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15-12-2012 #11
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15-12-2012 #12
Birchy thats the safest way to do it especially if you are going to have a hand held control box at any time.
Damn Andy beat me. Need to type faster.
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15-12-2012 #13
FWIW, I work in engineering and have built many machine control panels over the years, so am familiar with standard conventions. However, CNC conversions are new territory and I'm a little concerned that I might blow a drive card or something if I break the wrong circuits on an E-Stop.
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15-12-2012 #14
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15-12-2012 #15
As I said previously, K1 is the contactor. Terminals (1) and (2) are N.O. contacts that will switch the L and N when the contactor is latched following a reset. The latching circuit will obviously drop out if an E-Stop is active. BTW, there aren't any N.C. contacts on the drawing I posted...
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15-12-2012 #16
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15-12-2012 #17
Birchy I take it that your control pcb does not have estop contacts?
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15-12-2012 #18
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15-12-2012 #19
It would stop the machine but you would lose position and not be able to restart the job from the same position easily. I dont have any experience with this pcb but I would think that one of the inputs would be able to be configured as a estop sense so that the software can recognise an estop signal.
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16-12-2012 #20
Must admit I hadn't really considered maintaining position in order to restart as I assumed that an E-Stop would be in emergencies only because something had gone drastically wrong. Would it not be more accurate to re-zero the tool because it would most likely overrun slightly when the E-Stop is activated? Plus a tool breakage would probably require manual movement of the Z-axis in order to replace it.
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