Need Help!- g540 setup question

[don_don]

I have just purchased the G540 4 axis package from Keling and not sure what size resisters I should be using. I have read the user manual and through the forums here and still not confident I understand.

G540 4 axis package (One G540 + Four
KL23H284-35-4B (1/4” Dual shaft with a flat) 387 oz-in + one KL-600-
48 48V/12.5A 115V /230Vpower supply)

http://www.kelinginc.net/KL23H284-35-4B.pdf (motor spec sheet)

also what is a good online electronics store to purchase these from and also limit switches / home switches / e-stop

[Richards]

The KL23H284-35-4B stepper motor is rated at 3.5A, so, with the G540, you would use a 3.5K resistor (1/8W to 1/2W). Radio Shack has 3.3K 1/4W resistors, which would work to get you started.

www.automationdirect.com sells switches, proximity sensors, contactors, relays, etc. www.jameco.com and www.digikey.com sell electronic parts, such as resistors, chips, etc.

[Crevice Reamer]

Digikey has a 3.48K 1/4 Watt resistor that is perfect. Ten cents.


http://dkc1.digikey.com/us/en/pdf/Current.html

http://search.digikey.com/scripts/Dk...sistor&stock=1

CR.

[don_don]

Thanks for the help. I ordered the resisters/limit switches/home switches on wednesday.
recieved my G540 4 axis kit from Keling yesturday and . Today was the first day I brought my machine home after 3 yrs working on it (very exciting). This is my first cnc so still trying to figure out what to do tomorrow.

[Crevice Reamer]

That's a nice looking machine don! Good work! I bet you can't wait to make some sawdust.

CR.

[fretsman]

Don, just wanted to comment on your tank of a machine there. Looks built VERY well and would love to see more pics of it if you have them-

What are your travels?

Thanks,
Dave

[don_don]

table is about 32 by 15. I will post more pics here as I complete project. Received my resisters from digikey today but was unable to find 22/4 shielded wire or I would have started to connect controller/motors.

[Crevice Reamer]

Originally Posted by don_don table is about 32 by 15. I will post more pics here as I complete project. Received my resisters from digikey today but was unable to find 22/4 shielded wire or I would have started to connect controller/motors.

You will also need some other stuff:

You can use THIS wire for motor cables and home/limit switches. Ground the drain wire ONLY at the driver end.

http://cgi.ebay.com/Servo-Motor-Wire...3286.m20.l1116

You won't need any db9 motor connectors with the G540, as they come WITH it. The G540 also has circuitry for simple spindle speed control and outputs for dc relays to turn coolant pump on or off.

These inexpensive relays are very good :

http://www.surpluscenter.com/item.as...tname=electric

You will also need an estop switch. This one from Keling only costs 10 bucks and works fine:

http://kelinginc.net/CNCPackage.html

On that same page Is a DB25 serial connector which you may need.

The G540 is so small that many are mounting theirs INSIDE the computer case.

Camtronics has a case MADE for the G540:

http://s120220635.onlinehome.us/stepper-components.asp

CR.

[LaserImage]

Originally Posted by don_don I have just purchased the G540 4 axis package from Keling and not sure what size resisters I should be using.

It would seem to me that Keling would be providing great customer service if they provided the resistors with their "package". They don't cost much and if they provided them to their customers, it would save a lot of time and trouble trying to figure out what is needed and where to get it...

Gary

[autocadplease]

I just bought the same package too. Do you really need shielded wire?

"Radio Shack has 3.3K 1/4W resistors, which would work to get you started."
When so say get you started, can they be used permanently? Or does the 0.2K make a difference?

[Crevice Reamer]

Shielded wire is BEST, but optional on motor cables. Shielded wire is NECESSARY for home/limit switches.

There is a slight loss of performance when you limit the Amperage. I prefer to wait and get the proper resistor size, just because I KNOW that once I solder those in and mount the connectors--I'm NOT going to unsolder and replace them.

So, at least for ME, it's permanent.

CR.

[LaserImage]

Originally Posted by autocadplease I just bought the same package too. Do you really need shielded wire?

I didn't use it and I have not having any problems at all. Not to say you won't, or it that it is a good idea, just that mine seems fine.

Originally Posted by autocadplease "Radio Shack has 3.3K 1/4W resistors, which would work to get you started." When so say get you started, can they be used permanently? Or does the 0.2K make a difference?

3.3K vs 3.5K will reduce the amount of current you have going to the motors - by about 6%. Figure out what a 6% reduction in speed will be and decide if you need that extra bit - probably not. So, yes it will make a difference but how important is it?

Gary