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B-lead relay for IR Alternator

 
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nuckolls.bob(at)aeroelect
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PostPosted: Sun Sep 09, 2018 1:59 pm    Post subject: B-lead relay for IR Alternator Reply with quote

At 10:07 AM 8/23/2018, you wrote:
Quote:
At 05:36 AM 8/23/2018, you wrote:
Quote:
i started wiring my ovm and i have a question about auto relays. the contactor i have for the lead off my alternator really bugs me that i am adding 14 ounces just for this ''switch''. my alternator is rated at 37 amps but the 40 and even 50 amp auto relays look like that have a ''faston tab'' for their terminal. are these terminals up to carrying the load from the alternator?
bob

You might consider this product:

https://goo.gl/UAVJMw

I have no experience with these . . . I'm
going to order one to peek and poke at . . .
but the specs are right.

I'd wire the b-lead up with 6AWG welding
cable.

https://goo.gl/BxAj1V

I ordered one of those relays in to look at:
Here are the 'tear down' photos.

https://tinyurl.com/y7aw646a

This critter seems nicely built. The resting
current for the coil at 14v is about 0.3 amps
for an internal dissipation of about 4.5 watts.
Not seriously pushing it for this size package.
I think I would mount it with the terminals facing
down. This would cause any drips or condensate to
collect on the closeout panel . . . and
facilitate expulsion during the next
flight cycle.

At 4.5 watts it's too hot to keep your
hand on it . . . but battery contactors
do that too.

Internal 'werks' seem robust enough. The
stationary and moveable contacts both
feature precious alloy crowns. I think
it's worth trying as the b-lead disconnect
relay in an ov management system on an
internally regulated alternator.



Bob . . .


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rsmith52



Joined: 16 Mar 2017
Posts: 5
Location: Crawford, CO

PostPosted: Mon Sep 10, 2018 7:39 am    Post subject: B-lead relay for IR Alternator Reply with quote

Glad to hear that this relay checks out. I will order one to use as an aux battery contactor, will see 10-12 amp max.

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bobnoffs



Joined: 04 Jul 2012
Posts: 81
Location: northern wi.

PostPosted: Tue Sep 11, 2018 3:32 am    Post subject: B-lead relay for IR Alternator Reply with quote

i ordered that relay and just got it installed for my b lead ovm. glad to hear your report, bob. i was a little worried about the plastic mounting point breaking so mine is mounted with the mounting point flat down against a surface.

 bob noffs
On Sun, Sep 9, 2018 at 5:04 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

Quote:
At 10:07 AM 8/23/2018, you wrote:
Quote:
At 05:36 AM 8/23/2018, you wrote:
Quote:
i started wiring my ovm and i have a question about auto relays. the contactor i have for the lead off my alternator really bugs me that i am adding 14 ounces just for this ''switch''. my alternator is rated at 37 amps but the 40 and even 50 amp auto relays look like that have a ''faston tab'' for their terminal. are these terminals up to carrying the load from the alternator?
 bob

  You might consider this product:

https://goo.gl/UAVJMw

  I have no experience with these . . . I'm
  going to order one to peek and poke at . . .
  but the specs are right.

  I'd wire the b-lead up with 6AWG welding
  cable.

https://goo.gl/BxAj1V

  I ordered one of those relays in to look at:
  Here are the 'tear down' photos.

  https://tinyurl.com/y7aw646a

  This critter seems nicely built. The resting
  current for the coil at 14v is about 0.3 amps
  for an internal dissipation of about 4.5 watts.
  Not seriously pushing it for this size package.
  I think I would mount it with the terminals facing
  down. This would cause any drips or condensate to
  collect on the closeout panel . . . and
  facilitate expulsion during the next
  flight cycle.

  At 4.5 watts it's too hot to keep your
  hand on it . . . but battery contactors
  do that too.

  Internal 'werks' seem robust enough. The
  stationary and moveable contacts both
  feature precious alloy crowns.  I think
  it's worth trying as the b-lead disconnect
  relay in an ov management system on an
  internally regulated alternator.



  Bob . . .


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nuckolls.bob(at)aeroelect
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PostPosted: Tue Sep 11, 2018 7:29 am    Post subject: B-lead relay for IR Alternator Reply with quote

At 06:31 AM 9/11/2018, you wrote:
Quote:
i ordered that relay and just got it installed for my b lead ovm. glad to hear your report, bob. i was a little worried about the plastic mounting point breaking so mine is mounted with the mounting point flat down against a surface.
bob noffs

Yeah . . . I supecdt the housing is glass-filled
nylon . . . pretty robust. But that's also why
I suggested 'soft' fat-wires like welding cable.



Bob . . .


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