Today's Message Index:
----------------------
1. 03:58 PM - diode on starter contactor (Ken Ryan)
2. 04:10 PM - Re: diode on starter contactor (Alec Myers)
3. 04:16 PM - Re: diode on starter contactor (user9253)
4. 04:19 PM - Re: diode on starter contactor (Ken Ryan)
5. 04:34 PM - Re: diode on starter contactor (Charlie England)
6. 04:36 PM - Re: diode on starter contactor (Alec Myers)
7. 05:39 PM - Re: diode on starter contactor (Ken Ryan)
8. 09:50 PM - Re: diode on starter contactor (Bernie)
9. 11:00 PM - Re: diode on starter contactor (Bill Bear)
10. 11:27 PM - Re: diode on starter contactor (Bernie Willis)
Message 1
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Subject: | diode on starter contactor |
My starter contactor's coil gets its ground through the contactor's metal
case. Given that, does it make any sense to use a diode? If so, how would
that diode be implemented and how would it remain effective when the case
itself is the ground path?
Ken
Message 2
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Subject: | Re: diode on starter contactor |
Wire it across the coil, so from non ground terminal to ground terminal, so its
reverse polarized when the coil is energized. Then when power is removed, the
magnetic field collapses driving current through the diode and avoiding a large
back emf.
If you put it the wrong way round, dont worry, it will just disappear.
On Jan 17, 2018, at 18:56, Ken Ryan <keninalaska@gmail.com> wrote:
My starter contactor's coil gets its ground through the contactor's metal case.
Given that, does it make any sense to use a diode? If so, how would that diode
be implemented and how would it remain effective when the case itself is the
ground path?
Ken
Message 3
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Subject: | Re: diode on starter contactor |
An arc suppression diode should be connected directly across a coil. It is best
if the diode is located at the coil. If that is impractical for some reason,
then the diode can be located farther away as long as it is still connected
in parallel with the coil. The banded end of the diode must be connected to the
positive coil terminal and the other end of the diode connects to the negative
terminal of the coil. If the coil is internally connected to the case, then
the diode should be connected to the case or any convenient ground, assuming
that the case is grounded.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477380#477380
Message 4
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Subject: | Re: diode on starter contactor |
Alec, like I said in my original post, there is no ground terminal. Ground
is accomplished through the metal case.
On Wed, Jan 17, 2018 at 3:10 PM, Alec Myers <alec@alecmyers.com> wrote:
>
> Wire it across the coil, so from non ground terminal to ground terminal,
> so it=99s reverse polarized when the coil is energized. Then when p
ower is
> removed, the magnetic field collapses driving current through the diode a
nd
> avoiding a large back emf.
>
> If you put it the wrong way round, don=99t worry, it will just disa
ppear.
>
>
> On Jan 17, 2018, at 18:56, Ken Ryan <keninalaska@gmail.com> wrote:
>
> My starter contactor's coil gets its ground through the contactor's metal
> case. Given that, does it make any sense to use a diode? If so, how would
> that diode be implemented and how would it remain effective when the case
> itself is the ground path?
>
> Ken
>
>
===========
===========
===========
===========
===========
>
>
Message 5
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Subject: | Re: diode on starter contactor |
Think of the contactor's mounting screw as the ground terminal (it
actually *is* the ground terminal). So the banded end of the diode is
connected to the control terminal, and the unbanded end is connected to
one of the mounting screws. Or as others have said, any convenient
grounded terminal nearby. Note that you can solder or crimp a short
length of wire to either/both leads on the diode, and solder or crimp
ring terminals to the wire, if the diode's leads aren't long enough to
reach where they need to go. Just slip some heat shrink tubing, or even
wire insulation stripped off a bigger wire, over the exposed leads as
needed to keep the 'hot' end isolated from ground.
On 1/17/2018 6:18 PM, Ken Ryan wrote:
> Alec, like I said in my original post, there is no ground terminal.
> Ground is accomplished through the metal case.
>
> On Wed, Jan 17, 2018 at 3:10 PM, Alec Myers <alec@alecmyers.com
> <mailto:alec@alecmyers.com>> wrote:
>
> <alec@alecmyers.com <mailto:alec@alecmyers.com>>
>
> Wire it across the coil, so from non ground terminal to ground
> terminal, so its reverse polarized when the coil is energized.
