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Re: Relay light control problem
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Hi Dave,
the relays are rated at 5A for 220V.
The lights being controlled have two 70W tubes
Regards
Simon
---
"sorrowful, yet always rejoicing; poor, yet making many rich; having
nothing, and yet possessing everything" 2 Cor 6:10
On 13 February 2017 at 08:36, 'Dave McLaughlin' dave@xxxxxxx
[ukha_d] <ukha_d@xxxxxxx> wrote:
>
>
> Hi Simon,
>
>
>
> What is the rating of the relay at 220Vac?
>
>
>
> What is the power of the lights themselves?
>
>
>
> It is possible that the relay rating is too low.
>
>
>
> Fluorescent lamps appear as an inductive load to the relay due to the
> ballast so there is a higher inrush current.
>
>
>
> An option is to fit a snubber across the relay contacts.
>
>
>
> Dave=E2=80=A6
>
> ---
>
> Very funny Scotty, now beam down my clothes=E2=80=A6
>
> ---
>
>
>
> *From:* ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx]
> *Sent:* 13 February 2017 15:14
> *To:* UK Home Automation List
> *Subject:* [ukha_d] Relay light control problem
>
>
>
>
>
> Hi
>
>
>
> I've recently been trying to use relays to control 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 ones you see all over
eBay=
,
> with GPIO level inputs for control by a Raspberry Pi etc.
>
>
>
> 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 go off, the lights stay on.
>
>
>
> I initially thought it was a faulty relay, but I ordered a replacement
an=
d
> fitted them on Saturday, and now one side is stuck again.
>
>
>
> Is it something to do with the load of these fluorescent tubes? Any
ideas=
?
>
>
> Regards
>
> Simon
>
> ---
>
>
>=20
>
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<div dir=3D"ltr">Hi
Dave,=C2=A0<div><br></div><div>the relays are rated
at =
5A =C2=A0for
220V.</div><div><br></div><div>The lights
being controlled hav=
e two 70W
tubes</div><div><br></div><div><br></div></div><div
class=3D"gmai=
l_extra"><br clear=3D"all"><div><div
class=3D"gmail_signature" data-smartma=
il=3D"gmail_signature"><div
dir=3D"ltr"><div><div
dir=3D"ltr"><div><div dir=
=3D"ltr"><div><div
dir=3D"ltr">Regards<br><br>Simon<div>---</div><div><div
=
style=3D"margin-bottom:0px;margin-left:0px;padding-bottom:5px"><div
style=
=3D"overflow:hidden"><div
dir=3D"ltr"><div><div
dir=3D"ltr"><span style=3D"=
font-size:13px;color:rgb(51,51,51);font-family:'lucida
grande',taho=
ma,verdana,arial,sans-serif;line-height:17px">"</span><font
color=3D"#=
333333" face=3D"lucida grande, tahoma, verdana, arial,
sans-serif"><span st=
yle=3D"font-size:13px;line-height:17px">sorrowful, yet always
rejoicing; po=
or, yet making many rich; having nothing, and yet possessing
everything&quo=
t; 2 Cor 6:10</span></font></div></div><div
style=3D"font-size:13px"></div>=
</div></div></div><div
style=3D"font-size:13px"></div></div></div></div></d=
iv></div></div></div></div></div></div>
<br><div class=3D"gmail_quote">On 13 February 2017 at
08:36, 'Dave McLa=
ughlin' <a href=3D"mailto:dave@xxxxxxx";>dave@embeddedcom=
puter.co.uk</a> [ukha_d] <span
dir=3D"ltr"><<a href=3D"mailto:ukha_d@yah=
oogroups.com"
target=3D"_blank">ukha_d@xxxxxxx</a>></span>
wrote=
:<br><blockquote class=3D"gmail_quote"
style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">
=20=20=20=20=20=20=20=20
<div bgcolor=3D"white" lang=3D"EN-GB"
link=3D"blue" vlink=3D"purple">
<br><br>
<div class=3D"m_-2261459137156294625WordSection1"><p
class=3D"MsoNormal"><s=
pan
style=3D"font-size:10.0pt;font-family:"Verdana","sans-se=
rif"">Hi
Simon,<u></u><u></u></span></p><p
class=3D"MsoNormal"><span s=
tyle=3D"font-size:10.0pt;font-family:"Verdana","sans-serif&q=
uot;"><u></u>=C2=A0<u></u></span></p><p
class=3D"MsoNormal"><span style=3D"=
font-size:10.0pt;font-family:"Verdana","sans-serif"">Wh=
at is the rating of the relay at
220Vac?<u></u><u></u></span></p><p
class=
=3D"MsoNormal"><span
style=3D"font-size:10.0pt;font-family:"Verdana&qu=
ot;,"sans-serif""><u></u>=C2=A0<u></u></span></p><p
class=3D"MsoN=
ormal"><span
style=3D"font-size:10.0pt;font-family:"Verdana",&quo=
t;sans-serif"">What is the power of the lights
themselves?<u></u><u></=
