Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 156

(12) Alarm No.
[Details] A CRC error occurred in the communication data from the NC.
Investigation items
1 Jiggle the connectors
between the NC ↔
spindle drive unit,
battery unit ↔ spindle
drive unit, and spindle
drive unit ↔ servo
drive unit to see
whether any are
coming loose.
Also check if the
terminators are
coming loose. Check if
there is any excessive
force being applied to
the connectors.
2 Disconnect each cable
in item 1, and check
the connection with a
tester.
3 Investigate the wiring
and installation
environment.
1) Are the units
correctly grounded?
2) Are there any
devices that
produce noise
around the units?
(13) Alarm No.
[Details] The movement command data from the NC was excessive
Investigation items
1 Investigate as in alarm
No. 34 , and carry
out the appropriate
measures.
(14) Alarm No.
[Details] The cyclic data transmission from the NC was interrupted.
Investigation items
1 Investigate as in alarm
No. 34 , and carry
out the appropriate
measures.
11. Troubleshooting
34 : NC COMMUNICATION AND CRC ERROR
Investigation results
Connector came (was coming) loose.
Excessive force was applied.
No particular problem.
There was a connection fault.
There was no connection fault.
1) The grounding is incomplete.
2) The alarm occurs easily when a
specific device is operated.
3) No particular problem.
35 : NC COMMUNICATION AND DATA ERROR
Investigation results
36 : NC COMMUNICATION AND TRANSMISSION ERROR
Investigation results
Install correctly.
Investigate item 2, and carry out the
appropriate measures.
Replace the cable.
Investigate item 3, and carry out the
appropriate measures.
Correctly ground the units.
Execute noise countermeasures for
the device at the left.
Replace the spindle drive unit. Or,
replace the MCP card on the NC
side.
11 − 12
Remedy
Remedy
Remedy