timer

[danny7299]

i need a timer that is

a) easy to use,

B) it needs to be on for 15 mins then off for 5 then on for 15 the off for 5 etc etc

any ideas?

 

[Lurch]

Mechanical immersion heater timer.

 

[danny7299]

has it got 5min intervuls? most only have 15 mins

 

[Lurch]

No, I was thinking that as I was typing, and I thought it had, but it hadn;t, and I knew that. Brain got confused and dropped the tens I think.

Smiths ETU2000, easy to operate and override, instructions don;t mention what the on\off times are.

 

[Evans Electric]

There used to be a Sangamo electro/mech timer , the dial was 1 hour so you could do 1 minute on 1 off.

 

[kme]

The Sangamo`s are still available - damn good timers, but expensive!

You could make a module, if it a consistent 15 /5 cycle?

Thinking.........

KME

 

[bob]

Cbus, PLC, computer control?

have a look here http://www.theben.de/index.html?L=1&no_cache=1 apparently very good equipment

bob

 

[Lurch]

I suppose if it's just like a watchdog timer then a timed\delayed pulsed relay would do it. Easiest solution if it will not need altering.

 

[SteveH37]

I use Theben or Merlin Din rail timers quite a bit when doing outside lighting for retail stores, main reason is the accuracy of the clock and self adjusting summer/winter settings. They usually do loads up to 16A resistive (10A Inductive) or you can slap a din rail contactor on if required. Can give part numbers if required.

 

[oldtimespark]

I have used this type timer for an on/off circuit similar to the one you are talking about to run a mixer paddle at high speed for a set length of time then at slow speed for a different time then repeats the cycle.

Please look at the data sheets here.

The outer dial sets one time and the inner dial sets the other.

My only other suggestion is a small siemens logo block or zeilo mini plcs, but you might need the programming tools.

 

[Apache]

What's it for, Dan?

 

[danny7299]

It's to turn on and off some steamers to make bread ...

I must say the ones that old timer suggested sound good ! I will look into them

 

[oldtimespark]

Hi Dan if the steamers are going to be run for long periods of time then it might be better to use a solid state relay controlled by the timer contacts

link to parts site

When contactor are switched frequently they are more prone to fail