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andymeyer
Joined: 31 Mar 2015
Posts: 54
Location: SW MI
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 Posted: Sun Dec 25, 2022 1:34 pm Post subject: Master Relay current draw... |
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Old master relay in my Long EZ - it's pulling about 2.3 amps - just the relay itself - sounds like it's way high. Any recommendations for a low current replacement?
What's the typical draw for one of these and what would cause the high draw? (I don't have the model of relay in front of me, but it appears to be a fairly standard relay) 12V system...
Do these relays have a pull-in and a holding circuit, or are they just a single pull-in coil that is energized the entire time the relay is closed?
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Ceengland
Joined: 11 Oct 2020
Posts: 391
Location: MS
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| Posted: Sun Dec 25, 2022 2:37 pm Post subject: Master Relay current draw... |
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On 12/25/2022 3:34 PM, andymeyer wrote:
| Quote: |
Old master relay in my Long EZ - it's pulling about 2.3 amps - just the relay itself - sounds like it's way high. Any recommendations for a low current replacement?
What's the typical draw for one of these and what would cause the high draw? (I don't have the model of relay in front of me, but it appears to be a fairly standard relay) 12V system...
Do these relays have a pull-in and a holding circuit, or are they just a single pull-in coil that is energized the entire time the relay is closed?
Might be a little high; you can download a datasheet from Spruce here:
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https://www.aircraftspruce.com/catalog/elpages/masterrelay.php
Any chance the builder installed a starter relay in the master slot?
Starter relays typically have higher coil current to engage quicker, etc.
You can spend a bunch more money on a solid state model, but I wouldn't
consider it good value.
Charlie
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Charlie |
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Sun Dec 25, 2022 8:48 pm Post subject: Re: Master Relay current draw... |
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Bob's Contactor duty cycle controller
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Download |
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Contactor_Duty-Cycle_Controller.pdf |
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55.27 KB |
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148 Time(s) |
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Joe Gores |
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nuckolls.bob(at)aeroelect
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| Posted: Sun Dec 25, 2022 10:04 pm Post subject: Master Relay current draw... |
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At 03:34 PM 12/25/2022, you wrote:
| Quote: | --> AeroElectric-List message posted by: "andymeyer" <meyerkc135(at)gmail.com>
Old master relay in my Long EZ - it's pulling about 2.3 amps - just the relay itself - sounds like it's way high. Any recommendations for a low current replacement? |
Yes, that IS waayyy too high for a battery contactor.
It's been suggested that you may have inadvertently
installed an intermittant duty contactor. Here's
one option for a more appropriate device.
https://tinyurl.com/y9nbkhgo
See:
http://aeroelectric.com/Pictures/Contactors/Battery_Contactor_Temps_1.jpg
http://aeroelectric.com/Pictures/Contactors/Battery_Contactor_Temps_2.jpg
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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bob.verwey(at)gmail.com
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| Posted: Sun Dec 25, 2022 10:11 pm Post subject: Master Relay current draw... |
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Andy the " homebuilt" master relay I purchased from Spruce recently does not even draw 1 amp. While working on the aircraft late one afternoon I forgot to turn it off...the next morning it was warm to the touch but the battery voltage was still in the normal range. On my old Bonanza I noticed that the starter contactor drew higher current than the master contactor, also they are the older style devices..
Best...Bob
On 26 Dec 2022 00:39, "Charlie England" <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote: | Quote: | --> AeroElectric-List message posted by: Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)>
On 12/25/2022 3:34 PM, andymeyer wrote:
> --> AeroElectric-List message posted by: "andymeyer" <meyerkc135(at)gmail.com (meyerkc135(at)gmail.com)>
>
> Old master relay in my Long EZ - it's pulling about 2.3 amps - just the relay itself - sounds like it's way high. Any recommendations for a low current replacement?
>
> What's the typical draw for one of these and what would cause the high draw? (I don't have the model of relay in front of me, but it appears to be a fairly standard relay) 12V system...
>
> Do these relays have a pull-in and a holding circuit, or are they just a single pull-in coil that is energized the entire time the relay is closed?
Might be a little high; you can download a datasheet from Spruce here:
https://www.aircraftspruce.com/catalog/elpages/masterrelay.php
Any chance the builder installed a starter relay in the master slot?
Starter relays typically have higher coil current to engage quicker, etc.
You can spend a bunch more money on a solid state model, but I wouldn't
consider it good value.
Charlie
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andymeyer
Joined: 31 Mar 2015
Posts: 54
Location: SW MI
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| Posted: Tue Dec 27, 2022 5:21 am Post subject: Re: Master Relay current draw... |
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Thanks! Getting a new one on the way ASAP.
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