u></span></p><p class=3D"MsoNormal"><span
style=3D"font-size:10.0pt;font-fa=
mily:"Verdana","sans-serif""><u></u>=C2=A0<u></u></span=
></p><p class=3D"MsoNormal"><span
style=3D"font-size:10.0pt;font-family:&qu=
ot;Verdana","sans-serif"">It is possible
that the relay rati=
ng is too
low.<u></u><u></u></span></p><p
class=3D"MsoNormal"><span style=
=3D"font-size:10.0pt;font-family:"Verdana","sans-serif"=
"><u></u>=C2=A0<u></u></span></p><p
class=3D"MsoNormal"><span style=3D"font=
-size:10.0pt;font-family:"Verdana","sans-serif"">Fluore=
scent lamps appear as an inductive load to the relay due to the ballast so
=
there is a higher inrush
current.<u></u><u></u></span></p><p
class=3D"MsoNo=
rmal"><span
style=3D"font-size:10.0pt;font-family:"Verdana","=
;sans-serif""><u></u>=C2=A0<u></u></span></p><p
class=3D"MsoNormal"><s=
pan
style=3D"font-size:10.0pt;font-family:"Verdana","sans-se=
rif"">An option is to fit a snubber across the relay
contacts.<u></u><=
u></u></span></p><p
class=3D"MsoNormal"><span
style=3D"font-size:10.0pt;fon=
t-family:"Verdana","sans-serif""><u></u>=C2=A0<u></u></=
span></p><p class=3D"MsoNormal"><span
style=3D"font-size:10.0pt;font-family=
:"Verdana","sans-serif"">Dave=E2=80=A6<u></u><u></u></s=
pan></p><div><p class=3D"MsoNormal"><span
lang=3D"EN-US" style=3D"font-size=
:11.0pt;font-family:"Calibri","sans-serif"">---<u></u><=
u></u></span></p><p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-=
size:11.0pt;font-family:"Calibri","sans-serif"">Very
fu=
nny Scotty, now beam down my
clothes=E2=80=A6<u></u><u></u></span></p><p
cl=
ass=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-size:11.0pt;font-famil=
y:"Calibri","sans-serif"">---<u></u><u></u></span></p><=
/div><p class=3D"MsoNormal"><span
style=3D"font-size:10.0pt;font-family:&qu=
ot;Verdana","sans-serif""><u></u>=C2=A0<u></u></span></p><di=
v><div style=3D"border:none;border-top:solid #b5c4df
1.0pt;padding:3.0pt 0c=
m 0cm 0cm"><p class=3D"MsoNormal"><b><span
lang=3D"EN-US" style=3D"font-siz=
e:10.0pt;font-family:"Tahoma","sans-serif"">From:</span=
></b><span lang=3D"EN-US"
style=3D"font-size:10.0pt;font-family:"Tahom=
a","sans-serif""> <a href=3D"mailto:ukha_d@xxxxxxx"; =
target=3D"_blank">ukha_d@xxxxxxx</a> [mailto:<a
href=3D"mailto:ukha=
_d@xxxxxxx"
target=3D"_blank">ukha_d@xxxxxxx</a><wbr>]
<br>=
<b>Sent:</b> 13 February 2017 15:14<span
class=3D""><br><b>To:</b> UK Home =
Automation List<br></span><span
class=3D""><b>Subject:</b> [ukha_d] Relay l=
ight control
problem<u></u><u></u></span></span></p></div></div><p
class=3D=
"MsoNormal"><u></u>=C2=A0<u></u></p><p
class=3D"MsoNormal">=C2=A0 <u></u><u=
></u></p><div
id=3D"m_-2261459137156294625ygrp-mlmsg"><div
id=3D"m_-2261459=
137156294625ygrp-msg"><div
id=3D"m_-2261459137156294625ygrp-text"><div><p c=
lass=3D"MsoNormal">Hi=C2=A0<u></u><u></u></p><span
class=3D""><div><p class=
=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p
class=3D"MsoNormal">I&=
#39;ve recently been trying to use relays to control the internal lights
in=
my garage, but I've been having issues. They are fluorescent tubes,
tw=
o controlled by each relay. The relays are those ones you see all over
eBay=
, with GPIO level inputs for control by a Raspberry Pi
etc.<u></u><u></u></=
p></div><div><p
class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p
c=
lass=3D"MsoNormal">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 go off, the =
lights stay
on.<u></u><u></u></p></div><div><p
class=3D"MsoNormal"><u></u>=
=C2=A0<u></u></p></div><div><p
class=3D"MsoNormal">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.<u></u><u></u></p></div><div><p
class=3D"M=
soNormal"><u></u>=C2=A0<u></u></p></div><div><p
class=3D"MsoNormal">Is it s=
omething to do with the load of these fluorescent tubes? Any
ideas?<u></u><=
u></u></p></div><div><p
class=3D"MsoNormal"><br
clear=3D"all"><u></u><u></u=
></p><div><div><div><div><div><div><div><div><div><p
class=3D"MsoNormal">Re=
gards<br><br>Simon<u></u><u></u></p><div><p
class=3D"MsoNormal">---<u></u><=
u></u></p></div></div></div></div></div></div></div></div></div></div></div=
></span></div></div></div></div></div>
<br>
<br>
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