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10. Troubleshooting
10 - 3
10-2 Troubleshooting at start up
If the CNC system does not start up correctly and a system error occurs when the CNC power is turned
ON, the servo drive unit or spindle drive unit may not have been started up correctly.
Confirm the LED display on each unit, and take measures according to this section.
LED
display
Symptom Cause of occurrence Investigation method Remedy
The drive unit axis No. setting
is incorrect.
Is there any other drive unit that has the
same axis No. set?
Set correctly.
The CNC setting is incorrect. Is the No. of CNC controlled axes
correct?
Set correctly.
Is the connector (CN1A, CN1B)
disconnected?
Connect correctly.
AA Initial communication with
the CNC was not
completed correctly.
Communication with CNC is
incorrect.
Is the cable broken?
Check the conductivity with a tester.
Replace the cable.
The axis is not used, the
setting is for use inhibiting.
Is the axis setting rotary switch set to "7"
to "F"?
Set correctly.
Is the connector (CN1A, CN1B)
disconnected?
Connect correctly.
Ab Initial communication with
the CNC was not carried
out.
Communication with CNC is
incorrect.
Is the cable broken?
Check the conductivity with a tester.
Replace the cable.
Check the repeatability. Replace the unit. 12 An error was detected in a
memory IC or feedback
IC by self-check to be
made during the unit
power ON.
CPU peripheral circuit error
Check the grounding state and ambient
temperature.
Improve the ambient
environment.
If the LED on the top of the drive unit shows the emergency stop (E7) warning, the system has started
up correctly.
F1
F . F
.
E7 F1 E7
Not lit
+ axis No Emergency
stop
+ axis No Emergency
stop
Normal LED display at NC power ON (for 1st axis)