Mitsubishi MELDAS MDS-C1 Instruction Manual page 264

Communication or CRC error between NC and drive unit
Alarm No.
An error was detected in the data received from the NC.
34
Investigation details
1 Try replacing the terminator or battery
unit.
2 Check the NC bus communication
cable connection.
• Is the cable disconnected?
• Is the communication pair cable
connected in reverse?
3 Change the order of the connected
drive units.
(The rotary switch does not need to
be changed.)
4 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
NC command error
Alarm No.
The movement command data received from the NC was excessive.
35
Investigation details
1 Is the rapid traverse rate large for
using a sub-micron system or rotary
axis?
Communication or transmission error between NC and drive unit
Alarm No.
Communication from the NC was cut off.
36
Investigation details
1 Check whether the NC bus
communication cable connectors
(CN1A, CN1B) are disconnected.
2 Check the NC bus communication
cable connection.
• Is the cable disconnected?
• Is the communication pair cable
connected in reverse?
3 Change the order of the connected
drive units.
(The rotary switch does not need to
be changed.)
4 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
6. Troubleshooting
Investigation results
The state is improved.
The state is not improved.
The connection is incorrect.
There is no problem.
The alarm is on the cable
connections.
The alarm is on the unit connections. Investigate item 4.
No abnormality is found in particular.
An abnormality was found in the
ambient environment.
Investigation results
The rapid traverse rate is large.
The rate is not especially large.
Investigation results
The connector is disconnected (or
loose).
The state is not improved.
The connection is incorrect.
There is no problem.
The alarm is on the cable
connections.
The alarm is on the unit connections. Investigate item 4.
No abnormality is found in particular.
An abnormality was found in the
ambient environment.
6 - 19
Remedies
Replace the cause of the fault.
Investigate item 2.
Replace the cable.
Investigate item 3.
Replace the cable.
Replace the unit.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
Remedies
Check the rapid traverse rate limit.
Look for problems on the NC side,
such as not being able to follow up
the position FB.
Remedies
Connect correctly.
Investigate item 2.
Replace the cable.
Investigate item 3.
Replace the cable.
Replace the unit.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
SV SP
SV SP
SV SP