RE: Relay light control problem

["'Simon Coates' simon@xxxxxxxxxxxxxxxxx [ukha_d]" <ukha_d@xxxxxxxxxxxxxxx>]

Simon,

=20

It=E2=80=99s caused by arcing at the relay contacts since you are
switching=
an inductive load.

Options:

Add bidirectional transient-voltage-suppression across the existing relay
o=
utput to snub the arcing.

Use you GPIO board relay to switch another relay that is inductive rated
i.=
e. a small contactor or solid state relay.

Change the fluorescent fittings for ones with high frequency ballasts.

=20

The best solution is probably adding the additional relay.

=20

HTH

=20

Simon

=20

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx]=20
Sent: 13 February 2017 08:14
To: UK Home Automation List <ukha_d@xxxxxxx>
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

---

"sorrowful, yet always rejoicing; poor, yet making many rich; having
nothin=
g, and yet possessing everything" 2 Cor 6:10





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Posted by: "Simon Coates" <simon@xxxxxxx>
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