When you click on E-Stop on the Mach3 screen, the PMDX-126 will only know
about it if you have the charge pump function enabled. If you DO have the
charge pump function enabled and Mach3 is configured to NOT provide the
signal for the charge pump when it is in reset, then the PMDX-126 will turn
off all of its outputs including the relays and PMDX-107 spindle controller
if present. This is the normal configuration that we recommend.
When E-Stop is presented directly to the terminals on the PMDX-126, it
will always turn off all of its outputs in response to the E-Stop regardless
of what Mach3 is doing.
We recommend that you fuse the AC mains side of the power supply for
the stepper motors. This avoids issues with back EMF from the motors
not having anywhere to go. If you do choose to fuse the DC input to the
PMDX-134, you will need to choose a fuse that can handle the correct
current for your motors. This is typically 2/3 of the sum of all the motor
currents. If all 4 of the Gecko drivers are running at a full 7 amperes,
then a 20 ampere fuse would be recommended. The internal fuse in each
G203V is 5 amperes.