Troubleshooting At Power On - Mitsubishi MELDAS MDS-C1 Instruction Manual

6-2

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
Symptom
display
AA Initial communication with
the CNC was not
completed correctly.
Ab Initial communication with
the CNC was not carried
out.
12 An error was detected in
the unit's memory and IC
during the self-diagnosis
at power ON.
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.
Normal drive unit LED display at NC power ON (for 1st axis)
6. Troubleshooting
Cause of occurrence
The drive unit axis No.
setting is incorrect.
The CNC setting is incorrect. Is the No. of CNC controlled axes
Communication with CNC is
incorrect.
The axis is not used, the
setting is for use inhibiting.
Communication with CNC is
incorrect.
The CPU peripheral circuit is
abnormal.
E7 F1
Emergency stop F+axis No.
6 - 4
Investigation method
Is there any other drive unit that has the
same axis No. set?
correct?
Is the connector (CN1A, CN1B)
disconnected?
Is the cable broken?
Check the conductivity with a tester.
Is the axis setting rotary switch set to "7"
to "F"?
Is the connector (CN1A, CN1B)
disconnected?
Is the cable broken?
Check the conductivity with a tester
Check the repeatability.
Check whether there is any abnormality
with the unit's surrounding environment,
etc.
E7
Emergency stop
Remedy
Set correctly.
Set correctly.
Connect correctly.
Replace the cable.
Set correctly.
Connect correctly.
Replace the cable.
Replace the unit.
Improve the
surrounding
environment.
Not lit