Chapter 10
196
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
Electrical short
on a drive
Low
Look at the LEDs on the axis drivers. If
there is a red LED lit on the drive, then
it has tripped.
Cycle power to the mill, and the
trip should reset. If it persists,
then inspect the wiring for
shorts, test motor resistance
(see Table 4.3). If problem
persists, replace drive.
Axis Drive Subsystem Checklist
Table 4.3
Axis Motor Winding Resistance
X-axis Y-axis Z-axis A-axis
Resistance
Ω Above
Ta r e
From
(black
probe)
To
(red
probe)
From
(black
probe)
To
(red
probe)
From
(black
probe)
To
(red
probe)
From
(black
probe)
To
(red
probe)
308
309
310
312
313
314
316
317
318
320
321
322
0.5-2.0 Ω
0.5-2.0 Ω
>1 M Ω
310 309 314 313 318 317 322
323
321
0.5-2,0 Ω
1 M Ω
NOTE: Resistance across leads on all phases for X, Y, and Z should be
about the same. Deviation may indicate a problem (does not apply to
A-axis).
— — —
All wires
above
Ground
bar
All wires
above
Ground
bar
All wires
above
Ground
bar
All wires
above
Ground
bar
>1 M Ω
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