Mitsubishi Electric MELDAS MDS-R Series Specifications And Instruction Manual page 227

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