Mitsubishi Electric MELDAS MDS-B Series Instruction Manual page 175

Scale CPU error:
Alarm No.
The CPU of the absolute position linear scale connected to the MAIN side is not
48
operating correctly.
Investigation details
1 Wiggle the connectors by hand to check
whether the absolute position linear
scale connectors (unit side and scale
side) are disconnected.
2 Turn the power OFF, and check the
detector cable connection with a tester.
3 Connect to another normal axis unit,
and check whether the fault is on the
unit side or scale side.
4 Check if there is any abnormality in the
unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
Scale overspeed:
Alarm No.
The absolute position liner scale connected to the MAIN side detected a speed of
49
45m/sec or more when the CNC power was turned ON.
Investigation details
1 Check that the system is an absolute
position linear scale specification
system.
2 Check whether the machine was
operating when the alarm occurred.
3 Wiggle the connectors by hand to check
whether the absolute position linear
scale connectors (unit side and scale
side) are disconnected.
4 Turn the power OFF, and check the
detector cable connection with a tester.
5 Connect to another normal axis unit,
and check whether the fault is on the
unit side or detector side.
6 Check if there is any abnormality in the
unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
Chapter 11 Troubleshooting
Investigation results
The connector is disconnected (or
loose).
The connector is not disconnected.
There is a connection fault.
The connection is normal.
The alarm is on the unit side.
The alarm is on the absolute position
linear scale side.
No abnormality is found in particular.
An abnormality was found in the
ambient environment.
Investigation results
The system is not the absolute position
linear scale specifications.
The system is the absolute position
linear scale specifications.
The machine was operating.
The machine was not operating.
The connector is disconnected (or
loose).
The connector is not disconnected.
There is a connection fault.
The connection is normal.
The alarm is on the unit side.
The alarm is on the absolute position
linear scale side.
No abnormality is found in particular.
An abnormality was found in the
ambient environment.
11–19
Alarm check timing
f1 f2
–
Remedies
Correctly install.
Investigate item 2.
Replace the detector cable.
Investigate item 3.
Replace the drive unit.
Investigate item 4.
Replace the absolute position linear scale.
Take remedies according to the causes of
the abnormality.
Ex. High
temperature ... Check the
cooling
fan.
Incomplete grounding .... Additionally
Alarm check timing
f1 f2
–
Remedies
Correctly set the SV025: MTYP
parameter.
Investigate item 2.
Check the motor's mechanical brakes and
machine system.
Investigate item 3.
Correctly install.
Investigate item 4.
Replace the detector cable.
Investigate item 5.
Replace the drive unit.
Investigate item 6.
Replace the absolute position linear scale.
Take remedies according to the causes of
the abnormality.
Ex. High
temperature ... Check the
cooling
fan.
Incomplete grounding .... Additionally
f3 f4
ground.
f3 f4
– –
ground.