Mitsubishi Electric C70 Setup Manual page 584

Alarm No.
NC-DRV communication: CRC error
34
An error was detected in the data received from the CNC.
Investigation details
Gently shake the connectors of the optical
cables by hand that link between NC and
drive unit or between drive units to check for
1
loosening and disconnection.
Also check if an excessive force is not
applied on them.
Check for damages at the ends of the
2 optical communication cable.
Replace the cable.
Check whether the NC or drive unit software
3
version was changed recently.
Replace with another drive unit, and check
4 whether the fault is on the NC side or drive
unit side.
Check if there is any abnormality in the
unit's ambient environment.
5
(Ex. Ambient temperature, noise,
grounding)
Alarm No.
NC command error
35
The travel command data that was received from the CNC was excessive.
Investigation details
1 Check the alarm No. "34" items.
Alarm No.
NC-DRV communication: Communication error
36
The communication with the CNC was interrupted.
Investigation details
1 Check the alarm No. "34" items.
Alarm No.
Initial parameter error
37
An incorrect parameter was detected among the parameters received from the CNC at the power ON.
Investigation details
Check if the unit in which the alarm was
1
detected is servo axis or spindle.
Check the error parameters displayed on
2 the NC diagnosis screen.
Servo parameters: SV001 to SV065, SV082
Check the error parameters displayed on
3 the NC diagnosis screen.
Spindle parameters: SP001 to SP240
4 Check the alarm No. "34" items.
Alarm No.
NC-DRV communication: Protocol error 1
38
An error was detected in the communication frames received from the CNC.
Investigation details
1 Check the alarm No. "34" items.
Investigation results
The connector is loose or nearly
disconnected. The tab of the connector is
damaged.
The connector is not disconnected.
The damage is found at the end of the cable. Replace the communication cable.
The connection is normal.
The version was changed.
The version was not changed.
The alarm is on the drive unit side.
The alarm is on the unit connections.
Take remedies according to the causes of the abnormality in the ambient environment.
Investigation results
Investigation results
Investigation results
The alarm was detected in servo axis.
The alarm was detected in spindle.
Wrong parameters were set.
The electronic gears are overflowing.
The absolute position detection parameter
is valid when OSE104 and OSE105 are
connected. (Absolute position control
cannot be used.)
SV082/bitC to F are the same setting in one
unit.
SV082/bitC to F are not the same setting in
one unit.
Correct parameters were set.
The setting is wrong.
The set parameters are correct.
The set parameter value is different from
that of the machine specified detector.
Investigation results
Appendix 2.16 Troubleshooting
Remedies
Correctly install.
Replace the cable.
Check the investigation item No. 2.
Check the investigation item No. 3.
Change software version back to the
original.
Check the investigation item No. 4.
Replace the drive unit.
Check the investigation item No. 5.
Remedies
Remedies
Remedies
Check the investigation item No. 2.
Check the investigation item No. 3.
Correct the parameter setting.
Set the value within the designated setting
range.
Set SV001, SV002 and SV018 so that they
meet the machine specifications.
In order to use the absolute position control
function, an absolute position option is
required.
Correct the setting of SV082/bit0 to B.
Correct to the same setting.
Check the investigation item No. 4.
Correct the parameter setting.
Set the value within the designated setting
range.
Check the investigation item No. 4.
Change the setting to meet the machine
specifications.
Remedies
C70 Setup Manual
SV SP
SV SP
SV SP
SV SP
SV SP
567