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6 Troubleshooting
MITSUBISHI CNC
6-2-2 List of warnings
When a warning occurs, a warning No. will appear on the NC monitor screen and with the LEDs on the front
of the drive unit. Check the warning No., and remove the cause of the warning by following this list.
(1) Drive unit warning
(Note1) Definitions of terms in the table are as follows.
Main side detector: Detector connected to CN2 Sub side detector: Detector connected to CN3
(Note 2) Resetting methods
* : Automatically reset once the cause of the warning is removed.
NR: Reset with the NC RESET button. This warning can also be reset with the PR and AR resetting conditions.
PR: Reset by turning the NC power ON again. This warning can also be reset with the AR resetting conditions.
When the control axis is removed, this warning can be reset with the NC RESET button. (Excluding warning 93.)
AR: Reset by turning the servo drive unit power ON again.
(Note 3) Servo and spindle motor do not stop when the warning occurs.
(Note 4) When an emergency stop is input, servo and spindle motor decelerate to a stop.
(When SV048, SV055 or SV056 is set for servo and when SP055 or SP056 is set for spindle.)
No. Name Details
Reset
method
Stop method
96 Scale feedback error
An excessive difference in feedback amount was detected between the
main side detector and the MPI scale in MPI scale absolute position de-
tection system.
*-
97 Scale offset error
An error was detected in the offset data that is read at the NC power-
ON in MPI scale absolute position detection system.
PR -
9B
Incremental detector/
magnetic pole shift warning
The difference between the magnetic pole position after the phase Z
has been passed (magnetic pole shift amount:SV028) and the initially
detected position is excessive in the built-in motor's incremental control
system.The magnetic pole is controlled by the initial detection value.
*-
9E
Absolute position detector: Revolution
counter error
An error was detected in the revolution counter data of the absolute po-
sition detector. The accuracy of absolute position is not guaranteed.
*-
9F Battery voltage drop
The battery voltage to be supplied to the absolute position detector is
dropping.
*-
A3
Distance-coded reference check / initial
setup warning
This warning is detected until the axis reaches the reference position
during the initial setup of the distance-coded reference check function.
This warning turns OFF after the axis has reached the position, thus set
the value displayed on the drive monitor to the parameter.
*-
A6 Fan stop warning A cooling fan in the drive unit stopped. * -
E0 Overregeneration warning Over-regeneration detection level exceeded 80%. * -
E1 Overload warning A level of 80% of the Overload 1 alarm state was detected. * -
E4 Parameter warning
An incorrect set value was detected among the parameters send from
the NC in the normal operation.
*-
E6 Control axis detachment warning A control axis is being detached. (State display) * -
E7 NC emergency stop In NC emergency stop. (State display) *
Deceleration stop
enabled
E8
to
EF
Power supply warning
The power supply unit detected a warning. The error details are differ-
ent according to the connected power supply unit.
*
-
*EA:
Deceleration stop
enabled
E9
Instantaneous power interruption
warning
The control power was shut OFF for 25ms or more. - -
EA In external emergency stop state External emergency stop signal was input. - -