203 v drives

[eloid]

I noticed on some schematics some poeple dont use the common on the
203v drive and wire it up to the com on the break brd.....outputs

Im not refering to the ground to the drives....not sure it the 203v has changed ov the years,,,, but my drives dont have +5v just a common marked next to step and direction? they dont have +5v marking.... ? So in my case do I need to connect the common beside step dir to the commom on my cnc4pc c23 break out broard?

[Crevice Reamer]

When you select the 203V program for your C23, it will automatically set itself to have ground for the common. Lesser BOBs require setting a jumper.

http://www.cnc4pc.com/Store/osc/prod...roducts_id=182

CR.

[eloid]

The common terminal to pins 2-9 can be ground or +5vdc. The common terminal to pins 2-9 can be ground or +5vdc. When you select program for the driver to used, COM will automatically become what the driver will need. If you select the program for the G320, COM = +5vdc, if you select the program for the G203V, COM = GND

so in my case the com will be defined gnd on g203v...thus I am assumming I still I need to wire it (common on the 203v drive) to the com terminal....on the c23.Am still ...im a newbie and learning.... pls expalin if im wrong?

[Crevice Reamer]

Originally Posted by eloid The common terminal to pins 2-9 can be ground or +5vdc. The common terminal to pins 2-9 can be ground or +5vdc. When you select program for the driver to used, COM will automatically become what the driver will need. If you select the program for the G320, COM = +5vdc, if you select the program for the G203V, COM = GND so in my case the com will be defined gnd on g203v...thus I am assumming I still I need to wire it (common on the 203v drive) to the com terminal....on the c23.Am still ...im a newbie and learning.... pls expalin if im wrong?

That is correct. Com on the C-23 will be defined as ground and you will wire com to com.

CR.

[eloid]

Then , i just have to wire a external + 5v and to the c23...
and +12 v and gnd as required for the c23......
would +15v be to much for the 12v input else I will add
voltage drop to reduce it to 12v

[Crevice Reamer]

Ok, the manual is very confusing. It also looks like you need to find the jumper JP1, (in the center of the C-23 and jumper between pins 2 and 3 to set Com to ground.

CR.

[Crevice Reamer]

The analog Speed Control requires 12V 10mA. I don't think 15V will work. This 12V PSU should power nothing else. The grounds of the speed control circuit MUST be kept separate from the other grounds on the board.

CR.

[eloid]

The analog Speed Control requires 12V 10mA. I don't think 15V will work. This 12V PSU should power nothing else. The grounds of the speed control circuit MUST be kept separate from the other grounds on the board.


so is this for VFD drives? or speed controlers routers like c19 frequency convertor? from cnc4pc ....I m planing in the next 4-6 months to buy a vfd but need to save for it... as for keep the gounds separate i can understand that .... but Im guessing it should be floating gnd.... from a smaller transformer not 100% sure how to create a separte gnd.... orfloat gnd...any other way,,,,

also like to ask you ,,,, how have you wired your estop relays just using the
c23 or do you kill the power to the drives etc... I like to wire up pause or resume switch to continue where i left off... still a green newbiee...

thanks so much for you help....Crevice Reamer

[eloid]

how do you keep ground sepatate off a transformer?

please explain

[Richards]

Is there a reason that you need to keep one power supply ground isolated from other power supply grounds? Since Ground is the reference point from which all voltages are measured, you would normally connect all grounds together.

[Al_The_Man]

You have opened a can of worms there.
When is a ground not a ground? If a ground is isolated from earth ground, is it a ground?
Should all terminals marked ground be common?
If they are isolated from each other how do you identify them if they are all marked Ground?
If a BOB manual states that this ground can be grounded but this ground should not be grounded or made common to this ground??
Unfortunately the result is gibberish.
From my perspective, if someone wishes to use the term Ground for the Common reference, then to avoid any misunderstanding the reference should be qualified, which unfortunately it very rarely is.
IOW, use Chassis Ground, Earth Ground, 5v Ground, 12v Ground, Input ground etc.
Now going back to your question of whether the 'Grounds' or commons of different systems should be connected, this is open to either personal preference or manufacturers recommendations.
I personally prescribe to making all systems commons connected to Earth ground regardless, wherever possible, as opposed to the isolated approach.
See this previous posting. http://www.cnczone.com/forums/showthread.php?t=71923
Hope this helps somewhat
Al.

[eloid]

i read the doc for bob and for The analog Speed Control requires 12V 10mA.


The grounds of the speed control circuit MUST be kept separate from the other grounds on the board. ok So... question is how do do this?

do i take one of my used 12v taps off the xformer and rectify it... and make a new ground bar? and keep it isolated off the neg lead, of the xfromer?