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Topic: SSR question (Read 485 times) previous topic - next topic

Kariky

Hi,

Can i really connect this one direct to Arduino output without additional circuitry needed for using 70 Watt 230VAC waterpump ?


http://www.buyincoins.com/new_en/details/ssr-25-da-solid-state-relay-for-pid-temperature-controller-25a-output-24v-380v-product-9224.html

Seems to be very affordable   $)
My software has no bugs, only random features.

DVDdoug

It should work fine without any additonal circuitry.   

Motors are inductive, so I'd kind-of like to see if it's rated for inductive loads...   But, at 75W you'll be using less than one amp so you have quite a bit of safety margin.

The price is lower than usual, so it's probably surplus or removed from equipment (used).

Kariky


Thank you, i'll give them a try.

btw "brand new and high quality"  8)
My software has no bugs, only random features.

dc42

#3
Feb 09, 2013, 10:40 am Last Edit: Feb 09, 2013, 10:42 am by dc42 Reason: 1
That SSR is of the zero crossing type, so it may not work properly with an inductive load such as your pump. You should preferably use a random-fire SSR or a power opto triac. See http://www.crydom.com/en/Tech/Newsletters/Solid%20Statements%20-%20SSRs%20switching%20types.pdf.

PS - I suggest you look for an SSR with a lower current rating too, say 1A rather than 25A. The leakage current of a 25A SSR may be rather high, also there is a risk that the small current drawn by your pump may not be enough to keep a 25A SSR turned on.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

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