Today's Message Index:
----------------------
1. 04:17 AM - Re: OT: PCB coating removal (rampil)
2. 05:19 AM - Master contactor temp? (donjohnston)
3. 05:29 AM - Re: Master contactor temp? (Robert L. Nuckolls, III)
4. 05:49 AM - Re: Master contactor temp? (Bob McCallum)
5. 06:47 AM - Re: Master contactor temp? (Justin Jones)
6. 07:28 AM - Re: do I need to change my capacitor (AirEupora)
7. 07:30 AM - Re: Master contactor temp? (Charlie England)
8. 08:45 AM - Re: Master contactor temp? (Henador Titzoff)
9. 08:58 AM - Re: Master contactor temp? (Justin Jones)
10. 09:03 AM - Re: Master contactor temp? (Bill Watson)
11. 09:06 AM - Re: Master contactor temp? (Justin Jones)
12. 09:59 AM - Re: Master contactor temp? (Henador Titzoff)
13. 11:56 AM - Re: Master contactor temp? (Justin Jones)
14. 12:45 PM - Re: do I need to change my capacitor (user9253)
Message 1
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| Subject: | Re: OT: PCB coating removal |
Ah yes, the sweet simple days of in-band signaling and Cap'n Crunch ;)
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457421#457421
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| Subject: | Master contactor temp? |
I was having the altimeter/transponder check done recently when I noticed the master
contactor was hot. Too hot to touch for very long. Now I've never touched
a master contactor before so I don't know what "normal" is (OAT was in the
mid 90's).
When I got back to the hangar, I turned on the master and checked it with my point-and-shoot
thermometer. I was seeing around 120 after about 5 minutes. I think
it was a bit hotter while at the shop but I'm positive.
Once back at home, I pulled up the data sheet for the White-Rodgers 90-907 solenoid
and the only reference I can find for temperature is "Temperature Range
-40F to 122F"
I don't know if that range is ambient or device. If it's device, then I'm right
at the upper limit.
Do I need to be worried? Time for a new master contactor?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457424#457424
Message 3
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| Subject: | Re: Master contactor temp? |
At 07:17 AM 6/25/2016, you wrote:
<don@velocity-xl.com>
>
>I was having the altimeter/transponder check
>done recently when I noticed the master
>contactor was hot. Too hot to touch for very
>long. Now I've never touched a master contactor
>before so I don't know what "normal" is (OAT was in the mid 90's).
>
>When I got back to the hangar, I turned on the
>master and checked it with my point-and-shoot
>thermometer. I was seeing around 120 after
>about 5 minutes. I think it was a bit hotter
>while at the shop but I'm positive.
>
>Once back at home, I pulled up the data sheet
>for the White-Rodgers 90-907 solenoid and the
>only reference I can find for temperature is
>"Temperature Range =93=93 -40=C2=B0F to 122=C2=B0F"
>
>I don't know if that range is ambient or device.
>If it's device, then I'm right at the upper limit.
>
>Do I need to be worried? Time for a new master contactor?
No . . . all is right with the universe . . . See:
http://www.aeroelectric.com/Pictures/Contactors/Battery_Contactor_Temps_1.jp
g
http://www.aeroelectric.com/Pictures/Contactors/Battery_Contactor_Temps_2.jp
g
"too hot to touch" does not automatically translate
into un-desired performance. These contactors dissipate
about 8w at stable temps . . . which generates and expected
temperature rise of about 100F.
Bob . . .
Message 4
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| Subject: | Master contactor temp? |
Contactors draw about 1 amp, so at 14 volts that's 14 watts of heat which needs
to be dissipated. If you think about a 15 watt conventional light bulb being
continuously illuminated then trying to hold onto that (which you're unlikely
to be able to) you'll understand how hot the contactor can become. In short what
you have sounds "normal". You're only 30 or so above ambient which isn't particularly
"hot".
The quoted figures of -40 to 122 F would be referring to "ambient".
Bob McC
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of donjohnston
> Sent: Saturday, June 25, 2016 8:18 AM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Master contactor temp?