> Then when power is removed, the magnetic field collapses driving
> current through the diode and avoiding a large back emf.
>
> If you put it the wrong way round, dont worry, it will just
> disappear.
>
>
> On Jan 17, 2018, at 18:56, Ken Ryan <keninalaska@gmail.com
> <mailto:keninalaska@gmail.com>> wrote:
>
> My starter contactor's coil gets its ground through the
> contactor's metal case. Given that, does it make any sense to use
> a diode? If so, how would that diode be implemented and how would
> it remain effective when the case itself is the ground path?
>
> Ken
>
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Message 6
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Subject: | Re: diode on starter contactor |
Use the mounting bolt then, with a ring terminal under the bolt head.
> On Jan 17, 2018, at 19:18, Ken Ryan <keninalaska@gmail.com> wrote:
>
> Alec, like I said in my original post, there is no ground terminal. Ground
is accomplished through the metal case.
>
>> On Wed, Jan 17, 2018 at 3:10 PM, Alec Myers <alec@alecmyers.com> wrote:
>>
>> Wire it across the coil, so from non ground terminal to ground terminal, s
o it=99s reverse polarized when the coil is energized. Then when power
is removed, the magnetic field collapses driving current through the diode a
nd avoiding a large back emf.
>>
>> If you put it the wrong way round, don=99t worry, it will just disa
ppear.
>>
>>
>>
>> On Jan 17, 2018, at 18:56, Ken Ryan <keninalaska@gmail.com> wrote:
>>
>> My starter contactor's coil gets its ground through the contactor's metal
case. Given that, does it make any sense to use a diode? If so, how would t
hat diode be implemented and how would it remain effective when the case its
elf is the ground path?
>>
>> Ken
>>
>>
>> =========================
============
>> -
>> Electric-List" rel="noreferrer" target="_blank">http://www.matronics.
com/Navigator?AeroElectric-List
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n
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>
Message 7
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Subject: | Re: diode on starter contactor |
Thanks everyone.
On Wed, Jan 17, 2018 at 3:35 PM, Alec Myers <alec@alecmyers.com> wrote:
> Use the mounting bolt then, with a ring terminal under the bolt head.
>
> On Jan 17, 2018, at 19:18, Ken Ryan <keninalaska@gmail.com> wrote:
>
> Alec, like I said in my original post, there is no ground terminal. Groun
d
> is accomplished through the metal case.
>
> On Wed, Jan 17, 2018 at 3:10 PM, Alec Myers <alec@alecmyers.com> wrote:
>
>>
>> Wire it across the coil, so from non ground terminal to ground terminal,
>> so it=99s reverse polarized when the coil is energized. Then when
power is
>> removed, the magnetic field collapses driving current through the diode
and
>> avoiding a large back emf.
>>
>> If you put it the wrong way round, don=99t worry, it will just dis
appear.
>>
>>
>>
>> On Jan 17, 2018, at 18:56, Ken Ryan <keninalaska@gmail.com> wrote:
>>
>> My starter contactor's coil gets its ground through the contactor's meta
l
>> case. Given that, does it make any sense to use a diode? If so, how woul
d
>> that diode be implemented and how would it remain effective when the cas
e
>> itself is the ground path?
>>
>> Ken
>>
>>
>> ========================
=============
>> -
>> Electric-List" rel="noreferrer" target="_blank">http://www.matronics
.com/
>> Navigator?AeroElectric-List
>> ========================
===========
>> FORUMS -
>> eferrer" target="_blank">http://forums.matronics.com
>> ========================
===========
>> WIKI -
>> errer" target="_blank">http://wiki.matronics.com
>> ========================
===========
>> b Site -
>> -Matt Dralle, List Admin.
>> rel="noreferrer" target="_blank">http://www.matronics.com/contributi
on
>> ========================
===========
>>
>>
>>
>>
>
Message 8
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Subject: | Re: diode on starter contactor |
I=99m trying to follow the diode and the starter sol. discussion. I mi
ssed the reason for the diode.
Thanks
Bernie
Sent from my iPhone
> On Jan 17, 2018, at 4:38 PM, Ken Ryan <keninalaska@gmail.com> wrote:
>
> Thanks everyone.
