Morning all

I am looking to automate control of a 3 phase motor (230v 3kW) using an Arduino.
I assume I'll need some sort of contactor which I could control through a relay board connected to the Arduino. I'm having trouble locating an exact product to purchase and am looking for recommendations or even just the correct search terms.
Thank you in advance

 

Contactors usually have a HP rating on them, if you need reverse capability then you require the dual interlocked version.
You can also get them in various coil voltages for AC or DC .
The Group Schneider/Telemecanique line are nice and compact.

 

Morning all

I am looking to automate control of a 3 phase motor (230v 3kW) using an Arduino.
I assume I'll need some sort of contactor which I could control through a relay board connected to the Arduino. I'm having trouble locating an exact product to purchase and am looking for recommendations or even just the correct search terms.
Thank you in advance

You can get some idea from this video:

 

You can get some idea from this video:

That is if you want VF control. i.e. add a VFD.
It sounded as though the OP just needed ON/OFF control?

 

Correct, no speed control required, I only need on / off
Ideally something less costly than simply mounting a stepper motor on to the rotary isolator switch and mechanically actuating it

 

So what is the problem using a Contactor CW LV DC coil?

 

So what is the problem using a Contactor CW LV DC coil?

Would this be appropriate?

https://www.amazon.es/Heschen-Conta...11&sprefix=contactor+trifasico,aps,185&sr=8-6

I hope the page can auto translate to your language

My motor is rated at 2.6A 230v. The circuit breaker currently installed is 10A

I assume I could connect this contactor after the MCB and simply energise it's coil using an arduino relay circuit?

 

A motor CB is normally rated at 1.3x the motor rated load. your motor is only 2.6a.
That contactor uses a 230vac coil, how are you going to control that with Arduino?

 

A motor CB is normally rated at 1.3x the motor rated load. your motor is only 2.6a.
That contactor uses a 230vac coil, how are you going to control that with Arduino?

An electrician installed the original 10A MCB so perhaps I should enquire as to whether it is rated too high?

My plan would be to use a relay board such as this to power the coil

https://europe1.discourse-cdn.com/a...396edf9efda0b0051a98ec6ce5b640a300490a92.jpeg

Thoughts?

 

Also with a motor controlled contactor, it is usually followed by O/L (over load) unit, in most cases they connect into the bottom terminals of the contactor.
Usually they posses N.O. & N.C contacts in order to drop the coil out on O/L and also the N.O. can be used to input the control to advise it that an overload has occurred.