>
>
> I was having the altimeter/transponder check done recently when I noticed the
master
> contactor was hot. Too hot to touch for very long. Now I've never touched a
master
> contactor before so I don't know what "normal" is (OAT was in the mid 90's).
>
> When I got back to the hangar, I turned on the master and checked it with my
point-
> and-shoot thermometer. I was seeing around 120 after about 5 minutes. I think
it was a
> bit hotter while at the shop but I'm positive.
>
> Once back at home, I pulled up the data sheet for the White-Rodgers 90-907 solenoid
> and the only reference I can find for temperature is "Temperature Range -40F
> to 122F"
>
> I don't know if that range is ambient or device. If it's device, then I'm right
at the upper
> limit.
>
> Do I need to be worried? Time for a new master contactor?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=457424#457424
>
>
>
>
>
>
>
> _-
> =====================================================
> =====
> _-
> =====================================================
> =====
> _-
> =====================================================
> =====
> _-
> =====================================================
> =====
> _-
> =====================================================
> =====
>
Message 5
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| Subject: | Re: Master contactor temp? |
At 300A continuous and 500A inrush for 1 second, this solid state battery master
relay has done me quite well for over 100 hours. No moving parts means no arcing
and no wearing out of contacts. It allows current to flow both ways and works
flawlessly as wired into Bob's 13/8 diagram.
The original application was for the medical package on an ambulance.
https://www.waytekwire.com/item/44407/Data-Panel-33034-Solid-State-Battery-Disconnect/
Justin.
> On Jun 25, 2016, at 07:17, donjohnston <don@velocity-xl.com> wrote:
>
>
> I was having the altimeter/transponder check done recently when I noticed the
master contactor was hot. Too hot to touch for very long. Now I've never touched
a master contactor before so I don't know what "normal" is (OAT was in the
mid 90's).
>
> When I got back to the hangar, I turned on the master and checked it with my
point-and-shoot thermometer. I was seeing around 120 after about 5 minutes. I
think it was a bit hotter while at the shop but I'm positive.
>
> Once back at home, I pulled up the data sheet for the White-Rodgers 90-907 solenoid
and the only reference I can find for temperature is "Temperature Range
-40F to 122F"
>
> I don't know if that range is ambient or device. If it's device, then I'm right
at the upper limit.
>
> Do I need to be worried? Time for a new master contactor?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=457424#457424
>
>
>
>
>
>
>
>
>
>
Message 6
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| Subject: | Re: do I need to change my capacitor |
The MGL provides for the low voltage readings, but I did not catch it. I was flying
around with the battery voltage being shown.
With the new voltage regulator I'm showing 13.8v to 14.4v volts during flight.
If I turn on landing lights it will drop to about 13.4v.
Yes, I pattern the diode to the Jabiru figure, but did not install the over protection.
I'm now planning on doing that when I return from KOSH.
Trio Avionics only told me that the mother boards were burnt. The same for MGL.
I'll see if I can find a architecture drawings. Most of mine are hand drawn as
I could never find a computer drawing program that I could use effectively.
Thanks for the help.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457428#457428
Message 7
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| Subject: | Re: Master contactor temp? |
Might be great for contactor temps, but I'm pretty sure that the
purchase would burn a hole in my backside....
On 6/25/2016 8:45 AM, Justin Jones wrote:
>
> At 300A continuous and 500A inrush for 1 second, this solid state battery master
relay has done me quite well for over 100 hours. No moving parts means no
arcing and no wearing out of contacts. It allows current to flow both ways and
works flawlessly as wired into Bob's 13/8 diagram.
>
> The original application was for the medical package on an ambulance.
>
> https://www.waytekwire.com/item/44407/Data-Panel-33034-Solid-State-Battery-Disconnect/
>
> Justin.
>
>> On Jun 25, 2016, at 07:17, donjohnston <don@velocity-xl.com> wrote:
>>
>>
>> I was having the altimeter/transponder check done recently when I noticed the
master contactor was hot. Too hot to touch for very long. Now I've never touched
a master contactor before so I don't know what "normal" is (OAT was in
the mid 90's).
