Chapter 10
194
UM10350_PCNC770_Manual_0916A
Troubleshooting
Axes Drive Subsystem Checklist
Table 4.2 (...continued)
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
A defective
electronic driver
module
Medium
Swap the ribbon cable connector for
the control signals, and the motor/DC
supply connector between a known
functioning drive (X-axis in Figure
10.12) and the malfunctioning drive
(Y-axis in Figure 10.12).
NOTE: Do not swap any wires on a live
system. Power off according to the Power
On/Off Procedure.
Since there are at least three
identical electronic driver
modules in the axis drive
subsystem, swapping control
signals between modules is very
helpful during troubleshooting.
One must recognize that if
control signals are switched
from the electronic driver
modules on the non-functioning
axis to a module on a functioning
axis, the end of travel limit
switch on the non-functioning
axis will not work. Take care to
avoid reaching the end of travel
when moving an axis.
Jog the Y-axis in both directions.
If the X-axis moves properly,
the control signals are good;
it is likely the Y-axis driver is
defective.
Jog the X-axis in both directions.
A defective Y-axis driver is
conrmed if the Y-axis does
not move or moves in only one
direction.
If commanding the X-axis
moves the Y-axis, it’s likely there
was a poor connection in the
ribbon cable connector to the
axis driver module. Swap the
ribbon cables back and repeat
the test. Inspect and wriggle
the ribbon cable connectors. It
is also possible that there is a
damaged ribbon cable J4, DB-25
cable, or mill interface board in
the controller.
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