Timer on reduced-frequency circuit
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Posted by Lacustral on July 31, 2007, 9:32 pm
Please log in for more thread options I'm thinking of using a variable speed control and a timer in series. Would a timer have trouble with the lowered frequency electricity from the speed control? WOuld an electronic timer run OK that way? Thanks Laura | ||||||||||||||||||||||
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Posted by Jasen Betts on August 1, 2007, 4:17 am
Please log in for more thread options maybe, but the easy fix is to put the timer before the speed control. you don't need to power the speed control when not using the fan. Bye. Jasen | ||||||||||||||||||||||
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Posted by Arfa Daily on August 1, 2007, 4:32 am
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> I'm thinking of using a variable speed control and a timer in series.
> Would a timer have trouble with the lowered frequency electricity from the > speed control? WOuld an electronic timer run OK that way? > > Thanks > Laura Firstly, a variable speed control does not affect the 'frequency' of the supply current. It does, however, have a profound effect on the waveshape, if it is electronic rather than passive, and this may well affect an electronic timer's ability to work correctly, as opposed to keeping time, which I presume is your reason for asking about frequency. If you put the timer ahead of the speed control, there will be no such issues, as the timer will only be fed with 'standard' line power, which it will then pass thru' to the speed control during one of its 'on' periods. Arfa | ||||||||||||||||||||||
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Posted by Sam Goldwasser on August 1, 2007, 8:17 am
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> I'm thinking of using a variable speed control and a timer in series.
> Would a timer have trouble with the lowered frequency electricity from the > speed control? WOuld an electronic timer run OK that way? I assume you mean a common thyristor phase control, not one that actually changes the frequency of the power, though the same comments apply. If you mean put the timer first which plugs into a wall socket and then the switched output of the timer goes to a variable speed control, there should be no problem. The timer will run off the unmodified power. However, if it is an electronic timer that is in series with the load ONLY then this is probably not a good idea unless the timer manufacturer specicially states that it is permissible. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. | ||||||||||||||||||||||
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Posted by Lacustral on August 1, 2007, 6:00 pm
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Sam Goldwasser (sam@red.seas.upenn.edu) wrote: >> I'm thinking of using a variable speed control and a timer in series.
>> Would a timer have trouble with the lowered frequency electricity from the >> speed control? WOuld an electronic timer run OK that way? >I assume you mean a common thyristor phase control, not one that actually
>changes the frequency of the power, though the same comments apply. Probably. A guy at an electric store said it changes the frequency, which sounded weird to me. But no, it would be an ordinary speed control. I vaguely remember reading about phase affecting power delivery in a physics book. >If you mean put the timer first which plugs into a wall socket and then the
>switched output of the timer goes to a variable speed control, there should >be no problem. The timer will run off the unmodified power. I see - that makes sense. Thanks Laura | ||||||||||||||||||||||
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> Would a timer have trouble with the lowered frequency electricity from the
> speed control? WOuld an electronic timer run OK that way?