Today's Message Index:
----------------------
1. 01:35 PM - Master Relay current draw... (andymeyer)
2. 02:37 PM - Re: Master Relay current draw... (Charlie England)
3. 08:39 PM - Re: Master Relay current draw... (user9253)
4. 08:48 PM - Re: Master Relay current draw... (user9253)
5. 10:04 PM - Re: Master Relay current draw... (Robert L. Nuckolls, III)
6. 10:11 PM - Re: Master Relay current draw... (Bob Verwey)
Message 1
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| Subject: | Master Relay current draw... |
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?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509784#509784
Message 2
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| Subject: | Re: Master Relay current draw... |
On 12/25/2022 3:34 PM, andymeyer wrote:
>
> 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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Message 3
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| Subject: | Re: Master Relay current draw... |
According to this post:
http://www.matronics.com/searching/getmsg_script.cgi?INDEX=117069337?KEYS=.6_amps_warm?LISTNAME=AeroElectric?HITNUMBER=3?SERIAL=18371020034?SHOWBUTTONS=YES
A Cole-Hersee contactor draws 1 amp cold and drops to about 0.6 amps warm.
Current is determined by the load, the contactor coil is this case.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509791#509791
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| Subject: | Re: Master Relay current draw... |
Bob's Contactor duty cycle controller
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509792#509792
Attachments:
http://forums.matronics.com//files/contactor_duty_cycle_controller_171.pdf
Message 5
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| Subject: | Re: Master Relay current draw... |
At 03:34 PM 12/25/2022, you wrote:
>
>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?"
Message 6
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| Subject: | Re: Master Relay current draw... |
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@gmail.com> wrote:
ceengland7@gmail.com>
On 12/25/2022 3:34 PM, andymeyer wrote:
>
>
> 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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