รวม MITSUBISHI MDS-A.MDS-B,MDS-C1 SERVO ALARM CODE

power ON again.
Alarm No. Name Meaning
10 Insufficient voltage Insufficient PN bus voltage was detected in main circuit.
11 Axis selection error Setting of the axis No. selection switch is incorrect.
12 Memory error 1 A CPU error or an internal memory error was detected during the
power ON self-check.
13 Software processing
error 1
Software processing has not finished within the specified time.
14 Software processing
error 2
Software processing has not finished within the specified time.
15 Memory error 2 A CPU error or an internal memory error was detected during the
power ON self-check.
16 Magnetic pole
position detection
error
Initial magnetic pole for motor control has not been formed yet.
17 A/D converter error An error was detected in the A/D converter for detecting current FB.
18 Motor side detector:
Initial
communication error
Initial communication with the motor end detector failed.
19 Detector
communication error
in synchronous
control
Initial communication with the motor end detector on master axis
failed when setting closed-loop current synchronous control. Or the
communication was interrupted.

1A Machine side
detector: Initial
communication error
Initial communication with the linear scale or the ball screw end
detector failed.
1B Machine side
detector:
CPU error 1
CPU initial error was detected in the linear scale or in the ball screw
end detector.
1C Machine side
detector:
EEPROM/LED error
An error was detected in the stored data of the linear scale memory.
Or the LED deterioration was detected in the ball screw end
detector.
1D Machine side
detector: Data error
An error data was detected in the linear scale or in the ball screw end
detector.
1E Machine side
detector: Memory
error
An internal memory error was detected in the linear scale.
1F Machine side
detector:
Communication
error
An error was detected in communication data with the linear scale or
the ball screw end detector. Or the communication was interrupted.
20 Motor side detector:
No signal
No signals were detected in A,B,Z-phase or U,V,W-phase of the
pulse motor end detector in a servo system, or in Z-phase of PLG in
a spindle system.
21 Machine side
detector: No signal
No signals were detected in A,B,Z-phase of the pulse linear scale or
the ball screw end detector in a servo system. Or no encoder signals
were detected in a spindle system.
22 LSI error LSI operation error was detected in the drive unit.
23 Excessive speed
error 1
A difference between the speed command and speed feedback was
continuously exceeding 50 r/min for longer than the setting time.
24 Grounding The motor power cable is in contact with FG (Frame Ground).
25 Absolute position
data lost
The absolute position was lost, as the backup battery voltage
dropped in the absolute position detector.
26 Unused axis error A power module error occurred in the axis whose axis No. selection
switch was set to "F"(free axis).
27 Machine side
detector:
CPU error 2
A CPU error was detected in the linear scale.
28 Machine side
detector: Overspeed
The specified max. speed was detected in the linear scale.
29 Machine side
detector: Absolute
position data error
An error was detected in the absolute position detection circuit of the
linear scale.
2A Machine side
detector: Relative
position data error
An error was detected in the relative position detection circuit of the
linear scale.
2B Motor side detector:
CPU error 1
A CPU initial error was detected in the motor end detector or in the
linear scale of a linear servo system.
2C Motor side detector:
EEPROM/LED error
The LED deterioration was detected in the motor end detector. Or
an error was detected in the stored data of the linear scale memory
of a linear servo system.

