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Navitron Renewable Energy and Sustainability Forum > BIOMASS > General > 3ph timers
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Author Topic: 3ph timers  (Read 2755 times)
michiel
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Gaia
« on: January 23, 2010, 05:45:19 PM »
Does anyone know where I can get a 3ph timer?
A simple 24hr on/of controller, switching a 3ph, 850W pump.

I have spent the last hour ontnet, not found a single unit!

Michiel
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knighty
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« Reply #1 on: January 23, 2010, 05:56:52 PM »
just use a single phase one and then a 3 phase contactor Wink


get the contactor from ebay.... it'll be much cheaper !!!
(£5ebay vs £90new)

something like THIS

it's just like a big relay....

power in at one end, power out at the other

then a negative connection
and a positive conection powered by your timer

:-)
« Last Edit: January 23, 2010, 05:59:02 PM by knighty » Logged
johnrae
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« Reply #2 on: January 23, 2010, 06:37:28 PM »
Bear in mind that, if you use a single phase timer (230 volts) to drive the 3 phase contactor (415 volts), you'll need neutral supply.  The coil on the contactor could be either 415 volts or 230 volts.  If the latter then it'll also need a neutral supply.  Jack
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michiel
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Gaia
« Reply #3 on: January 23, 2010, 06:50:11 PM »
So, if I get a 3ph (415V) contactor with a 230V coil, the Live + Neutral coming from the timer supply the coil.
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johnrae
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« Reply #4 on: January 23, 2010, 07:14:18 PM »
you've got it !
jack
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michiel
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Gaia
« Reply #5 on: January 23, 2010, 07:17:07 PM »
Thanks Jack / Knighty

I've already got a timer, so should get job done for under £15. Great

Michiel Smiley
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11kW Gaia-wind, 3.85kW PV mounted on 3x trackers, Borehole fed 32kW GSHP, 10m^2 Flat plate Solar, 100x58mm (Navitron) ET's, 1000Lt heat store, WVO Lister CS CHP, WVO powered VW Caddy, 4 chickens and 3 ducks, (edit, ducks no more, taken by fox!)
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