Mitsubishi Electric MELSERVO-J4 series User manual

General-Purpose AC Servo
Servo Amplifier Instruction Manual
(Troubleshooting)

1
SAFETY PRECAUTIONS
(Please read the instructions carefully before using the equipment.)
To use the equipment correctly, do not attempt to install, operate, maintain, or inspect the equipment until you have read
through this Instruction Manual, Installation guide, and appended documents carefully. Do not use the equipment until you
have a full knowledge of the equipment, safety information and instructions.
In this Instruction Manual, the safety instruction levels are classified into "WARNING" and "CAUTION".
Note that the CAUTION level may lead to a serious consequence according to conditions.
Please follow the instructions of both levels because they are important to personnel safety.
What must not be done and what must be done are indicated by the following diagrammatic symbols.
In this Instruction Manual, instructions at a lower level than the above, instructions for other functions, and so on are classified
into "POINT".
After reading this Instruction Manual, keep it accessible to the operator.
WARNING
Indicates that incorrect handling may cause hazardous conditions, resulting in
death or severe injury.
CAUTION
Indicates that incorrect handling may cause hazardous conditions, resulting in
minor or moderate injury or property damage.
Indicates what must not be done. For example, "No Fire" is indicated by .
Indicates what must be done. For example, grounding is indicated by .

2
[To prevent electric shock, note the following]
[To prevent fire, note the following]
[To prevent injury, note the following]
[Additional instructions]
[Wiring]
WARNING
●Before wiring or inspection, turn off the power and wait for 15 minutes or more (20 minutes or more for
converter unit) until the charge lamp turns off. Then, confirm that the voltage between P+ and N-
(between L+ and L- for converter unit) is safe with a voltage tester and others. Otherwise, an electric
shock may occur. In addition, always confirm whether the charge lamp is off or not from the front of
the servo amplifier (converter unit).
●Do not operate switches with wet hands. Otherwise, it may cause an electric shock.
CAUTION
●When you use an MR-J4 multi-axis servo amplifier, connecting an encoder for wrong axis to the
CN2A, CN2B, or CN2C connector may cause a fire.
CAUTION
●The servo amplifier (drive unit), converter unit heat sink, regenerative resistor, servo motor, etc. may
become hot while power is on or for some time after power-off. Take safety measures, e.g. provide
covers, to avoid accidentally touching the parts (cables, etc.) by hand.
The following instructions should also be fully noted. Incorrect handling may cause a malfunction, injury, electric shock, etc.
CAUTION
●Wire the equipment correctly and securely. Otherwise, the servo motor may operate unexpectedly.
●Make sure to connect the cables and connectors by using the fixing screws and the locking
mechanism. Otherwise, the cables and connectors may be disconnected during operation.
●To avoid a malfunction of the servo motor, connect the wires to the correct phase terminals (U/V/W) of
the servo amplifier (drive unit) and the servo motor.
●Connect the servo amplifier (drive unit) power output (U/V/W) to the servo motor power input (U/V/W)
directly. Do not connect a magnetic contactor and others between them. Otherwise, it may cause a
malfunction.
U
Servo motor
M
V
W
U
V
W
U
M
V
W
U
V
W
Servo amplifier
(drive unit) Servo motor
Servo amplifier
(drive unit)