2D Motor side detector:
Data error
A data error was detected in the motor end detector or in the linear
scale of a linear servo system.
2E Motor side detector:
Memory error
An internal memory error was detected in the linear scale of a linear
servo system.
2F Motor side detector:
Communication
error
An error was detected in communication data with the motor end
detector or with the linear scale of a linear servo system. Or the
communication was interrupted.
30 Over regeneration Over-regeneration detection level became over 100%. The
regenerative resistor is overloaded.
31 Overspeed The motor was detected to rotate at a speed exceeding the allowable
speed.
32 Power module
overcurrent
Overcurrent protection function in the power module has started its
operation.
33 Overvoltage PN bus voltage in main circuit exceeded the allowable value.
34 NC-DRV
communication:
CRC error
An error was detected in the data received from the CNC.
35 NC command error The travel command data that was received from the CNC was
excessive.
36 NC-DRV
communication:
Communication
error
The communication with the CNC was interrupted.
37 Initial parameter
error
An incorrect parameter was detected among the parameters
received from the CNC at the power ON.
38 NC-DRV
communication:
Protocol error 1
An error was detected in the communication frames received from
the CNC.
39 NC-DRV
communication:
Protocol error 2
An error was detected in the axis information data received from the
CNC.
3A Overcurrent Excessive current was detected in the motor drive current.
3B Power module
overheat
Thermal protection function in the power module has started its
operation.
3C Regeneration circuit
error
An error was detected in the regenerative transistor or in the
regenerative resistor.
3D Spindle speed
blocked
The spindle motor failed to rotate faster than 45 r/min, even when the
max. torque command was given.
3E Spindle speed
overrun
1. The spindle motor speed feedback was detected to be
accelerated exceeding the commanded speed.
2. The spindle motor was detected to be rotated at a speed
exceeding the parameter value, while the speed command was "0"
(including the case of operation stoppage during the position
control).
3F Excessive speed
error 2
A difference between the speed command and speed feedback was
detected to exceed the setting amount or setting time in a constant
speed operation.

40 Detector selection
unit switching error
An error was detected in the motor switching signals that were
received from the detector selection unit, while controlling one drive
unit and two motors.
41 Detector selection
unit communication
error
An error was detected in the communication with the detector
selection unit, while controlling one drive unit and two motors.
42 Feedback error 1 An error was detected in the feedback signals of the pulse motor end
detector in a servo system, or in PLG's feedback signals in a spindle
system.
43 Feedback error 2 Excessive difference was detected in position data between the
motor end detector and the machine end detector in a servo system.
In a spindle system, an error was detected in the encoder feedback
signals.
44 Inappropriate coil
selected for C axis
When using a coil changeover motor, C-axis was controlled while the
high-speed coil was selected.
45 Fan stop A cooling fan built in the drive unit stopped, and the loads on the unit
exceeded the specified value.
46 Motor overheat Thermal protection function of the motor or in the detector, has
started its operation.
47 Regenerative
resistor overheat
Thermal protection function of the regenerative resistor, has started
its operation.
48 Motor side detector:
CPU error 2
A CPU error was detected in the linear scale of a linear servo
system.
49 Motor side detector:
Overspeed
The specified max. speed was detected in the linear scale of the
linear servo system.
4A Motor side detector:
Absolute position
data error
An error was detected in the absolute position detection circuit in the
linear scale of a linear servo system.
4B Motor side detector:
Relative position
data error
An error was detected in the relative position detection circuit in the
linear scale of a linear servo system.
4C Current error at
magnetic pole
detection
A current error was detected in the IPM spindle motor when the
initial magnetic pole was being formed.
4E NC command mode
error
The mode outside the specification was input in spindle control mode
selection.
4F Instantaneous
power interruption
The power was momentarily interrupted.
50 Overload 1 Overload detection level became over 100%. The motor or the drive
unit is overloaded.
51 Overload 2 Current command of more than 95% of the unit's max. current was
being continuously given for longer than 1 second in a servo system.
In a spindle system, the load over the continuous rating was being
applied for longer than 30 minutes.
52 Excessive error 1 A difference between the actual and theoretical motor positions
during servo ON exceeded the setting value in a servo system. In a
spindle system, a difference between the position command and
position feedback exceeded the setting value.

