0
\$\begingroup\$

I am new to Arduino and Digital electronics, I have purchased an Arduino UNO, and want to control my water pump from it.

The water pump works on 220V and 15A.

can you guide me on this spec? what relays do i need etc?

\$\endgroup\$
4
  • \$\begingroup\$ Whats power rating of motor? 3.3kW?? \$\endgroup\$ Dec 27, 2016 at 4:31
  • \$\begingroup\$ @seetharaman with a single phase induction motor 3.3KVA gets you about 2KW mechanical power \$\endgroup\$
    – Jasen
    Dec 27, 2016 at 6:54
  • \$\begingroup\$ @seetharaman it's a 1 HP pump 1KW 8 stage Oli filled Motor... that's what the box says \$\endgroup\$
    – N.K
    Dec 27, 2016 at 9:56
  • \$\begingroup\$ is it good for my project ? ebay.in/itm/… \$\endgroup\$
    – N.K
    Dec 27, 2016 at 10:18

1 Answer 1

2
\$\begingroup\$

You must be careful when choosing the relay. Firstly, it must be appropriate for the your circuit power supply. For Ex. if your power supply is 5V DC, then you have to choose one which its supply voltage is 5V DC. Secondly,its contact current must be appropriate for the your load current (water pump). My sugggest is that you should choose min. 20A and over one in your circuit.

And I have attached an circuit about your question, you can connect a pump instead of the ac bulb.

schematic

simulate this circuit – Schematic created using CircuitLab

\$\endgroup\$
4
  • \$\begingroup\$ Current level is regular for a relay, if it needed higher current, then contactor must be used. In my Opinion, a relay is reasonable for that circuit. \$\endgroup\$ Dec 27, 2016 at 8:49
  • \$\begingroup\$ Where can I get 20A and over relay with 5V DV as a supply voltage. do we have such thing available for Arduino, I apologise as i am new to electronics? \$\endgroup\$
    – N.K
    Dec 27, 2016 at 10:00
  • \$\begingroup\$ Not 5V, it only supplies relay, and the pump is suplied from AC voltage source, so the current (around 20A) is drawn by it. \$\endgroup\$ Dec 27, 2016 at 10:22
  • \$\begingroup\$ all of the ones I've seen pre-wired for arduino are only good for switching 10A or less, you'll probably need to get a larger relay separately and either try to substitute it onto the board or use a small relay or a transistor circuit to switch it power for it. \$\endgroup\$
    – Jasen
    Dec 29, 2016 at 5:33

Not the answer you're looking for? Browse other questions tagged or ask your own question.