Hey guys I"ve been working on a DIY CNC machine for the past couple weeks now and I am working on the final details of my power circuit. So I have drawn up a schematic below and if anyone has any critiques about it that would be welcome. I am extremely new to electronics and only kinda know what I am doing but mostly I'm wingin it.
So I have a Hitachi M12VC hardware store router which I am switching on and off with a Zettler AZ2280-1C-240AF relay I got off Alliedelec here is the data sheet: http://www.alliedelec.com/Images/Products/Datasheets/BM/AMERICAN_ZETTLER_INC/686-0188.PDF
I haven't been able to switch it yet, I'm not sure if I need a higher voltage than +12v, 750ma to switch the relay...? I can't find the specs in the data sheet.
I also am not sure about my transistor circuit (which transistor should I use, and what size resistor/s?)
Is my fuse in the right location and what specs should it have?
As for the wiring is there a specific wire size and type that I should use?
Do I tie all the grounds together or only grounds of the same voltage?
Looking at the datasheet it appears your relay (AZ2280-1C-240AF) has a 240V AC coil so you will not be able to switch it with an arduino. I would suggest a solid state relay such as this: 25A, 480VAC Solid State Relay, UL.
By the way, I use that same router on my machine and I've been very pleased with it. If you want to make it even better (especially if you're doing a lot of fine work with small bits, consider getting a Precise Bits collet set (http://www.precisebits.com/products/equipment/bosch_1618_collets_nuts.asp) which will reduce the runout giving you better finish cuts and fewer broken bits.
yes, it appears to have a 24V coil so you could run it from your 24V motor supply. I would still suggest that the solid state relay is a better choice for a high amperage inductive load. If you read the datasheet you can see that the ratings are for resistive loads. It would work but arcing across the contacts could eventually cause relay failure especially give the small contacts of a miniature relay. In fact, a second look at the datasheet shows that at 125V it is rated for a 1hp motor so it would be too small for the Hitachi. The other advantage of the SS relay is it will operate on logic level signals so you wouldn't need the transistor to drive it.