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Topic Title: A stranger fault!
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Created On: 01 March 2013 11:50 PM
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 01 March 2013 11:50 PM
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SKElectrical

Posts: 910
Joined: 01 February 2009

Cust has two plinth heaters controlled by individual electronic timers.
The timers are sited right next to each other.
Timer A will start up fine when programmed.
When timer B clicks to start up.... BOTH controls (Timer A & Timer B) reset to blank screen.
The same occurs vice-versa.
Circuit does not trip and boost function is fine.

Now they probably aren't the most expensive timers, and must be the timers' electronics are "confusing" each other.. but that's all I could remark to cust.

Any ideas?
 02 March 2013 12:47 AM
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M.Joshi

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There could be some interaction from the pulse generated by the microelectronics to switch on in one of the timers radiating to the other - not sure why this would cause them both to reset though?

Have you contacted the manufacturer?

Are you able to separate the timers to test if the problem still occurs?

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 02 March 2013 08:29 AM
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OldSparky

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are they those cheap ones from cpc?

i had loads of trouble with those
 02 March 2013 10:22 AM
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Legh

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Now they probably aren't the most expensive timers, and must be the timers' electronics are "confusing" each other.. but that's all I could remark to cust.

Any ideas?


If it is EMI then try fitting a piece of metal capping or trunking lid between the two timers with a fly lead and croc clips to an earthing point.....

Legh

-------------------------
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 02 March 2013 12:38 PM
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M.Joshi

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Originally posted by: Legh

If it is EMI then try fitting a piece of metal capping or trunking lid between the two timers with a fly lead and croc clips to an earthing point.....

Legh


I thought about suggesting that but due to the close proximity and mains voltage involved, it may not be a safe permanent solution?

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M.I.E.T - Forfeited this due to The I.E.T's ridiculous membership rules!
 02 March 2013 02:34 PM
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Legh

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Originally posted by: M.Joshi

Originally posted by: Legh

If it is EMI then try fitting a piece of metal capping or trunking lid between the two timers with a fly lead and croc clips to an earthing point.....

Legh


I thought about suggesting that but due to the close proximity and mains voltage involved, it may not be a safe permanent solution?


Absolutely, I can imagine the disastrous aesthetic effect of a sheet of metal sticking out between two plastic timer controls with a croc clip attached.
If as OldSparky has stated that the programmers are rubbish to begin with then it would probably be worth investing in something more professional.
However, it would be satisfying to know a solution.

Legh

-------------------------
Why do we need Vernier Calipers when we have container ships?

http://www.leghrichardson.co.uk

"Science has overcome time and space. Well, Harvey has overcome not only time and space - but any objections."
 03 March 2013 06:50 AM
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ebee

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Well as a temporary measure to verify the cause of the problem might be an aid for a start.

Mr Faraday woulda been so pleased.

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Ebee (M I S P N)

Knotted cables cause Lumpy Lektrik
 09 April 2013 09:35 PM
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SKElectrical

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are they those cheap ones from cpc?


yes - £4 each, I believe.


Originally posted by: Legh

However, it would be satisfying to know a solution.


Re fit with mechanical time switches, they do have the limitation however of only being able to set identical daily programmes.

thanks
 09 April 2013 10:43 PM
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stateit

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Originally posted by: SKElectrical

Re fit with mechanical time switches, they do have the limitation however of only being able to set identical daily programmes.


You can get mechanical timers that are 7 day, 24 hr hour.

Most people do need reading glasses on to set them, or if shortsighted like me, you need to take your glasses off to set them.

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S George
http://www.sg-electrical.com
 10 April 2013 09:05 AM
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SKElectrical

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Originally posted by: stateit
You can get mechanical timers that are 7 day, 24 hr hour.

.


From where?
I looked high and low and couldn't find one.
 10 April 2013 09:14 AM
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stateit

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Originally posted by: SKElectrical

Originally posted by: stateit

You can get mechanical timers that are 7 day, 24 hr hour.



.




From where?

I looked high and low and couldn't find one.


For illustrative purposes there's these from TLC , but I've also used the 'flush' mount ones at a point in the past with a different and less confusing, tappet arrangement. Greenbrook I think.

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S George
http://www.sg-electrical.com
 10 April 2013 09:14 AM
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AJJewsbury

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 10 April 2013 09:15 AM
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AJJewsbury

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Bah, too slow!
- Andy.
 10 April 2013 09:15 AM
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stateit

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<SNAP> !

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S George
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 10 April 2013 09:22 AM
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SKElectrical

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Yes its okay for heating water application but I need switching in smaller increments, maximum of 15 minute intervals. I don't think that time switch does that.
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