PRO4896 4’ x 8’ CNC (December 2018)
NEMA 34 CNC Control System
2.2 kW Spindle / VFD System
· Touch plate sensor would not activate.
o Disassembled plate to rewire. (As I have done several times before)
o Noticed MACH4 probe signal was “ACTIVE” without the connection being made.
o Noticed machine would not jog.
o Restarted computer and machine, same problem, machine will not jog.
o Disconnected the probe cable from control box, MACH4 still shows probe active.
· History reads:
o Limit switch Y – tripped!
o ESS: Limit Switch triggered on Motor Limit 3
§ Tested all limit switches, all switches lit with metal contact.
§ Disconnected and reconnected all sensors one at a time to make sure it was not a connection issue.
o Can’t jog toward Y – limit!
· Machine will not HOME.
· When “AXIS LIMIT OVERRIDE” is on machine will jog in all directions.
· Noticed the belt was worn on the left y axis motor. Replaced belt. (Do not think this has anything to do with the issue but needed to be replaced.)
· Released the y-axis motor springs to make sure I did not have them too tight to move, same issue.
· Swapped y-axis sensors with x-axis, same issue. (Limit switch Y – tripped!)
· Swapped y-axis sensor cables at control box with x-axis, same issue.
· Under the MACH4 diagnostics tab, Homing Sensor Y2 and Limit Switches Y2— are blue. All other switches turn blue when testing. Input Signals Probe is blue.
· Ran machine all day yesterday without any issues.