>>
>> When I got back to the hangar, I turned on the master and checked it with my
point-and-shoot thermometer. I was seeing around 120 after about 5 minutes.
I think it was a bit hotter while at the shop but I'm positive.
>>
>> Once back at home, I pulled up the data sheet for the White-Rodgers 90-907 solenoid
and the only reference I can find for temperature is "Temperature Range
-40F to 122F"
>>
>> I don't know if that range is ambient or device. If it's device, then I'm right
at the upper limit.
>>
>> Do I need to be worried? Time for a new master contactor?
>>
Message 8
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| Subject: | Re: Master contactor temp? |
I wonder if this device can be used as a starter solenoid?=C2- The 300A c
ontinuous looks pretty good, and it has fins to dissipate heat.=C2- Max c
urrent would only flow for 2-10 seconds at a time, which means it will take
a heat breather before the next attempt.=C2- Our starters never use more
than 300A that I know of.
The data sheet says it has internal diode protection for inductive loads, b
ut there is a 150 msec turn off time.=C2- How different is this turn off
time from our accepted mechanical solenoids?
That burning a hole in the back pocket stuff may be cheap compared to a fai
lure of a mechanical device far away from home.
=C2-Henador Titzoff
From: Justin Jones <jmjones2000@mindspring.com>
To: aeroelectric-list@matronics.com
Sent: Saturday, June 25, 2016 9:45 AM
Subject: Re: AeroElectric-List: Master contactor temp?
ng.com>
At 300A continuous and 500A inrush for 1 second, this solid state battery m
aster relay has done me quite well for over 100 hours. No moving parts mean
s no arcing and no wearing out of contacts. It allows current to flow both
ways and works flawlessly as wired into Bob's 13/8 diagram.
The original application was for the medical package on an ambulance.
https://www.waytekwire.com/item/44407/Data-Panel-33034-Solid-State-Battery-
Disconnect/
Justin.
> On Jun 25, 2016, at 07:17, donjohnston <don@velocity-xl.com> wrote:
>
om>
>
> I was having the altimeter/transponder check done recently when I noticed
the master contactor was hot.=C2- Too hot to touch for very long.=C2-
Now I've never touched a master contactor before so I don't know what "norm
al" is (OAT was in the mid 90's).
>
> When I got back to the hangar, I turned on the master and checked it with
my point-and-shoot thermometer.=C2- I was seeing around 120 after about
5 minutes. I think it was a bit hotter while at the shop but I'm positive.
>
> Once back at home, I pulled up the data sheet for the White-Rodgers 90-90
7 solenoid and the only reference I can find for temperature is "Temperatur
e Range =93=93 -40=C2=B0F to 122=C2=B0F"
>
> I don't know if that range is ambient or device. If it's device, then I'm
right at the upper limit.
>
> Do I need to be worried?=C2- Time for a new master contactor?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=457424#457424
>
>
>
>
>
>
>
>
>
>
-
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 9
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| Subject: | Re: Master contactor temp? |
They are $160. That's slightly more expensive than a good quality continuous duty
relay like Skytec, but you only make the purchase one time. Cheap when talking
about aircraft parts.
> On Jun 25, 2016, at 09:32, Charlie England <ceengland7@gmail.com> wrote:
>
>
> Might be great for contactor temps, but I'm pretty sure that the purchase would
burn a hole in my backside....
>
>> On 6/25/2016 8:45 AM, Justin Jones wrote:
>>
>> At 300A continuous and 500A inrush for 1 second, this solid state battery master
relay has done me quite well for over 100 hours. No moving parts means no
arcing and no wearing out of contacts. It allows current to flow both ways and
works flawlessly as wired into Bob's 13/8 diagram.
>>
>> The original application was for the medical package on an ambulance.
>>
>> https://www.waytekwire.com/item/44407/Data-Panel-33034-Solid-State-Battery-Disconnect/
>>
>> Justin.
