First, a little frustration - I recognise the high stress everyone places on safety while handling Mains power, and it cannot be overstated. But, for the beginner, there’s simply no resource (or so it seems) to start (once the danger has been understood, and fear drilled into our heads) working with Mains power.
I’m planning to operate two Iwaki motor pumps (data sheet) off a 110 V AC supply (tried dumb-switching on/off with 220VAC, as listed in data sheet, but the pump I have with me clearly states 110VAC only). My country has 220V AC as its mains supply, which I’m stepping down using a 500 VA transformer.
To switch the supply, I plan to put a 12VDC/10A - 230VAC 10A relay. On the Common port, I plan to connect the Live wire. On the NO ports of the four channel relay, I plan to use two ports, to put in the continuation of the Live wire, up to the respective motors separately.
The neutral wire would be connected separately to the motor directly.
To switch the relays, I’m using an L298 motor control board. The arduino, inputs power to an optocoupler, which powers on an L298 board. The L298 board then energizes the relay. The relay establishes continuity between the two pieces of the Live wire, and the motor switches on.
I only need to switch the motor on or off. Don’t need to control speed.
Does this sound right? Or do you think I’ll blow up the building?
Thanks, attached is a schematic of the system from the relay to the motors.