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RE: Relay light control problem
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Hi Simon,
=20
What is the rating of the relay at 220Vac?
=20
What is the power of the lights themselves?
=20
It is possible that the relay rating is too low.
=20
Fluorescent lamps appear as an inductive load to the relay due to the
balla=
st so there is a higher inrush current.
=20
An option is to fit a snubber across the relay contacts.
=20
Dave=E2=80=A6
---
Very funny Scotty, now beam down my clothes=E2=80=A6
---
=20
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx]=20
Sent: 13 February 2017 15:14
To: UK Home Automation List
Subject: [ukha_d] Relay light control problem
=20
=20=20
Hi=20
=20
I've recently been trying to use relays to control the internal lights in
m=
y garage, but I've been having issues. They are fluorescent tubes, two
cont=
rolled by each relay. The relays are those ones you see all over eBay,
with=
GPIO level inputs for control by a Raspberry Pi etc.
=20
The issue I've had is that after a while they simply stick, always on. So
w=
hen the pi sends the signal for them to go off, the lights stay on.
=20
I initially thought it was a faulty relay, but I ordered a replacement and
=
fitted them on Saturday, and now one side is stuck again.
=20
Is it something to do with the load of these fluorescent tubes? Any ideas?
Regards
Simon
---
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<div class=3DWordSection1><p class=3DMsoNormal><span
style=3D'font-size:10.=
0pt;font-family:"Verdana","sans-serif"'>Hi
Simon,<o:p></o:p></span></p><p c=
lass=3DMsoNormal><span
style=3D'font-size:10.0pt;font-family:"Verdana","san=
s-serif"'><o:p> </o:p></span></p><p
class=3DMsoNormal><span style=3D'f=
ont-size:10.0pt;font-family:"Verdana","sans-serif"'>What
is the rating of t=
he relay at 220Vac?<o:p></o:p></span></p><p
class=3DMsoNormal><span style=
=3D'font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p><=
/span></p><p class=3DMsoNormal><span
style=3D'font-size:10.0pt;font-family:=
"Verdana","sans-serif"'>What is the power of the
lights themselves?<o:p></o=
:p></span></p><p class=3DMsoNormal><span
style=3D'font-size:10.0pt;font-fam=
ily:"Verdana","sans-serif"'><o:p> </o:p></span></p><p
class=3DMsoNorma=
l><span
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif"'>It
is=
possible that the relay rating is too
low.<o:p></o:p></span></p><p class=
=3DMsoNormal><span
style=3D'font-size:10.0pt;font-family:"Verdana","sans-se=
rif"'><o:p> </o:p></span></p><p
class=3DMsoNormal><span style=3D'font-=
size:10.0pt;font-family:"Verdana","sans-serif"'>Fluorescent
lamps appear as=
an inductive load to the relay due to the ballast so there is a higher inr=
ush current.<o:p></o:p></span></p><p
class=3DMsoNormal><span style=3D'font-=
size:10.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p=
><p class=3DMsoNormal><span
style=3D'font-size:10.0pt;font-family:"Verdana"=
,"sans-serif"'>An option is to fit a snubber across the relay
contacts.<o:p=
></o:p></span></p><p class=3DMsoNormal><span
style=3D'font-size:10.0pt;font=
-family:"Verdana","sans-serif"'><o:p> </o:p></span></p><p
class=3DMsoN=
ormal><span
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif"'>D=
ave=E2=80=A6<o:p></o:p></span></p><div><p
class=3DMsoNormal><span lang=3DEN=
-US
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>---<o:p><=
/o:p></span></p><p class=3DMsoNormal><span
lang=3DEN-US style=3D'font-size:=
11.0pt;font-family:"Calibri","sans-serif"'>Very
funny Scotty, now beam down=
my clothes=E2=80=A6<o:p></o:p></span></p><p
class=3DMsoNormal><span lang=
=3DEN-US
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>---<=
o:p></o:p></span></p></div><p
class=3DMsoNormal><span style=3D'font-size:10=
.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p><div><=
div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm
0=
cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US
style=3D'font-size:10.0p=
t;font-family:"Tahoma","sans-serif"'>From:</span></b><span
lang=3DEN-US sty=
le=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
ukha_d@yahoogrou=
ps.com [mailto:ukha_d@xxxxxxx]
<br><b>Sent:</b> 13 February 2017 15=
:14<br><b>To:</b> UK Home Automation
List<br><b>Subject:</b> [ukha_d] Relay=
light control
problem<o:p></o:p></span></p></div></div><p
class=3DMsoNorma=
l><o:p> </o:p></p><p
class=3DMsoNormal> <o:p></o:p></p><div
id=
=3Dygrp-mlmsg><div id=3Dygrp-msg><div
id=3Dygrp-text><div><p class=3DMsoNor=
mal>Hi <o:p></o:p></p><div><p
class=3DMsoNormal><o:p> </o:p></p><=
/div><div><p class=3DMsoNormal>I've recently been trying to
use relays to c=
ontrol the internal lights in my garage, but I've been having issues. They
=
are fluorescent tubes, two controlled by each relay. The relays are those
o=
nes you see all over eBay, with GPIO level inputs for control by a
Raspberr=
y Pi etc.<o:p></o:p></p></div><div><p
class=3DMsoNormal><o:p> </o:p></=
p></div><div><p class=3DMsoNormal>The issue I've had
is that after a while =
they simply stick, always on. So when the pi sends the signal for them to
g=
o off, the lights stay
on.<o:p></o:p></p></div><div><p
class=3DMsoNormal><o=
:p> </o:p></p></div><div><p
class=3DMsoNormal>I initially thought it w=
as a faulty relay, but I ordered a replacement and fitted them on
Saturday,=
and now one side is stuck
again.<o:p></o:p></p></div><div><p
class=3DMsoNo=
rmal><o:p> </o:p></p></div><div><p
class=3DMsoNormal>Is it something t=
o do with the load of these fluorescent tubes? Any
ideas?<o:p></o:p></p></d=
iv><div><p class=3DMsoNormal><br
clear=3Dall><o:p></o:p></p><div><div><div>=
<div><div><div><div><div><div><p
class=3DMsoNormal>Regards<br><br>Simon<o:p=
></o:p></p><div><p
class=3DMsoNormal>---<o:p></o:p></p></div></div></div></=
div></div></div></div></div></div></div></div></div></div></div></div></div=
>
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