>>
>>> On Jun 25, 2016, at 07:17, donjohnston <don@velocity-xl.com> wrote:
>>>
>>>
>>> I was having the altimeter/transponder check done recently when I noticed the
master contactor was hot. Too hot to touch for very long. Now I've never
touched a master contactor before so I don't know what "normal" is (OAT was in
the mid 90's).
>>>
>>> When I got back to the hangar, I turned on the master and checked it with my
point-and-shoot thermometer. I was seeing around 120 after about 5 minutes.
I think it was a bit hotter while at the shop but I'm positive.
>>>
>>> Once back at home, I pulled up the data sheet for the White-Rodgers 90-907
solenoid and the only reference I can find for temperature is "Temperature Range
-40F to 122F"
>>>
>>> I don't know if that range is ambient or device. If it's device, then I'm right
at the upper limit.
>>>
>>> Do I need to be worried? Time for a new master contactor?
>
>
>
>
>
Message 10
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| Subject: | Re: Master contactor temp? |
Nice. And 125mAmp continuous for the control circuit is about 12% of
the standard contactor isn't it?
On 6/25/2016 9:45 AM, Justin Jones wrote:
>
> At 300A continuous and 500A inrush for 1 second, this solid state battery master
relay has done me quite well for over 100 hours. No moving parts means no
arcing and no wearing out of contacts. It allows current to flow both ways and
works flawlessly as wired into Bob's 13/8 diagram.
>
> The original application was for the medical package on an ambulance.
>
> https://www.waytekwire.com/item/44407/Data-Panel-33034-Solid-State-Battery-Disconnect/
>
> Justin.
>
>> On Jun 25, 2016, at 07:17, donjohnston <don@velocity-xl.com> wrote:
>>
>>
>> I was having the altimeter/transponder check done recently when I noticed the
master contactor was hot. Too hot to touch for very long. Now I've never touched
a master contactor before so I don't know what "normal" is (OAT was in
the mid 90's).
>>
>> When I got back to the hangar, I turned on the master and checked it with my
point-and-shoot thermometer. I was seeing around 120 after about 5 minutes.
I think it was a bit hotter while at the shop but I'm positive.
>>
>> Once back at home, I pulled up the data sheet for the White-Rodgers 90-907 solenoid
and the only reference I can find for temperature is "Temperature Range
-40F to 122F"
>>
>> I don't know if that range is ambient or device. If it's device, then I'm right
at the upper limit.
>>
>> Do I need to be worried? Time for a new master contactor?
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=457424#457424
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 11
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|
| Subject: | Re: Master contactor temp? |
I am not sure if it would work for a starter relay or not. One behavior I no
ticed is when I leave my LED instrument lights on and shut the battery off (
this solid state relay) the LEDs will dim down while shutting off (like dimm
ing them with a pwm). If I shut the LEDs off with their switch, they turn of
f instantly. Odd, but it doesn't seem to have any ill effects.
Justin
> On Jun 25, 2016, at 10:40, Henador Titzoff <henador_titzoff@yahoo.com> wro
te:
>
> I wonder if this device can be used as a starter solenoid? The 300A conti
nuous looks pretty good, and it has fins to dissipate heat. Max current wou
ld only flow for 2-10 seconds at a time, which means it will take a heat bre
ather before the next attempt. Our starters never use more than 300A that I
know of.
>
> The data sheet says it has internal diode protection for inductive loads, b
ut there is a 150 msec turn off time. How different is this turn off time f
rom our accepted mechanical solenoids?
>
> That burning a hole in the back pocket stuff may be cheap compared to a fa
ilure of a mechanical device far away from home.
>
> Henador Titzoff
>
>
> From: Justin Jones <jmjones2000@mindspring.com>
> To: aeroelectric-list@matronics.com
> Sent: Saturday, June 25, 2016 9:45 AM
> Subject: Re: AeroElectric-List: Master contactor temp?
