please help me wire up

[stk2008]

hi all ive posted in the DIY-CNC Router Table Machines heres my post

My home made cnc in progress

and machine pics etc allso shows u links to what motors,drivers,break out board i have.
heres my Q`s and in red is answers from motion control themself

is a 13amp fuse ok for the power supplies? (Yes)

what amp and type of fuse eg fast blowing fuse should be used from the power supplies v+ to the controllers v+ red wire? (10A standard fuse, don’t use fast blow)

what guage wire should i use for the power supplies v+ to the contollers v+ allso what gauge wire should be used for the other connections? (The cable we suggest is RS number 363-424)

the earth wire from the power supplies to the controllers not the gnd (black) wire the green wire do they screw into the controllers cases as there is no special connection for them...allso do i need to actualy earth that wire or is it done via power supplies as the power supplies are only showing a two core wire from the mains? Connect to the case of the drivers and then connect to the PC or controller say what????

does the break out board reqiure its own power as i had seen some on the net being sold with a 5v power supply or is that for the usb type only? (No)

now im realy lost what i need is a realy good drawing like the pdf freff sent in me other post (allso same as motion control sent) but it means nothing to me its showing two wires from mains to power supplies ive been told to use three core wire live,earth,neutral etc tho the rs code motion control recomended me is for a four core cable at £60 ouch why four core? im realy confused here.

so can someone edit the pdf to actualy mean somthing pleaseeeeeee make it for a real noob.

funny thing is i designed & built it but cant bloody do the wireing how mad is that

[stk2008]

pleaseeee any one?.

i need to get the bits etc so i can do it at the weekend.

[Al_The_Man]

You should have a common ground plate or ground terminals set up to connect the service ground coming from your 240v outlet, all drives and metalic parts of the system including the spindle motor frame should have a bonding ground conductor back to the common gnd plate, as well as shields etc.
If the drives are mounted inside a metalic enclosure, this should normally be OK as long as the ground plate is also mounted to it.
Also it is usually considered bad practice to fuse the DC drive power, unless a diode is connected in reverse bias across the fuse, this way if a fuse blows any motor BEMF has somewhere to go instead of stressing the drive.
Normally it is sufficient to fuse the AC side.
You should not require 4 conductor mains cable, just 3 cond.
Al.

[stk2008]

al the man u seem to know yo stuff would u please modify the pdf in me other post freff sent me to show every thing i need to add eg fuses,earthes etc as im a noob and have not got any idea plus ive just purchased £500 of motors,drivers etc and realy aint to hot on the idea of blowing it al up .

if you could do me a noob drawing i would realy appreciate it

[Al_The_Man]

The PDF gives you just about all the wiring details, how you implement it is another thing, this called control wiring layout etc.
I can add a couple of things to the PDF.
Because you can have several power and ground connections etc, it pays to set up a system of terminal blocks to take care of the multi-connections, this can take the form of ganged terminals. L,N Gnd (Earth) etc.
You will notice the green ground conductors, these should all come back to a common star point and be connected to the incoming service Earth wire.
The BOB also has a term labelled GND, now whether this goes to Earth ground or is just mislabelled and meant to be common is anyones guess, this may have to be clarified.
If this is the parallel port common, I would ground it.
If you go the route of fusing the drive DC, then obtain a minimum 10amp rectifier and connect in parallel with the fuse holder with the Cathode (stripe) to the DC supply side of the fuse.
The grounds shown going to each drive can terminate at the drive by a ring terminal under the fixing screw.
Strictly speaking, your stepper motors and any spindle motor should have a ground conductor terminated on the frame of each coming back to the common ground point.
Al.

[stk2008]

would u be able to do a drawing with all the extra bits and bobs please

[stk2008]

Hi again im still well and truly lost and im going to be wiring this up soon or hope to hehe.

please please could you draw/add items to the pdf i have please i have no idea what gauge wire to use or any thing.

