential for sticking
the contactor again.
(3) This also reduces the number of metallic joints
and contact sets in series with the starter. All of
these are good things.
Bob |
[quote][b]
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