Filter
Top Products
7 - 20
7 Troubleshooting
MITSUBISHI CNC
Alarm No.
37
Initial parameter error
An incorrect parameter was detected among the parameters received from the CNC at the power ON.
Investigation details Investigation results Remedies SV SP
1
Check if the unit in which the alarm was detected is
servo axis or spindle.
The alarm was detected in servo axis. Check the investigation item No. 2.
◯◯
The alarm was detected in spindle. Check the investigation item No. 3.
2
Check the error parameters displayed on the NC
diagnosis screen.
Servo parameters: SV001 to SV065, SV082
Wrong parameters were set.
Correct the parameter setting.
Set the value within the designated setting
range.
◯
The electronic gears are overflowing.
Set SV001, SV002 and SV018 so that they
meet the machine specifications.
The absolute position detection parameter is
valid when OSE104 and OSE105 are
connected. (Absolute position control cannot
be used.)
In order to use the absolute position control
function, an absolute position option is
required.
SV082/bitC to F are the same setting in one
unit.
Correct the setting of SV082/bit0 to B.
SV082/bitC to F are not the same setting in
one unit.
Correct to the same setting.
Correct parameters were set. Check the investigation item No. 4.
3
Check the error parameters displayed on the NC
diagnosis screen.
Spindle parameters: SP001 to SP240
The setting is wrong.
Correct the parameter setting.
Set the value within the designated setting
range.
◯
The set parameters are correct. Check the investigation item No. 4.
The set parameter value is different from that
of the machine specified encoder.
Change the setting to meet the machine
specifications.
4 Check the alarm No. "34" items.
◯◯
Alarm No.
38
NC-DRV communication: Protocol error 1
An error was detected in the communication frames received from the CNC.
Investigation details Investigation results Remedies SV SP
1 Check the alarm No. "34" items.
◯◯
Alarm No.
39
NC-DRV communication: Protocol error 2
An error was detected in the axis information data received from the CNC.
Investigation details Investigation results Remedies SV SP
1 Check the alarm No. "34" items.
◯◯
Alarm No.
3A
Overcurrent
Excessive current was detected in the motor drive current.
Investigation details Investigation results Remedies SV SP
1
[1] Check whether vibration is occurring at the table
or spindle.
[2] Check if the vibration caused by the load
fluctuation is occurring.
Vibration is occurring.
[1] Set a filter.
[2] Lower the speed loop gain (SV005/
SP005).
◯◯
There is no vibration. Check the investigation item No. 2.
2
Check the repeatability of the alarm at the rapid
traverse feed for the servo and at acceleration/
deceleration for the spindle.
(Note) Check the phenomenon caused by the load
fluctuation.
The alarm occurs.
Lower the speed loop gain (SV005/SP005) to
the level at which the alarm does not occur.
◯◯
The alarm does not occur. Check the investigation item No. 3.
3
For the servo, perform the rapid traverse feed
repeatedly and check if the max. current value is
within the tolerable value.
For the spindle, check the load meter value at the
unloaded max. rotation speed.
The displayed value is high.
Increase the current loop gain.
Servo: SV009 to 012
Spindle: SP077 to 080 and SP081 to 084
◯◯
The displayed value is appropriate. Check the investigation item No. 4.
4
Disconnect the power cable (U,V,W) from the
terminal block and the cannon plug from the motor.
Check the insulation of the cable and motor with a
tester.
The resistance value of the power cable for
each phase is not " ∞".
Replace the motor power cable.
◯◯
The resistance value of the motor terminal
and unit (shaft) is 1MΩ or less.
Replace the motor.(Note) For the motors
equipped with the absolute position encoder,
the zero point must be established.
The values below are met when measured
with a tester.
Cable: ∞
Motor terminal - unit:1MΩ or more
Check the investigation item No. 5.
5
Check the insulation between the motor power
cable and FG.
There is a ground fault at the power cable. Replace the motor power cable.
◯◯
There is no problem. Check the investigation item No. 6.
6
Check if there is any abnormality in the motor's
ambient environment.
(Ex. Ambient temperature, cutting water)
Take remedies according to the causes of the abnormality in the ambient environment.
◯◯