Today's Message Index:
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1. 04:41 PM - Infinity grip (Mauri Morin)
2. 05:47 PM - Re: Infinity grip (Robert L. Nuckolls, III)
Message 1
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Bob,
I'm in the process of wiring my RV-8 and have a switch on the Infinity
grip to control the Airflow Performance (API) aux fuel pump.
The literature on the pump says the current draw is 5 amps at 12 volts
and should be protected with a 10 amp c/b.
The switch in the grip is rated at 6 amp at 12volts.
API engineering thinks the switch in the grip may not be able to handle
the inrush current on the pump when actitivated and thinks I should use
a relay which I'd rather not do.
J.D at Infinity Aerospace thinks a zener diode will solve this problem
and suggested I check with you for your opinion and a possible circuit.
Since this combination of grip and pump has been used in a lot of RVs, I
thought that, if this was a problem, it would have been solved by
someone already.
Mauri Morin
Ronan, MT
Message 2
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| Subject: | Re: Infinity grip |
At 06:30 PM 5/4/2010, you wrote:
>Bob,
>I'm in the process of wiring my RV-8 and have a switch on the
>Infinity grip to control the Airflow Performance (API) aux fuel pump.
>The literature on the pump says the current draw is 5 amps at 12
>volts and should be protected with a 10 amp c/b.
>The switch in the grip is rated at 6 amp at 12volts.
>API engineering thinks the switch in the grip may not be able to
>handle the inrush current on the pump when actitivated and thinks I
>should use a relay which I'd rather not do.
>J.D at Infinity Aerospace thinks a zener diode will solve this
>problem and suggested I check with you for your opinion and a possible circuit.
>
>Since this combination of grip and pump has been used in a lot of
>RVs, I thought that, if this was a problem, it would have been
>solved by someone already.
API is correct in that some sort of buffering
between the switch and motor is called for.
It's probably a PM motor with a significant
spin-up transient. The relay is the simplest.
You can do it with a single transistor and a
few jelly bean components too. I can sketch
either.
Bob . . .
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