3
[Usage]
[Corrective actions]
CAUTION
●Configure a circuit to turn off EM2 or EM1 when the main circuit power supply is turned off to prevent
an unexpected restart of the servo amplifier (drive unit).
●To prevent malfunction, avoid bundling power lines (input/output) and signal cables of the servo
amplifier (drive unit) and the converter unit together or running them in parallel to each other. Separate
the power lines from the signal cables.
CAUTION
●Before resetting an alarm, make sure that the run signal of the servo amplifier (drive unit) is off in
order to prevent a sudden restart. Otherwise, it may cause an accident.
●Use the servo amplifier (drive unit) and converter unit with the specified servo motor.
●Wire options and peripheral equipment, etc. correctly in the specified combination. Otherwise, it may
cause an electric shock, fire, injury, etc.
●If the dynamic brake is activated at power-off, alarm occurrence, etc., do not rotate the servo motor by
an external force. Otherwise, it may cause a fire.
CAUTION
●Ensure safety by confirming the power off, etc. before performing corrective actions. Otherwise, it may
cause an accident.
●If it is assumed that a power failure or product malfunction may result in a hazardous situation, use a
servo motor with an electromagnetic brake or provide an external brake system for holding purpose to
prevent such hazard.
●Configure an electromagnetic brake circuit which is interlocked with an external emergency stop
switch.
●When an alarm occurs, eliminate its cause, ensure safety, and deactivate the alarm to restart
operation.
●If the molded-case circuit breaker or fuse is activated, be sure to remove the cause and secure safety
before switching the power on. If necessary, replace the servo amplifier (drive unit) and converter unit,
and recheck the wiring. Otherwise, it may cause smoke, fire, or an electric shock.
●Provide an adequate protection to prevent unexpected restart after an instantaneous power failure.
●After an earthquake or other natural disasters, ensure safety by checking the conditions of the
installation, mounting, wiring, and equipment before switching the power on to prevent an electric
shock, injury, or fire.
Servo motor
Electromagnetic brake
B
U
RA
Contacts must be opened with
the emergency stop switch.
Contacts must be opened when ALM
(Malfunction) or MBR (Electromagnetic
brake interlock) turns off.
24 V DC

4
ABOUT THE MANUAL
This Instruction Manual covers the following models. These include servo amplifiers (drive units) which have optional units.
 MR-J4-_A/MR-J4-_A4/MR-J4-_A1/MR-J4-_A-RJ/MR-J4-_A4-RJ/MR-J4-_A1-RJ
 MR-J4-_B/MR-J4-_B4/MR-J4-_B1/MR-J4-_B-RJ/MR-J4-_B4-RJ/MR-J4-_B1-RJ
 MR-J4W_-_B
 MR-J4-_B-RJ010/MR-J4-_B4-RJ010
 MR-J4-03A6/MR-J4-03A6-RJ/MR-J4W2-0303B6
 MR-J4-_GF/MR-J4-_GF4/MR-J4-_GF1/MR-J4-_GF-RJ/MR-J4-_GF4-RJ/MR-J4-_GF1-RJ
 MR-J4-DU_A/MR-J4-DU_A4/MR-J4-DU_A-RJ/MR-J4-DU_A4-RJ
 MR-J4-DU_B/MR-J4-DU_B4/MR-J4-DU_B-RJ/MR-J4-DU_B4-RJ/MR-J4-DU_B4-RJ100
 MR-CV_
 MR-CR55K/MR-CR55K4
The symbols in the target column mean as follows.
[A] MR-J4-_A/MR-J4-_A4/MR-J4-_A1/MR-J4-_A-RJ/MR-J4-_A4-RJ/MR-J4-_A1-RJ/MR-J4-DU_A/ MR-J4-DU_A4/
MR-J4-DU_A-RJ/MR-J4-DU_A4-RJ/MR-J4-03A6/MR-J4-03A6-RJ
[B] MR-J4-_B/MR-J4-_B4/MR-J4-_B1/MR-J4-_B-RJ/MR-J4-_B4-RJ/MR-J4-_B1-RJ/ MR-J4-DU_B/MR-J4-DU_B4/
MR-J4-DU_B-RJ/MR-J4-DU_B4-RJ/MR-J4-DU_B4-RJ100
[WB] MR-J4W_-_B/MR-J4W2-0303B6
[RJ010] MR-J4-_B-RJ010/MR-J4-_B4-RJ010
[GF] MR-J4-_GF/MR-J4-_GF4/MR-J4-_GF1/MR-J4-_GF-RJ/MR-J4-_GF4-RJ/MR-J4-_GF1-RJ
[Other] For manufacturer adjustment

5
CONTENTS
CONTENTS
SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
ABOUT THE MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
CHAPTER 1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT) 6
1.1 Explanation for the lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Alarm list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Warning list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1.4 Remedies for alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1.5 Remedies for warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
1.6 Trouble which does not trigger alarm/warning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
1.7 Network module error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
CHAPTER 2 TROUBLESHOOTING FOR MR-CV_POWER REGENERATION CON-
VERTER UNIT 138
2.1 Explanations of the lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
2.2 Alarm list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
2.3 Warning list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
2.4 Remedies for alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
2.5 Remedies for warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
CHAPTER 3 TROUBLESHOOTING FOR MR-CR55K(4) RESISTANCE REGENERATION
CONVERTER UNIT 145
3.1 Explanation for the lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
3.2 Alarm/warning list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
3.3 Remedies for alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
3.4 Remedies for warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
CHAPTER 4 DRIVE RECORDER 153
4.1 How to use drive recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
4.2 How to display drive recorder information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
APPENDIX 161
Appendix 1 Detection points of [AL. 25], [AL. 92], and [AL. 9F] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
REVISIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .169
TRADEMARKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .170