>
ing.com>
>
> At 300A continuous and 500A inrush for 1 second, this solid state battery m
aster relay has done me quite well for over 100 hours. No moving parts means
no arcing and no wearing out of contacts. It allows current to flow both wa
ys and works flawlessly as wired into Bob's 13/8 diagram.
>
> The original application was for the medical package on an ambulance.
>
> https://www.waytekwire.com/item/44407/Data-Panel-33034-Solid-State-Battery
-Disconnect/
>
> Justin.
>
> > On Jun 25, 2016, at 07:17, donjohnston <don@velocity-xl.com> wrote:
> >
com>
> >
> > I was having the altimeter/transponder check done recently when I notice
d the master contactor was hot. Too hot to touch for very long. Now I've n
ever touched a master contactor before so I don't know what "normal" is (OAT
was in the mid 90's).
> >
> > When I got back to the hangar, I turned on the master and checked it wit
h my point-and-shoot thermometer. I was seeing around 120 after about 5 min
utes. I think it was a bit hotter while at the shop but I'm positive.
> >
> > Once back at home, I pulled up the data sheet for the White-Rodgers 90-9
07 solenoid and the only reference I can find for temperature is "Temperatur
e Range =93=93 -40=C2=B0F to 122=C2=B0F"
> >
> > I don't know if that range is ambient or device. If it's device, then I'
m right at the upper limit.
> >
> > Do I need to be worried? Time for a new master contactor?
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=457424#457424
> >
> >
> >
> &ga href="http://www.matronics.com/Navigator?AeroElectric-List" target=
"_tp://forums.matronics.com/" target="_blank">http://forums.matronics.comh
ttp://wiki.matronics.comp; -Matt Dralle, Li======
===
>
>
>
>
>
Message 12
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| Subject: | Re: Master contactor temp? |
One of the problems with solid state devices is they will bleed current whe
n "OFF."=C2- The manufacturer of this device does not state the bleed cur
rent on the datasheet.=C2- They only state the max and max inrush current
s as well as the max voltage drop at 150A.
The bleeding of current was never a factor when incandescent lights were us
ed, because they required higher magnitudes of current relative to LEDs and
went totally dim at milliamps of current.=C2- LED lights, on the other h
and, are relatively efficient and use tens of milliamps of current when ope
rating.=C2- When "OFF," they still shine dimly at tens or hundreds of mic
roamps.=C2- Perhaps you can contact the relay manufacturer and ask when w
hat the current bleed spec is.=C2- Their leaving it off may be an indicat
ion of a problem.
This bleed is one good reason not to go with such a relay for both master a
nd starter unless you maintain your battery very well.=C2- In cars, we fi
re them up and charge them daily.=C2- In airplanes, it could be months be
fore they get fired up and charged.=C2- Leaving a charger on an airplane
battery while it's installed is pretty easy, but then there are more and mo
re owners going to lithium ion batteries, which could pose more risk.
NOTE: check out the split lock washer on the power connector bolts.=C2-
This is not a good way to lock those nuts in vibrating equipment.
Henador Titzoff
From: Justin Jones <jmjones2000@mindspring.com>
To: aeroelectric-list@matronics.com
Sent: Saturday, June 25, 2016 12:04 PM
Subject: Re: AeroElectric-List: Master contactor temp?
I am not sure if it would work for a starter relay or not. One behavior I n
oticed is when I leave my LED instrument lights on and shut the battery off
(this solid state relay) the LEDs will dim down while shutting off (like d
imming them with a pwm). If I shut the LEDs off with their switch, they tur
n off instantly. Odd, but it doesn't seem to have any ill effects.=C2-
Justin
On Jun 25, 2016, at 10:40, Henador Titzoff <henador_titzoff@yahoo.com> wrot
e:
I wonder if this device can be used as a starter solenoid?=C2- The 300A c
ontinuous looks pretty good, and it has fins to dissipate heat.=C2- Max c
urrent would only flow for 2-10 seconds at a time, which means it will take
a heat breather before the next attempt.=C2- Our starters never use more
than 300A that I know of.