>
>
>> On Wed, Jan 17, 2018 at 3:35 PM, Alec Myers <alec@alecmyers.com> wrote:
>> Use the mounting bolt then, with a ring terminal under the bolt head.
>>
>>> On Jan 17, 2018, at 19:18, Ken Ryan <keninalaska@gmail.com> wrote:
>>>
>>> Alec, like I said in my original post, there is no ground terminal. Grou
nd is accomplished through the metal case.
>>>
>>>> On Wed, Jan 17, 2018 at 3:10 PM, Alec Myers <alec@alecmyers.com> wrote:
>
>>>>
>>>> Wire it across the coil, so from non ground terminal to ground terminal
, so it=99s reverse polarized when the coil is energized. Then when po
wer is removed, the magnetic field collapses driving current through the dio
de and avoiding a large back emf.
>>>>
>>>> If you put it the wrong way round, don=99t worry, it will just di
sappear.
>>>>
>>>>
>>>>
>>>> On Jan 17, 2018, at 18:56, Ken Ryan <keninalaska@gmail.com> wrote:
>>>>
>>>> My starter contactor's coil gets its ground through the contactor's met
al case. Given that, does it make any sense to use a diode? If so, how would
that diode be implemented and how would it remain effective when the case i
tself is the ground path?
>>>>
>>>> Ken
>>>>
>>>>
>>>> ============
>>>> -
>>>> Electric-List" rel="noreferrer" target="_blank">http://www.matronic
s.com/Navigator?AeroElectric-List
>>>> ==========
>>>> FORUMS -
>>>> eferrer" target="_blank">http://forums.matronics.com
>>>> ==========
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>>>> errer" target="_blank">http://wiki.matronics.com
>>>> ==========
>>>> b Site -
>>>> -Matt Dralle, List Admin.
>>>> rel="noreferrer" target="_blank">http://www.matronics.com/contribut
ion
>>>> ==========
>>>>
>>>>
>>>>
>>>
>
Message 9
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Subject: | Re: diode on starter contactor |
Bernie,
As I understand it, when the solenoid is deenergized, a voltage surge
peak passes through the circuit which ages the solenoid contacts. The
diode prevents the passage of the surge current and lengthens the life
of the solenoid contacts. The diode band end is connected to the
positive side of the solenoid contractor and the other side of the diode
is connected to ground at the solenoid.
Bill
> On Jan 17, 2018, at 20:49, Bernie <arcticarrow@gmail.com> wrote:
>
> I=99m trying to follow the diode and the starter sol.
discussion. I missed the reason for the diode.
>
> Thanks
> Bernie
>
> Sent from my iPhone
>
> On Jan 17, 2018, at 4:38 PM, Ken Ryan <keninalaska@gmail.com
<mailto:keninalaska@gmail.com>> wrote:
>
>> Thanks everyone.
>>
>>
>> On Wed, Jan 17, 2018 at 3:35 PM, Alec Myers <alec@alecmyers.com
<mailto:alec@alecmyers.com>> wrote:
>> Use the mounting bolt then, with a ring terminal under the bolt head.
>>
>> On Jan 17, 2018, at 19:18, Ken Ryan <keninalaska@gmail.com
<mailto:keninalaska@gmail.com>> wrote:
>>
>>> Alec, like I said in my original post, there is no ground terminal.
Ground is accomplished through the metal case.
>>>
>>> On Wed, Jan 17, 2018 at 3:10 PM, Alec Myers <alec@alecmyers.com
<mailto:alec@alecmyers.com>> wrote:
<alec@alecmyers.com <mailto:alec@alecmyers.com>>
>>>
>>> Wire it across the coil, so from non ground terminal to ground
terminal, so it=99s reverse polarized when the coil is energized.
Then when power is removed, the magnetic field collapses driving current
through the diode and avoiding a large back emf.
>>>
>>> If you put it the wrong way round, don=99t worry, it will just
disappear.
>>>
>>>
>>>
>>> On Jan 17, 2018, at 18:56, Ken Ryan <keninalaska@gmail.com
<mailto:keninalaska@gmail.com>> wrote:
>>>
>>> My starter contactor's coil gets its ground through the contactor's
metal case. Given that, does it make any sense to use a diode? If so,
how would that diode be implemented and how would it remain effective
when the case itself is the ground path?