61 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.1 Explanation for the lists
1TROUBLESHOOTING FOR SERVO AMPLIFIER
(DRIVE UNIT)
• As soon as an alarm occurs, turn SON (Servo-on) off and interrupt the power.
• [AL. 37 Parameter error] and warnings (except [AL. F0 Tough drive warning]) are not recorded in the alarm
history.
• [AL. 8D.1 CC-Link IE communication error 1] and [AL. 8D.2 CC-Link IE communication error 2] are not
recorded in the alarm history. For MR-J4-_GF_(-RJ), these alarms are recorded by setting [Pr. PN06] to "_ _
_ 1".
When an error occurs during operation, the corresponding alarm or warning is displayed.
When an alarm occurs, ALM will turn off. Refer to the following and take the appropriate action.
Page 28 Remedies for alarms
When an warning is displayed, refer to the following and take the appropriate action.
Page 101 Remedies for warnings
1.1 Explanation for the lists
No./Name/Detail No./Detail name
Indicates each No./Name/Detail No./Detail name of alarms or warnings.
Stop method
For the alarms and warnings in which "SD" is written in the stop method column, the servo motor stops with the dynamic
brake after forced stop deceleration. For the alarms and warnings in which "DB" or "EDB" is written in the stop method
column, the servo motor stops with the dynamic brake without forced stop deceleration.
Alarm deactivation
After its cause has been removed, the alarm can be deactivated in any of the methods marked  in the alarm deactivation
column. Warnings are automatically canceled after the cause of occurrence is removed. Alarms are deactivated with alarm
reset, CPU reset, or cycling the power.
■MR-J4-_A_(-RJ)/MR-J4-DU_A_(-RJ)
■MR-J4-_B_(-RJ010)/MR-J4W_-_B/MR-J4-DU_B_(-RJ)/MR-J4-_GF_(-RJ)
Processing system (only for MR-J4W_-_B_)
Processing system of alarms is as follows.
Each axis: Alarm is detected for each axis.
Common: Alarm is detected as the whole servo amplifier.
Alarm deactivation Explanation
Alarm reset 1. Turning on RES (Reset) with input device
2. Pushing the "SET" button while the display of the servo amplifier is the current alarm display status
3. Click "Occurring Alarm Reset" in the "Alarm Display" window of MR Configurator2
Cycling the power Turning the power off and then turning it on again.
Alarm deactivation Explanation
Alarm reset 1. Reset command from controller
2. Click "Occurring Alarm Reset" in the "Alarm Display" window of MR Configurator2
CPU reset Resetting the controller itself
Cycling the power Turning the power off and then turning it on again.

1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list 7
1
Stop system (only for MR-J4W_-_B_)
This means target axis to stop when the alarm occurs.
Each axis: Only alarming axis will stop.
All axes: All axes will stop.
Alarm code (only MR-J4-_A_(-RJ)/MR-J4-DU_A_(-RJ))
To output alarm codes, set [Pr. PD34] to "_ _ _ 1" when using an MR-J4-_A_(-RJ)/MR-J4-DU_A_(-RJ). Alarm codes are
outputted by on/off of bit 0 to bit 2. Warnings ([AL. 90] to [AL. F3]) do not have alarm codes. The alarm codes in the following
table will be outputted when they occur. The alarm codes will not be outputted in normal condition.
When using an MR-D01 extension IO unit, you can output alarm codes by setting [Pr. Po12] to "_ _ _ 1". Alarm codes are
outputted by on/off of bit 0 to bit 3.
1.2 Alarm list
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)
10 Undervoltage 10.1 Voltage drop in
the control
circuit power
EDB  CommonAll axes0010
10.2 Voltage drop in
the main circuit
power
SD  Common All axes
11 Switch setting
error
11.1 Axis number
setting error/
Station number
setting error
DB  Common All axes 
11.2 Disabling
control axis
setting error
DB  Common All axes 
12 Memory error
1 (RAM)
12.1 RAM error 1 DB  CommonAll axes0000
12.2 RAM error 2 DB  Common All axes
12.3 RAM error 3 DB  Common All axes
12.4 RAM error 4 DB  Common All axes
12.5 RAM error 5 DB  Common All axes
12.6 RAM error 6 DB    
13 Clock error 13.1 Clock error 1 DB  CommonAll axes0000
13.2 Clock error 2 DB  Common All axes
13.3 Clock error 3 DB     

