Chapter 10
199
UM10350_PCNC770_Manual_0916A
Troubleshooting
Axes Drive Subsystem Checklist
Table 4.6
Cannot reference all axes or end of travel limits do not work (limit switch problems)
Possible Cause Probability
Action to Identify Cause of Problem
Discussion
Limit switch stuck
in the on state
or
Limit switch
wire broken or
wire connection
defective
High
Consult the PathPilot Status screen to
see if a limit switch has actuated, even
though no axis is at the end of its travel.
See Table 4.7
Limit switch
contacts stuck in
the off state
Medium
Consult the PathPilot Status screen to
see if a limit switch is being reported as
not actuated even though the axis is at
the end of its travel.
See Table 4.7
Limit switch not
being contacted at
end of travel
Medium
Check to see if the limit switch is
loose or if the actuating cam is actually
contacting the switch.
If it looks like the switch is
being actuated properly but
the Status screen does not
report the switch as being
made, go to next step.
Control board
defective
Low See Table 4.7
A defective control board will
report no change in the state
of the limit switch even though
the switch and wiring are
functioning properly.
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