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One moment, please, it is the cathode end that has the stripe.=C2=A0 Conne=
ct that to the positive terminal.
Connecting a diode across the coil will do noting for the contacts burning =
up.=C2=A0 It will protect the temp switch, however.=C2=A0 Placing the diode=
across the contacts will quench the arc there.=C2=A0=20
Another possibility, one that I use regularly, a varistor designed for just=
such an application.=C2=A0 Something like this:
https://www.digikey.com/en/products/detail/bourns-inc/MOV-10D220KTR/2407603
This part is not polarity sensitive and will limit the voltage across the c=
ontacts to a point where no spark will be generated.
=20
Dave=20
=20
=20
-----Original Message-----
From: ronald.olds@mchsi.com
To: keithstewart@bell.net
Cc: triumphs@autox.team.net
Sent: Thu, Jun 16, 2022 12:02 pm
Subject: Re: [TR] Electric Fan Relay
Keith,
I would recommend connecting a 1N4004 diode across the positive an the grou=
nd terminals of the relay coil. Connect the cathode end of the diode to the=
positive terminal and the anode end (the end of the diode with the line om=
it) to the negative terminal. this will have no effect when the relay is e=
nergized.=C2=A0 When a relay is denergized it generates a spark which can b=
urn the points. The diode will allow this spark to travel through the diode=
and=C2=A0 dissipate.
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Connect to relay neg=
ative connection.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Connect to the relay positive terminal.
Diodes should be across the terminals of all relays and solenoids.
Ronald Olds
From: keithstewart@bell.net
To: triumphs@autox.team.net
Sent: Thursday, June 16, 2022 11:38:04 AM
Subject: [TR] Electric Fan Relay
I have a 62 TR4 with Trim Line electric fan, Derale fan controller, 30 amp =
fuse, and 30 amp NAPA relay. In the past 5 or 6 years, I have likely replac=
ed the relay six or seven times. The wiring seems pretty straight forward a=
nd all seems in order. I really have no idea where to look next. Any sugges=
tions?=20
=20
Keith Stewart=20
keithstewart@bell.net=20
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<div style="color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <font size="3">One moment, please, it is the cathode end that has the
stripe. Connect that to the positive terminal.<br>
</font></div>
<div><br>
</div>
<div><font size="3">Connecting a diode across the coil will do noting for the
contacts burning up. It will protect the temp switch, however.
Placing the diode across the contacts will quench the arc there. <br>
</font></div>
<div><br>
</div>
<div><font size="3">Another possibility, one that I use regularly, a varistor
designed for just such an application. Something like this:</font></div>
<div><br>
</div>
<div><font
size="3">https://www.digikey.com/en/products/detail/bourns-inc/MOV-10D220KTR/2407603</font></div>
<div><br>
</div>
<div><font size="3">This part is not polarity sensitive and will limit the
voltage across the contacts to a point where no spark will be
generated.</font></div>
<div><br>
</div>
<div><br>
</div>
<div> <br>
</div>
<div style="clear:both">
<div style="color:black;font:12pt Arial, Helvetica, sans-serif;">
<div><font size="4">Dave <br>
</font></div>
<div><font size="3"><span style="font-size: 10pt; color: black;"><br>
</span></font></div>
<br>
</div>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style="font-family:arial,helvetica;font-size:10pt;color:black"><font
size="2">-----Original Message-----<br>
From: ronald.olds@mchsi.com<br>
To: keithstewart@bell.net<br>
Cc: triumphs@autox.team.net<br>
Sent: Thu, Jun 16, 2022 12:02 pm<br>
Subject: Re: [TR] Electric Fan Relay<br>
<br>
<div id="yiv6004001263">
<div>
<div style="font-family:Times New Roman;font-size:12pt;color:#000000;">
<div>Keith,<br clear="none"><br clear="none">I would recommend connecting a
1N4004 diode across the positive an the ground terminals of the relay coil.
Connect the cathode end of the diode to the positive terminal and the anode end
(the end of the diode with the line om it) to the negative terminal. this will
have no effect when the relay is energized. When a relay is denergized it
generates a spark which can burn the points. The diode will allow this spark to
travel through the diode and dissipate.<br clear="none"></div>
<div>
<img
src="https://cdn.sparkfun.com/assets/d/6/b/f/a/5171b6bece395ff53c000000.PNG";
alt="https://cdn.sparkfun.com/assets/d/6/b/f/a/5171b6bece395ff53c000000.PNG";>
</div>
<div>
Connect to relay negative
connection.
Connect to the relay positive terminal.<br clear="none"></div>
<div><br clear="none"></div>
<div>Diodes should be across the terminals of all relays and solenoids.<br
clear="none"></div>
<div><br clear="none"></div>
<div>Ronald Olds<br clear="none"></div>
<div><br clear="none"></div>
<hr id="yiv6004001263zwchr">
<div id="yiv6004001263yqtfd60417" class="yiv6004001263yqt2271828162">
<div><b>From: </b>keithstewart@bell.net<br clear="none"><b>To:
</b>triumphs@autox.team.net<br clear="none"><b>Sent: </b>Thursday, June 16,
2022 11:38:04 AM<br clear="none"><b>Subject: </b>[TR] Electric Fan Relay<br
clear="none"></div>
<div><br clear="none"></div>
</div>
<div>
<div id="yiv6004001263yqtfd09725" class="yiv6004001263yqt2271828162">I have a
62 TR4 with Trim Line electric fan, Derale fan controller, 30 amp fuse, and 30
amp NAPA relay. In the past 5 or 6 years, I have likely replaced the relay six
or seven times. The wiring seems pretty straight forward and all seems in
order. I really have no idea where to look next. Any suggestions? <br
clear="none"><br clear="none"> <br clear="none"><br clear="none">Keith Stewart
<br clear="none"><br clear="none">keithstewart@bell.net <br clear="none"><br
clear="none"><br clear="none"></div>
</div>
</div>
</div>
</div>
</font></div>
</div>
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Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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