53 Excessive error 2 A difference between the actual and theoretical motor positions
during servo OFF exceeded the setting value.
54 Excessive error 3 When an excessive error 1 occurred, detection of the motor current
failed.
55 External emergency
stop error
There is no contactor shutoff command, even after 30 seconds has
passed since the external emergency stop was input.
57 Option error An invalid option function was selected.
58 Collision detection 1:
G0
When collision detection function was valid, the disturbance torque
in rapid traverse (G0) exceeded the collision detection level.
59 Collision detection 1:
G1
When collision detection function was valid, the disturbance torque
in cutting feed (G1) exceeded the collision detection level.
5A Collision detection 2 When collision detection function was valid, the command torque
reached the max. motor torque.
5C Orientation feedback
error
After orientation was achieved, a difference between the command
and feedback exceeded the parameter setting.
5D Speed monitoring:
Input mismatch
As for door state signal of speed monitoring control, a mismatch
between the external input signal and the control signal received
from the CNC was detected.
5E Speed monitoring:
Feedback speed
error
In speed monitoring control, the spindle speed was exceeding the
setting speed with the door open.
5F External contactor
error
A contact of the external contactor is welding. Or the contactor fails
to be ON during ready ON.
61 Power module
overcurrent
Overcurrent protection function in the power module has started its
operation.
62 Frequency error The input power supply frequency increased above the specification
range.
63 Supplementary
regeneration error
The supplementary regenerative transistor is being ON.
65 Rush relay error A resistor relay for rush short circuit fails to be ON.
67 Phase interruption An open-phase condition was detected in input power supply circuit.
68 Watchdog The system does not operate correctly.
69 Grounding The motor power cable is in contact with FG (Frame Ground).
6A External contactor
welding
A contact of the external contactor is welding.
6B Rush relay welding A resistor relay for rush short circuit fails to be OFF.
6C Main circuit error An error was detected in charging operation of the main circuit
capacitor.
6D Parameter error The capacity of the power supply unit and the regenerative resistor
type that was set in the parameter are mismatched.
6E Memory error An internal memory error was detected.
6F Power supply error A power supply unit is not connected. Or an error was detected in
A/D converter of the power supply unit.
71 Instantaneous
power interruption
The power was momentarily interrupted

73 Over regeneration Over-regeneration detection level became over 100%. The
regenerative resistor is overloaded.
74 Regenerative
resistor overheat
Thermal protection function of the regenerative resistor, has started
its operation.
75 Overvoltage PN bus voltage in main circuit exceeded the allowable value.
76 External emergency
stop setting error
As for the external emergency stop settings, the setting on the rotary
switch and the parameter setting are mismatched.
77 Power module
overheat
Thermal protection function in the power module has started its
operation.
7F Drive unit power
supply restart
request
A mismatch of program mode selection was detected. Turn the drive
unit power ON again.
80 Detector converting
unit 1: Connection
error
A connection error was detected between the analog output linear
scale and the unit MDS-B-HR that is used in a linear servo system.
81 Detector converting
unit 1:
Communication
error
A communication error was detected between the serial output linear
scale and the unit MDS-B-HR that is used in a linear servo system.
83 Detector converting
unit 1: Judgment
error
Judgment of the linear scale analog frequency failed in the unit
MDS-B-HR that is used in a linear servo system.
84 Detector converting
unit 1: CPU error
A CPU error was detected in the unit MDS-B-HR that is used in a
linear servo system.
85 Detector converting
unit 1: Data error
A data error was detected in the unit MDS-B-HR that is used in a
linear servo system.
86 Detector converting
unit 1: Magnetic pole
error
An error was detected in the magnetic pole of the unit MDS-B-HR
that is used in a linear servo system.
88 Watchdog The system does not operate correctly.
89 Detector converting
unit 2: Connection
error
A connection error was detected between the analog output linear
scale and the unit MDS-B-HR in a servo system. In a spindle
system, the initial communication with MDS-B-PJEX failed.

8A Detector converting
unit 2:
Communication
error
An error was detected in the communication with the serial output
linear scale of the unit MDS-B-HR in a servo system. In a spindle
system, an error was detected in the communication with
MDS-B-PJEX.
8B Detector converting
unit 2: Automatic
tuning error
An abnormal signal was detected from PLG in automatic PLG tuning.
8C Detector converting
unit 2: Judgment
error
The detector type outside the specification was designated in
MDS-B-PJEX.
8D Detector converting
unit 2: CPU error
A CPU error was detected in the unit MDS-B-HR in a servo system,
or in the unit MDS-B-PJEX in a spindle system.
8E Detector converting
unit 2: Data error
A data error was detected in the unit MDS-B-HR.