Re: [APD] Metal Halide lights on timers

["S. Hieber" <shieber at yahoo_com>]

Hmmm, these complications seem like one more strike against
those beautiful but expensive things called MH lamps.

But, they really shouldn't be blowing out timers, should
they?

Scott H.
--- Deepak Brid <deepak_apd at yahoo_com> wrote:
>  
> Hi Andrew,
>        With reference to the mail above,I'd suggest to
> use heavy duty relay contacter.
> This is what I've in planned for my MH setup,6500K Osram
> . Currently using 4x36W PLL,6000K Osram. Though My timer
> has not given me any trouble so far, still I would like
> to plan for the future Setup & design my Electrical
> console.
>  
>        In the figure below the TIMER is used to switch on
> a STEP DOWN TRANSFORMER ,which  trigger a Heavy Duty
> Relay CONTACTER which in turn switches ON the LOAD.
>  
>                        Timer          Step Down         
> Heavy Duty           To High 
>                        OUT           Transformer     
> Relay contacter          LOAD 
>  
>                   ________________Live___________________
>                   |                  |                   
>                            |
>                   |    ______    |                       
>     ________     |
>         LIVE-------|         _|---            (8)  |
> (8)---------||          _ ||----|
>                       |        \_|--Live--------(8)  |
> (8)        ||          \_ ||------------>Live   
>                       |           |               (8)  |
> (8)         ||             ||                         MH
> Ballast
> NEUTRAL-------|______|--Neu--------(8)  |
> (8)---------||_______||------------->Neutral
> 
>                    |               |                     
>          ^IN    OUT^   |
> 
>                    |               |                     
>                             |
>                   
> |_________|_____Neutral_________________ |
>  
>  Legend:
>  
> 1. TIMER - Any suitable Real Clock / Cyclic timer.
> 2. Heavy Duty Relay CONCTACTER - This has to be chosen
> appropriately w.r.t  the LOAD. (Eg:U pick up a Contacter
> with operating Voltage24V .U can get a
> 2-pole,4-pole,6-pole contacter, choose as per the number
> of equipments you'd want to switch U can either use the
> contacter to switch the Live wire & bypass the relay for
> Neutral between the equipments OR use a both the L & N
> thrrough the Relay )(My Plan:Use a 6-Pole Contacter with
> 12V operating voltage)
> 3. STEP DOWN TRANSFORMER - The transformer should be able
> to energize the CONTACTER. (Eg: the transformer should be
> able to drive the Contacter (CAUTIO
> N: Overdriving the Contacter can reduce its life).(My
> plan: Get a Torodial Transformer,low on heat & losses,
> made to order 12V, ampere as per the contacter
> requirement)
> 4. LOAD - U can then use a MH, PLL,CFL or Regular tube
> lights.
>  
>     This way one does not need to invest on a high load
> timer & since the LOAD in on the CONTACTER the the life
> expectancy of the timer is drastically improved.


=====
S. Hieber

__________________________________
Do you Yahoo!?
Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes
http://hotjobs.sweepstakes.yahoo.com/signingbonus
_______________________________________________
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com
http://www.actwin.com/mailman/listinfo.cgi/aquatic-plants