81 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list
14 Control
process error
14.1 Control process
error 1
DB  CommonAll axes0000
14.2 Control process
error 2
DB  Common All axes
14.3 Control process
error 3
DB  Common All axes
14.4 Control process
error 4
DB  Common All axes
14.5 Control process
error 5
DB  Common All axes
14.6 Control process
error 6
DB  Common All axes
14.7 Control process
error 7
DB  Common All axes
14.8 Control process
error 8
DB  Common All axes
14.9 Control process
error 9
DB  Common All axes
14.A Control process
error 10
DB  Common All axes
14.B Control process
error 11
DB    
14.C Control process
error 12
DB    
14.D Control process
error 13
DB    
15 Memory error
2
(EEP-ROM)
15.1 EEP-ROM error
at power on
DB  CommonAll axes0000
15.2 EEP-ROM error
during operation
DB  Common All axes
15.4 Home position
information read
error
DB   
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)

1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list 9
1
16 Encoder initial
communication
error 1
16.1 Encoder initial
communication
- Receive data
error 1
DB  Each axis Each
axis
0110
16.2 Encoder initial
communication
- Receive data
error 2
DB  Each axis Each
axis
16.3 Encoder initial
communication
- Receive data
error 3
DB  Each axis Each
axis
16.4 Encoder initial
communication
- Encoder
malfunction *6
DB  Each axis Each
axis
16.5 Encoder initial
communication
- Transmission
data error 1
DB  Each axis Each
axis
16.6 Encoder initial
communication
- Transmission
data error 2
DB  Each axis Each
axis
16.7 Encoder initial
communication
- Transmission
data error 3
DB  Each axis Each
axis
16.8 Encoder initial
communication
- Incompatible
encoder *6
DB  Each axis Each
axis
16.A Encoder initial
communication
- Process error
1
DB  Each axis Each
axis
16.B Encoder initial
communication
- Process error
2
DB  Each axis Each
axis
16.C Encoder initial
communication
- Process error
3
DB  Each axis Each
axis
16.D Encoder initial
communication
- Process error
4
DB  Each axis Each
axis
16.E Encoder initial
communication
- Process error
5
DB  Each axis Each
axis
16.F Encoder initial
communication
- Process error
6
DB  Each axis Each
axis
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)

10 1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list
17 Board error 17.1 Board error 1 DB  CommonAll axes0000
17.3 Board error 2 DB  Common All axes
17.4 Board error 3 DB  Common All axes
17.5 Board error 4 DB  Common All axes
17.6 Board error 5 DB  Common All axes
17.7 Board error 7 DB   
17.8 Board error 6 *6 EDB  Common All axes
17.9 Board error 8 DB    
19 Memory error
3 (Flash-ROM)
19.1 Flash-ROM
error 1
DB  CommonAll axes0000
19.2 Flash-ROM
error 2
DB  Common All axes
19.3 Flash-ROM
error 3
DB    
1A Servo motor
combination
error
1A.1 Servo motor
combination
error 1
DB  Each axis Each
axis
0110
1A.2 Servo motor
control mode
combination
error
DB  Each axis Each
axis
1A.4 Servo motor
combination
error 2
DB  Each axis Each
axis
1B Converter error 1B.1 Converter unit
error
DB    0010
1E Encoder initial
communication
error 2
1E.1 Encoder
malfunction
DB  Each axis Each
axis
0110
1E.2 Load-side
encoder
malfunction
DB  Each axis Each
axis
1F Encoder initial
communication
error 3
1F.1 Incompatible
encoder
DB  Each axis Each
axis
0110
1F.2 Incompatible
load-side
encoder
DB  Each axis Each
axis
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)