[keebler303]

You haven't done much to help yourself, so you shouldn't expect everyone else to be ready to hold your hand. I am quite sure you are NOT stupid. You can find on google what size wire will carry how many amps. Step/dir wires can be quite small, power wires should be sized based on current draw. You know how many amps should be running to things so size the wire accordingly. If YOU posted a "noob" drawing with at least your components and their connections on it, maybe someone would be willing to help. It is no small chore to layout all the wiring and whatnot you need. Maybe you should try it first and then others can correct your work. You will also learn a lot more so you won't have to beg for help next time. You put in a little effort and I will too.

Matt

[stk2008]

i have ive spent hours looking for drawings etc.

ive allso been looking at the cable that i will wire up me motors to me drivers with will this work http://uk.rs-online.com/web/search/s...duct&R=4825516

i know one core can take 1amp so if 2 cores are twisted together that should allow 2amp and me motors are going to be 4 wires in total and they draw a max of 5.6amp but thats got to be devided by 4 is it? which is 1.4amp a cable? so should work correct? leaves 0.6 amp to spare.

allso do i need to earth the motors via this cabling if so will need to go for the cable with more cores or can i earth the motors via attaching a cable from the machine to the earth with all me drivers,power supplies etc.

thanks

[keebler303]

i have ive spent hours looking for drawings etc.

I said make one. You put your power supplies/motors/drives on a page and I'll help connect the dots.

ive allso been looking at the cable that i will wire up me motors to me drivers with will this work http://uk.rs-online.com/web/search/s...duct&R=4825516

I wouldn't use that one.

i know one core can take 1amp so if 2 cores are twisted together that should allow 2amp and me motors are going to be 4 wires in total and they draw a max of 5.6amp but thats got to be devided by 4 is it? which is 1.4amp a cable? so should work correct? leaves 0.6 amp to spare.

Your motor is rated 5.6 A per phase. That means that each phase (either A or B) will draw 5.6A max. There are 2 wires per phase. The current goes in one wire and out the other wire. So they all have to be rated for 5.6 A.

I would use this wire for your motors: http://uk.rs-online.com/web/search/s...duct&R=6282264

allso do i need to earth the motors via this cabling if so will need to go for the cable with more cores or can i earth the motors via attaching a cable from the machine to the earth with all me drivers,power supplies etc.
thanks

No. The screen on the wire should be earthed at the drive end but NOT at the motor end. The motor should be earthed through the machine. You do not want to have earth wires running everywhere or you can have ground loop problems. You always want to attach the screen/shield wire at only one end so no current can flow through it.

Matt

[Al_The_Man]

By rights it is risky to allow the grounding to occur incidentally by way of the machine body itself, the accepted method is to run a separate ground conductor to all motors, including the spindle motor, these should come back to the common ground plate set up in the enclosure that also has the service ground to it, this is call equi-potential bonding.
Servo motors typically have an extra pin or conductor especially for this ground conductor.
And it is code for mains powered motors in UK and here.
Due to the fact that 99% of the time, the MB 5v supply is referenced to ground through the MB screws, it is always therefore referenced to any mains powered motors through the grounded neutral, such as spindle/router motors, so normally you can never isolate the two due to this unless drastic steps are taken, even BOB's do not isolate this scenario.
So I always bypass this MB ground with a ground conductor from power supply common to the ground plate.
This avoids spurious ground paths weaving its way across the MB.
Al.

[stk2008]

i dident want to come across lazy i have looked into it and i realy am lost.
i get so little time having to work then having kids when i get back home its never ending hehe.

ouch that wire is more £££ than i thought plus going on from al the man should it not be 5 core as i need to run an earth from motor to case earth?.

im not trying to do a cheap crap job ive spent over £1000 allready and still have to convert me garage that will cost about £500 into a workshop plus more bits for the cnc.

ok i will draw up a little sketch of me bits with details of parts ref to R.S as i can get them bits deliverd to me work place.

thanks again