Mitsubishi Electric MELDAS MDS-R Series, Specifications And Instruction Manual

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10. Troubleshooting
10 - 8
Alarm No.
17
A/D converter error:
An error was detected in the A/D converter for detecting current FB.
Cause of occurrence Investigation items Remedy
1 CPU peripheral circuit operation is
incorrect.
Check for abnormalities in the unit's
surrounding environment, etc.
(Example: Ambient temperature, noise,
grounding) Improve the surrounding environment.
2 Drive unit is faulty.
Check the repeatability. If the problem is repeated, replace the
drive unit.
Alarm No.
18
Motor side detector: Initial communication error:
Initial communication with the motor side detector failed.
Cause of occurrence Investigation items Remedy
Check whether the drive unit connector
(CN2) is disconnected. Correctly connect.
1 Detector input connector is disconnected.
Check whether detector connector is
disconnected. Correctly connect.
Exchange with cable for other axis and
check repeatability.
2 Detector cable is broken.
Check cable continuity.
Replace the detector cable.
Check the repeatability. If the problem is repeated, replace the
drive unit.
3 CPU peripheral circuit operation is
incorrect.
Check for abnormalities in the drive unit's
surrounding environment, etc.
(Example: Ambient temperature, noise,
grounding) Improve the surrounding environment.
Example: High temperature
... Check the cooling fan
Incomplete grounding
... Add grounding measures
4 Drive unit input circuit is faulty.
Replace the drive unit.
5 Detector is faulty.
Try connecting the drive unit and detector
with another axis, and check the
repeatability.
(Note) Do not release the emergency
stop in this case.
Replace the detector.
(When using the absolute position
system, the zero point must be
established again.)
Alarm No.
21
No signal 2:
In the full-closed loop system, an error was detected in ABZ phase.
Cause of occurrence Investigation items Remedy
Check whether the drive unit connector
(CN2) is disconnected. Correctly connect.
1 Detector input connector is disconnected.
Check whether detector connector is
disconnected. Correctly connect.
Exchange with cable for other axis and
check repeatability.
2 Detector cable is broken.
Check cable continuity.
Replace the detector cable.
3 Drive unit input circuit is faulty.
Replace the drive unit.
4 Detector is faulty.
Try connecting the drive unit and detector
with another axis, and check the
repeatability.
(Note) Do not release the emergency
stop in this case.
Replace the detector.
(When using the absolute position
system, the zero point must be
established again.)
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