Integrating a BCL-AMP capacitive sensor to LinuxCNC

forum.linuxcnc.org/plasma-laser/55477-la...a-beta-tester#322786

Hi All

Thanks for the help with this. But I am truly stuck up in calculation of the below.: 22900 and 23900 & 930000.0
 If the head is away I am getting a safe value of about 24000 for capacitive-sense-velocity in the halshow
My hm2_7c81.0.encoder.00.velocity-rpm is about 1440000 in the halshow.

When i run my program, the IHS happens perfectly but when the the THC takes control the torch just gets the down signal and never goes up. Kindly help with any formulas with these three parameters. Thanks!

# Configure a limit component for the capacitive sensor output since it is scaled
loadrt limit1
addf limit1.0 servo-thread
net capacitive-sense-velocity limit1.0.in
setp limit1.0.min 22900
setp limit1.0.max 23900
# hook up the limited signal to the plasmac arc voltage
net plasmac:arc-voltage-in <= limit1.0.out

and 

# Make a fake Ohmic probe based on the capacitive sensor
# Use the .velocity-rpm so the .velocity can be left unused for arc_ok
loadrt comp count=1
addf comp.0 servo-thread
net fake-ohmic-probe-in hm2_7c81.0.encoder.00.velocity-rpm comp.0.in0
setp comp.0.in1 930000.0
net plasmac:ohmic-probe comp.0.out
# ohmic output is comp.0.out



 

Nathan40 wrote:

When i run my program, the IHS happens perfectly but when the the THC takes control the torch just gets the down signal and never goes up. Kindly help with any formulas with these three parameters.

-Cutting voltage set to low
-Voltage readings to high
-Voltage scaling and offsets not set correctly
-No arc voltage reading at all, can be from inverted polarity into THC, wrong wiring from THC, THC input for high voltage while output from plasma is divided
-voltage divider in plasma/resistors set incorrectly
-broken wires from plasma to THC input
-etc

Please share min and max values calculation formulas for capacitive sense velocity for the optimum up and low signals for the fiber laser cutter. Eg to set up 100 volts 100/(fmax-fmin) for arc volt scale. Please correct if i am interpreting it wrong.

Those values need a massive offset (-22900), has that been applied?

Does this value always needs to be equal to the min value? Please help, thanks.