Chapter 10
193
UM10350_PCNC770_Manual_0916A
Troubleshooting
Axes Drive Subsystem Checklist
Table 4.2
One axis will not move or moves in only one direction; other axes operate properly
Possible Cause Probability Action to Identify Cause of Problem Discussion
DB-25 cable not
fully plugged in
or pin bent on
connector
High Investigate connections.
If not tightened down, DB-25
cables will come loose, also
look for any bent pins at the
connection point.
Loose wires or
ribbon cables
High
Power off and check the ribbon cable
and the wires from the DC bus board.
Power on after completion and
check for operation.
A loose axis
motor coupling
Medium
Jog the axis and listen to determine if
you can hear the motor run.
Remove the cover plate over
the coupling and observe if the
motor is turning but the screw
is not.
(connued on next page...)
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