CNC4PC C11G - Analog Output Not Reaching 10 VDC

C11G (Rev. 8.2) User Manual
Revision: 01/27/2010 http://cnc4pc.com/TechDocs/C11GR8_2_User_Manual.pdf 20/21
POSSIBLE CAUSE
POSSIBLE SOLUTIONS
- A chip may have gone bad. These
buffers could act as fuses for the
signals, and they can go bad because
of noise spikes or even strong static.
- These chips are inexpensive and readily
available. You can order them here:
http://www.cnc4pc.com/Store/osc/index.ph
p?cPath=38_43.
- Carefully moving chips around and
checking if the problem moves around
could be a way of figuring out if this is
the case.
- There could be a problem with the
parallel cable or parallel port.
- Test this with a different PC or parallel
port.
SYMPTOM 5: THE ANALOG OUTPUT DOES NOT REACH THE 10VDC.
POSSIBLE CAUSE
POSSIBLE SOLUTIONS
- Insufficient pulse width. It is possible
that the signal pulse width is not
enough to activate the optocouplers.
- In Mach X, go to Config / Motor Tuning /
Spindle. Under Step Pulse length
increase this value, use a number from 3
to 5, but start with 3.
- The signal is set active low or the
breakout board could be inverting
the signals.
- In Mach X, go to Config / Ports&Pins /
Motor Outputs. Change the active low
status of the pin used for step.