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6. Troubleshooting
6 - 10
6-3 Troubleshooting
Follow this section to troubleshoot the alarms that occur during start up or while the machine is
operating. If the state is not improved with the following investigations, the drive unit may be faulty.
Exchange the unit with another unit of the same capacity, and check whether the state is improved.
6-3-1 Troubleshooting at power ON
If the NC system does not start up correctly and a system error occurs when the NC power is turned
ON, the drive unit may not have been started up properly. Check the LED display on the drive 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
the unit's memory and IC
during the self-diagnosis
at power ON.
The CPU peripheral circuit is
abnormal.
Check whether there is any abnormality
with the unit's surrounding environment,
etc.
Improve the
surrounding
environment.
The drive unit has started up normally if the following type of emergency stop (E7) is displayed on the
display unit's LED display.
F1
F+axis No.
E7
Emergency stop
Not lit F1
F+axis No.
E7
Emergency stop
Normal drive unit LED display at NC power ON (for 1st axis)