>>>
>>> Ken
>>>
>>>
>>> ============
>>> -
>>> Electric-List" rel="noreferrer"
target="_blank">http://www.matronics.com/
<http://www.matronics.com/>Navigator?AeroElectric-List
>>> ==========
>>> FORUMS -
>>> eferrer" target="_blank">http://forums.matronics.com
<http://forums.matronics.com/>
>>> ==========
>>> WIKI -
>>> errer" target="_blank">http://wiki.matronics.com
<http://wiki.matronics.com/>
>>> ==========
>>> b Site -
>>> -Matt Dralle, List Admin.
>>> rel="noreferrer" target="_blank">http://www.matronics.com/
<http://www.matronics.com/>contribution
>>> ==========
>>>
>>>
>>>
>>>
>>
Message 10
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Subject: | Re: diode on starter contactor |
Bill,
That refinement to the traditional circuit makes sense. Is there any
particular diode?
Thanks,
Bernie
> On Jan 17, 2018, at 9:59 PM, Bill Bear <beartrax@mtaonline.net> wrote:
>
> Bernie,
>
> As I understand it, when the solenoid is deenergized, a voltage surge
peak passes through the circuit which ages the solenoid contacts. The
diode prevents the passage of the surge current and lengthens the life
of the solenoid contacts. The diode band end is connected to the
positive side of the solenoid contractor and the other side of the diode
is connected to ground at the solenoid.
>
> Bill
>
>
>> On Jan 17, 2018, at 20:49, Bernie <arcticarrow@gmail.com
<mailto:arcticarrow@gmail.com>> wrote:
>>
>> I=99m trying to follow the diode and the starter sol.
discussion. I missed the reason for the diode.
>>
>> Thanks
>> Bernie
>>
>> Sent from my iPhone
>>
>> On Jan 17, 2018, at 4:38 PM, Ken Ryan <keninalaska@gmail.com
<mailto:keninalaska@gmail.com>> wrote:
>>
>>> Thanks everyone.
>>>
>>>
>>> On Wed, Jan 17, 2018 at 3:35 PM, Alec Myers <alec@alecmyers.com
<mailto:alec@alecmyers.com>> wrote:
>>> Use the mounting bolt then, with a ring terminal under the bolt
head.
>>>
>>> On Jan 17, 2018, at 19:18, Ken Ryan <keninalaska@gmail.com
<mailto:keninalaska@gmail.com>> wrote:
>>>
>>>> Alec, like I said in my original post, there is no ground terminal.
Ground is accomplished through the metal case.
>>>>
>>>> On Wed, Jan 17, 2018 at 3:10 PM, Alec Myers <alec@alecmyers.com
<mailto:alec@alecmyers.com>> wrote:
<alec@alecmyers.com <mailto:alec@alecmyers.com>>
>>>>
>>>> Wire it across the coil, so from non ground terminal to ground
terminal, so it=99s reverse polarized when the coil is energized.
Then when power is removed, the magnetic field collapses driving current
through the diode and avoiding a large back emf.
>>>>
>>>> If you put it the wrong way round, don=99t worry, it will
just disappear.
>>>>
>>>>
>>>>
>>>> On Jan 17, 2018, at 18:56, Ken Ryan <keninalaska@gmail.com
<mailto:keninalaska@gmail.com>> wrote:
>>>>
>>>> My starter contactor's coil gets its ground through the contactor's
metal case. Given that, does it make any sense to use a diode? If so,
how would that diode be implemented and how would it remain effective
when the case itself is the ground path?
>>>>
>>>> Ken
>>>>
>>>>
>>>> ============
>>>> -
>>>> Electric-List" rel="noreferrer"
target="_blank">http://www.matronics.com/
<http://www.matronics.com/>Navigator?AeroElectric-List
>>>> ==========
>>>> FORUMS -
>>>> eferrer" target="_blank">http://forums.matronics.com
<http://forums.matronics.com/>
>>>> ==========
>>>> WIKI -
>>>> errer" target="_blank">http://wiki.matronics.com
<http://wiki.matronics.com/>
>>>> ==========
>>>> b Site -
>>>> -Matt Dralle, List Admin.
>>>> rel="noreferrer" target="_blank">http://www.matronics.com/
<http://www.matronics.com/>contribution
>>>> ==========
>>>>
>>>>
>>>>
>>>>
>>>
>
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