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