The data sheet says it has internal diode protection for inductive loads, b
ut there is a 150 msec turn off time.=C2- How different is this turn off
time from our accepted mechanical solenoids?
That burning a hole in the back pocket stuff may be cheap compared to a fai
lure of a mechanical device far away from home.
=C2-Henador Titzoff
From: Justin Jones <jmjones2000@mindspring.com>
To: aeroelectric-list@matronics.com
Sent: Saturday, June 25, 2016 9:45 AM
Subject: Re: AeroElectric-List: Master contactor temp?
ng.com>
At 300A continuous and 500A inrush for 1 second, this solid state battery m
aster relay has done me quite well for over 100 hours. No moving parts mean
s no arcing and no wearing out of contacts. It allows current to flow both
ways and works flawlessly as wired into Bob's 13/8 diagram.
The original application was for the medical package on an ambulance.
https://www.waytekwire.com/item/44407/Data-Panel-33034-Solid-State-Battery-
Disconnect/
Justin.
> On Jun 25, 2016, at 07:17, donjohnston <don@velocity-xl.com> wrote:
>
om>
>
> I was having the altimeter/transponder check done recently when I noticed
the master contactor was hot.=C2- Too hot to touch for very long.=C2-
Now I've never touched a master contactor before so I don't know what "norm
al" is (OAT was in the mid 90's).
>
> When I got back to the hangar, I turned on the master and checked it with
my point-and-shoot thermometer.=C2- I was seeing around 120 after about
5 minutes. I think it was a bit hotter while at the shop but I'm positive.
>
> Once back at home, I pulled up the data sheet for the White-Rodgers 90-90
7 solenoid and the only reference I can find for temperature is "Temperatur
e Range =93=93 -40=C2=B0F to 122=C2=B0F"
>
> I don't know if that range is ambient or device. If it's device, then I'm
right at the upper limit.
>
> Do I need to be worried?=C2- Time for a new master contactor?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=457424#457424
>
>
>
&ga href="http://www.matronics.com/Navigator?AeroElectric-List" target=
"_tp://forums.matronics.com/" target="_blank">http://forums.matronics.com
http://wiki.matronics.comp; =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2- -Matt Dralle, Li=========
Message 13
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| Subject: | Re: Master contactor temp? |
The bleed off hasn't been an issue. I have let it sit for 9 weeks before and
no noted battery degradation (PC680). I also have a turn coordinator on the
battery bus that spins down and behaves normally when the master is shut of
f.
Overall, I am extremely pleased with the performance.
Justin
> On Jun 25, 2016, at 11:54, Henador Titzoff <henador_titzoff@yahoo.com> wro
te:
>
> One of the problems with solid state devices is they will bleed current wh
en "OFF." The manufacturer of this device does not state the bleed current o
n the datasheet. They only state the max and max inrush currents as well as
the max voltage drop at 150A.
>
> The bleeding of current was never a factor when incandescent lights were u
sed, because they required higher magnitudes of current relative to LEDs and
went totally dim at milliamps of current. LED lights, on the other hand, a
re relatively efficient and use tens of milliamps of current when operating.
When "OFF," they still shine dimly at tens or hundreds of microamps. Perh
aps you can contact the relay manufacturer and ask when what the current ble
ed spec is. Their leaving it off may be an indication of a problem.
>
> This bleed is one good reason not to go with such a relay for both master a
nd starter unless you maintain your battery very well. In cars, we fire the
m up and charge them daily. In airplanes, it could be months before they ge
t fired up and charged. Leaving a charger on an airplane battery while it's
installed is pretty easy, but then there are more and more owners going to l
ithium ion batteries, which could pose more risk.
> NOTE: check out the split lock washer on the power connector bolts. This i
s not a good way to lock those nuts in vibrating equipment.
>
> Henador Titzoff
>
>
> From: Justin Jones <jmjones2000@mindspring.com>
> To: aeroelectric-list@matronics.com
> Sent: Saturday, June 25, 2016 12:04 PM
> Subject: Re: AeroElectric-List: Master contactor temp?
