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artmin
29-01-2012, 10:56 AM
I have a small niggle with my newly built machine. The PC is built into the machine housing itself so it's a complete unit. When I press the PC on button the BOB is closing the spindle relay, making the spindle spin until I enter EMC2.

Is there anyway that a PCI card can be configured so at not to send out a signal during the boot sequence? I thought about inverting the relay contacts & BOB output, but that would make the spindle start as soon as I plug the machine into the wall. I know I could rewire the spindle to take power from the seperately switched motor drives but i was wanting to keep each system individually fused.

Many thanks,

Gavin

JAZZCNC
29-01-2012, 11:18 PM
Most decent BOB's have a charge pump circuit built into them to stop such as this happening by not letting any signals thru untill the control software sends 14khz signal taking control. Some BOB's will let you turn this feature off so could this be turned off.?
What Bob is it.?

John S
29-01-2012, 11:34 PM
I know Mach uses a charge pump, does EMC ?

JAZZCNC
29-01-2012, 11:53 PM
I know Mach uses a charge pump, does EMC ?

Yes I believe it does John but could be wrong I'm Mach thru n thru but I'm pritty sure I've seen references to charge pump and EMC on CnCZone.

2eOpoz now it's your turn to shine as Guru . . .Cmon Guru show your self. . .:lol:

artmin
30-01-2012, 10:47 AM
I always wondered what a charge pump was.

This is the BOB, though I don't see a reference to charge pump : http://www.slidesandballscrews.com/pdf/ZP5A-INT axis interface board manual.pdf (http://www.slidesandballscrews.com/pdf/ZP5A-INT%20axis%20interface%20board%20manual.pdf)

I can give Gary a shout & see what he thinks.

I just checked the online docs for EMC2 & it is configurable for a charge pump :smile:. Bet you it turns out the BOB isn't! :cry:

artmin
30-01-2012, 11:28 AM
Just found out, no charge pump.

Plan B then :naughty::naughty:.....

John S
30-01-2012, 12:05 PM
Various people sell just a small charge pump board as an add on.

http://www.cnc4pc.com/Store/osc/product_info.php?cPath=23&products_id=51

artmin
30-01-2012, 12:53 PM
Cheers john,

That looks like the best option!

Gavin

John S
30-01-2012, 01:19 PM
Let me have a look round as i may still have some kicking about

artmin
30-01-2012, 01:49 PM
John,

Thanks for that. I'll hold off then.

JAZZCNC
30-01-2012, 02:09 PM
Various people sell just a small charge pump board as an add on.

http://www.cnc4pc.com/Store/osc/product_info.php?cPath=23&products_id=51

Artmin also spotted it shows how to set the charge pump inside EMC.

artmin
30-01-2012, 03:38 PM
Artmin also spotted it shows how to set the charge pump inside EMC.

http://www.linuxcnc.org/docs/EMC2_Getting_Started.pdf Bottom of page 19