Chapter 10
190
UM10350_PCNC770_Manual_0916A
Troubleshooting
10.5.4 Axes Drive Subsystem
10.5.4.1 Overview of Axis Drive Subsystem
The axis motors (otherwise known as stepper motors) are used to move the X-, Y-, Z-, and A-axis.
The motors are powered by electronic driver modules (also referred to as axis drivers) which receive
control signals from the control board. The electronic driver modules get power from the DC bus
board (see Figure 10.11). Moon is limited in the extremes of travel by end of travel limit switches.
Contents of Axis Drive Subsystem Problem Resolution Checklist
Table 4.1 Axes will not move when commanded
Table 4.2 One axis will not move or moves in only one direction; other axes operate properly
Table 4.3 Axis motor winding resistance
Table 4.4 DC bus power distribution
Table 4.5 Axis movement is extremely noisy
Table 4.6
Cannot reference all axes or end of travel limits do not work (limit switch problems)
Table 4.7 Testing limit switch problems
Table 4.8 Steps are lost on axis travel
Axes Drive Subsystem Checklist
Table 4.1
Axes will not move when commanded
Possible Cause Probability
Action to Identify Cause of Problem
Discussion
Operating system
not commanding
the move or
controller
problem
High
Jog the axis and observe the mill
coordinate display.
If position displayed does
not change while jogging,
there is an operating system
problem/controller problem.
Try restarting the controller.
Control signals
not reaching the
electronic driver
modules
Medium
Problem with DB-25 cable from
controller to mill.
Check connections on both
ends and ensure they are
rmly seated; check for bent
pins in the connectors.
Problem with cable J4 bottom of
machine cabinet to control board.
Problem with cable J6 from control
board to axis drives.
A malfunction of
the DC bus
Low
Refer to Details of the Axes Drive Subsystem
earlier in this chapter.
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