>
> I am not sure if it would work for a starter relay or not. One behavior I n
oticed is when I leave my LED instrument lights on and shut the battery off (
this solid state relay) the LEDs will dim down while shutting off (like dimm
ing them with a pwm). If I shut the LEDs off with their switch, they turn of
f instantly. Odd, but it doesn't seem to have any ill effects.
>
> Justin
>
>> On Jun 25, 2016, at 10:40, Henador Titzoff <henador_titzoff@yahoo.com> wr
ote:
>>
>> I wonder if this device can be used as a starter solenoid? The 300A cont
inuous looks pretty good, and it has fins to dissipate heat. Max current wo
uld only flow for 2-10 seconds at a time, which means it will take a heat br
eather before the next attempt. Our starters never use more than 300A that I
know of.
>>
>> The data sheet says it has internal diode protection for inductive loads,
but there is a 150 msec turn off time. How different is this turn off time
from our accepted mechanical solenoids?
>>
>> That burning a hole in the back pocket stuff may be cheap compared to a f
ailure of a mechanical device far away from home.
>>
>> Henador Titzoff
>>
>>
>> From: Justin Jones <jmjones2000@mindspring.com>
>> To: aeroelectric-list@matronics.com
>> Sent: Saturday, June 25, 2016 9:45 AM
>> Subject: Re: AeroElectric-List: Master contactor temp?
>>
ring.com>
>>
>> At 300A continuous and 500A inrush for 1 second, this solid state battery
master relay has done me quite well for over 100 hours. No moving parts mea
ns no arcing and no wearing out of contacts. It allows current to flow both w
ays and works flawlessly as wired into Bob's 13/8 diagram.
>>
>> The original application was for the medical package on an ambulance.
>>
>> https://www.waytekwire.com/item/44407/Data-Panel-33034-Solid-State-Batter
y-Disconnect/
>>
>> Justin.
>>
>> > On Jun 25, 2016, at 07:17, donjohnston <don@velocity-xl.com> wrote:
>> >
.com>
>> >
>> > I was having the altimeter/transponder check done recently when I notic
ed the master contactor was hot. Too hot to touch for very long. Now I've n
ever touched a master contactor before so I don't know what "normal" is (OAT
was in the mid 90's).
>> >
>> > When I got back to the hangar, I turned on the master and checked it wi
th my point-and-shoot thermometer. I was seeing around 120 after about 5 mi
nutes. I think it was a bit hotter while at the shop but I'm positive.
>> >
>> > Once back at home, I pulled up the data sheet for the White-Rodgers 90-
907 solenoid and the only reference I can find for temperature is "Temperatu
re Range =93=93 -40=C2=B0F to 122=C2=B0F"
>> >
>> > I don't know if that range is ambient or device. If it's device, then I
'm right at the upper limit.
>> >
>> > Do I need to be worried? Time for a new master contactor?
>> >
>> >
>> >
>> >
>> > Read this topic online here:
>> >
>> > http://forums.matronics.com/viewtopic.php?p=457424#457424
>> >
>> >
>> >
>> &ga href="http://www.matronics.com/Navigator?AeroElectric-List" target=
"_tp://forums.matronics.com/" target="_blank">http://forums.matronics.comh
ttp://wiki.matronics.comp; -Matt Dralle, Li======
===
>
>
Message 14
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| Subject: | Re: do I need to change my capacitor |
> Most of mine are hand drawn as I could never find a computer drawing program
that I could use effectively.
Try a free program called ExpressSCH. It is very easy to learn and use. The program
is intended for designing printed circuit boards. The company makes their
money by selling PCBs. The program has two parts, the schematic part and
the PCB layout part. Just the schematic part needs to be used to make a schematic
of your aircraft electrical system. Designs can be printed. I use a another
free program called CutePDF Writer to emulate a printer. It will save an
ExpressSCH design as a PDF file that can be shared and zoomed in on without blurring.
http://www.cutepdf.com/Products/CutePDF/writer.asp
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457438#457438
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