From: "lehanover lehanover@aol.com" <flyrotary@lancaironline.net>
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Date: Tue, 13 Aug 2019 05:08:30 +0000 (UTC)
To: flyrotary@lancaironline.net
Message-ID: <922494569.3310058.1565672910776@mail.yahoo.com>
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Subject: Re: [FlyRotary] Re: thermocouple
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Will you reset the pump controls after each shut-down (overheat) or do you =
want to restart on cool-down?

Perhaps you would like a restart only when the pump is needed. If your pump=
 is a centrifugal and the load fluid will flow through it you can have a sa=
il switch to restart the pump. A pressure switch on the exit will keep it r=
unning until the sail switch drops out for lack of flow. Or a Klicks-on shu=
ts it off. All of this requires a three phase relay.
Most 3 phase motors=C2=A0 have a 30 to 60 degree temp rise when running. Th=
at would be 60 degrees above ambient temp and is normal for that pump motor=
. See data plate.

A Klickson will open at or near the specified temp but will reset just belo=
w that temp. Various types will allowdifferent delay times. The pumps are c=
ooled by ambient air and the media being pumped.

An engineer at the motor builder can send you a drawing of a typical contro=
l circuit, or even supply one.

Using a pump overheat to trip the circuit seems to me to shorten pump life.
But, I could be completely wrong.=C2=A0 =C2=A0Lynn E. Hanover
In a message dated 8/12/2019 10:37:29 AM Eastern Standard Time, flyrotary@l=
ancaironline.net writes:

Gents,=C2=A0 Nothing to do with flying, but you may be able to assist.=C2=
=A0 I=20
have numerous trash pumps that need a thermocouple linked to a 3 Phase=20
cutout.=C2=A0 Yes I can buy a stock unit for over $3000 each which to me is=
=20
as hot as the pump can get.=C2=A0 All I need is a switch that will cut out=
=20
the pump (power) when it overheats due to dry running.=C2=A0 If it doesn't=
=20
the pump then self destructs and $6000 later I am ready to go again.=C2=A0=
=C2=A0=C2=A0=20
I can however get replacement pumps from china for $500 but without the=20
cutout.

So simple heat sensor switch that will go open at preset temp high=20
setting, say 90 - 100 degrees=C2=A0 C .=C2=A0 Possibly single phase to disc=
onect 3=20
phase contactor.=C2=A0 Suggestions??>

Neil.

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<div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">Will you reset the pump controls after each shut-down (overheat) or do you want to restart on cool-down?<br></span></div>
<div><br></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">Perhaps you would like a restart only when the pump is needed. If your pump is a centrifugal and the load fluid will flow through it you can have a sail switch to restart the pump. A pressure switch on the exit will keep it running until the sail switch drops out for lack of flow. Or a Klicks-on shuts it off. All of this requires a three phase relay.</span></div>
<div><br></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">Most 3 phase motors&nbsp; have a 30 to 60 degree temp rise when running. That would be 60 degrees above ambient temp and is normal for that pump motor. See data plate.<br></span></div>
<div><br></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">A Klickson will open at or near the specified temp but will reset just below that temp. Various types will allow</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">different delay times. The pumps are cooled by ambient air and the media being pumped.<br></span></div>
<div><br></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">An engineer at the motor builder can send you a drawing of a typical control circuit, or even supply one.<br></span></div>
<div><br></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">Using a pump overheat to trip the circuit seems to me to shorten pump life.</span></div>
<div><br></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">But, I could be completely wrong.&nbsp; &nbsp;Lynn E. Hanover</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><br></span></div>
</div>
In a message dated 8/12/2019 10:37:29 AM Eastern Standard Time, flyrotary@lancaironline.net writes:
<div><br></div>
<div class="quotedReply">
<blockquote style="padding-left: 5px; margin-left: 5px; border-left: blue 2px solid;"><span style="background-color: transparent; color: #000000; font-family: Arial; font-size: small;">Gents,&nbsp; Nothing to do with flying, but you may be able to assist.&nbsp; I <br>have numerous trash pumps that need a thermocouple linked to a 3 Phase <br>cutout.&nbsp; Yes I can buy a stock unit for over $3000 each which to me is <br>as hot as the pump can get.&nbsp; All I need is a switch that will cut out <br>the pump (power) when it overheats due to dry running.&nbsp; If it doesn't <br>the pump then self destructs and $6000 later I am ready to go again.&nbsp;&nbsp;&nbsp; <br>I can however get replacement pumps from china for $500 but without the <br>cutout.<br><br>So simple heat sensor switch that will go open at preset temp high <br>setting, say 90 - 100 degrees&nbsp; C .&nbsp; Possibly single phase to disconect 3 <br>phase contactor.&nbsp; Suggestions??&gt;<br><br>Neil.</span></blockquote>
</div>
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