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6 Troubleshooting
MITSUBISHI CNC
(Note) For MDS-D-SVJ3/SPJ3 Series, "888" is displayed.
Alarm No.
81
Sub side detector cable error
The cable type of machine side detector does not match the detector specifications set by the parameter.
Investigation details Investigation results Remedies SV SP
1
Check if the below parameters match
the connected detector and cable.
Servo: SV025
Spindle: SP031
The detector does not match the spec-
ifications.
Replace the detector.
The parameter is not correct.
Set the parameters so that they meet
the machine side detector.
<Servo:SV025>
- Rotary
Pulse 2xxx
Serial 6xxx
- Scale
Pulse 8xxx
Serial Axxx
<Spindle:SP031>
Pulse 4200
Serial 6200
There is no problem with the selection
of the detector and cable.
Replace the detector or cable.
Alarm No.
87
Drive unit communication error
The communication frame between drive units was aborted.
Investigation details Investigation results Remedies SV SP
1
Check the connection of the optical
communication cable between drive
units.
The cable and connector were loose.
Connect again so as not to be loos-
ened.
The cable and connector were not
loose.
Replace the cable.
Check the investigation item No. 2.
2 Check the repeatability.
The error is always repeated (in high-
speed synchronous tapping).
Replace the servo drive or spindle
drive unit that is used for high-speed
synchronous tapping.
Alarm No.
88
Watchdog
The system does not operate correctly.
Investigation details Investigation results Remedies SV SP
1
Check whether the servo or spindle
software version was changed recent-
ly.
The version was changed.
Change software version back to the
original.
The version was not changed. Check the investigation item No. 2.
2 Check the repeatability.
The error is always repeated. Replace the drive unit.
The state returns to normal once, but
occurs sometimes thereafter.
Check the investigation item No. 3.
3
Check if there is any abnormality in the
unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
Take remedies according to the causes of the abnormality in the ambient en-
vironment.
Alarm No.
8A
Drive unit communication data error 1
The communication data 1 between drive units exceeded the tolerable value in the communication between
drive units.
Investigation details Investigation results Remedies SV SP
1
Check if the error has occurred during
high-speed synchronous tapping.
The error occurs during the synchro-
nous tapping.
[1]Check the tool.
[2]Adjust the tapping.
The error does not occur during the
synchronous tapping.
Check the investigation item No. 2.
2 Check the repeatability.
The error is always repeated. Replace the drive unit.
The state returns to normal once, but
occurs sometimes thereafter.
Check the investigation item No. 3.
3
Check if there is any abnormality in the
unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
Take remedies according to the causes of the abnormality in the ambient en-
vironment.