1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list 11
1
20 Encoder
normal
communication
error 1
20.1 Encoder normal
communication
- Receive data
error 1
EDB  Each axis Each
axis
0110
20.2 Encoder normal
communication
- Receive data
error 2
EDB  Each axis Each
axis
20.3 Encoder normal
communication
- Receive data
error 3
EDB  Each axis Each
axis
20.5 Encoder normal
communication
- Transmission
data error 1
EDB  Each axis Each
axis
20.6 Encoder normal
communication
- Transmission
data error 2
EDB  Each axis Each
axis
20.7 Encoder normal
communication
- Transmission
data error 3
EDB  Each axis Each
axis
20.9 Encoder normal
communication
- Receive data
error 4
EDB  Each axis Each
axis
20.A Encoder normal
communication
- Receive data
error 5
EDB  Each axis Each
axis
21 Encoder
normal
communication
error 2
21.1 Encoder data
error 1
EDB  Each axis Each
axis
0110
21.2 Encoder data
update error
EDB  Each axis Each
axis
21.3 Encoder data
waveform error
EDB  Each axis Each
axis
21.4 Encoder non-
signal error
EDB  Each axis Each
axis
21.5 Encoder
hardware error
1
EDB  Each axis Each
axis
21.6 Encoder
hardware error
2
EDB  Each axis Each
axis
21.9 Encoder data
error 2
EDB  Each axis Each
axis
24 Main circuit
error
24.1 Ground fault
detected by
hardware
detection circuit
DB  Each axisAll axes1100
24.2 Ground fault
detected by
software
detection
function
DB  Each axis All axes
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)

12 1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list
25 Absolute
position erased
25.1 Servo motor
encoder -
Absolute
position erased
DB  Each axis Each
axis
1110
25.2 Scale
measurement
encoder -
Absolute
position erased
DB  Each axis Each
axis
27 Initial magnetic
pole detection
error
27.1 Initial magnetic
pole detection -
Abnormal
termination
DB  Each axis Each
axis
1110
27.2 Initial magnetic
pole detection -
Time out error
DB  Each axis Each
axis
27.3 Initial magnetic
pole detection -
Limit switch
error
DB  Each axis Each
axis
27.4 Initial magnetic
pole detection -
Estimated error
DB  Each axis Each
axis
27.5 Initial magnetic
pole detection -
Position
deviation error
DB  Each axis Each
axis
27.6 Initial magnetic
pole detection -
Speed deviation
error
DB  Each axis Each
axis
27.7 Initial magnetic
pole detection -
Current error
DB  Each axis Each
axis
28 Linear encoder
error 2
28.1 Linear encoder -
Environment
error
EDB  Each axis Each
axis
0110
2A Linear encoder
error 1
2A.1 Linear encoder
error 1-1
EDB  Each axis Each
axis
0110
2A.2 Linear encoder
error 1-2
EDB  Each axis Each
axis
2A.3 Linear encoder
error 1-3
EDB  Each axis Each
axis
2A.4 Linear encoder
error 1-4
EDB  Each axis Each
axis
2A.5 Linear encoder
error 1-5
EDB  Each axis Each
axis
2A.6 Linear encoder
error 1-6
EDB  Each axis Each
axis
2A.7 Linear encoder
error 1-7
EDB  Each axis Each
axis
2A.8 Linear encoder
error 1-8
EDB  Each axis Each
axis
2B Encoder
counter error
2B.1 Encoder
counter error 1
EDB  Each axis Each
axis
1110
2B.2 Encoder
counter error 2
EDB  Each axis Each
axis
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)

1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list 13
1
30 Regenerative
error
30.1 Regeneration
heat error
DB *1 *1 *1 CommonAll axes0001
30.2 Regeneration
signal error
DB *1 *1 *1 Common All axes
30.3 Regeneration
feedback signal
error
DB *1 *1 *1 Common All axes
31 Overspeed 31.1 Abnormal motor
speed
SD  Each axis Each
axis
0101
32 Overcurrent 32.1 Overcurrent
detected at
hardware
detection circuit
(during
operation)
DB  Each axisAll axes0100
32.2 Overcurrent
detected at
software
detection
function (during
operation)
DB  Each axis All axes
32.3 Overcurrent
detected at
hardware
detection circuit
(during a stop)
DB  Each axis All axes
32.4 Overcurrent
detected at
software
detection
function (during
a stop)
DB  Each axis All axes
33 Overvoltage 33.1 Main circuit
voltage error
EDB  CommonAll axes1001
34 SSCNET
receive error 1
34.1 SSCNET
receive data
error
SD*10 
*5 Common All axes 
34.2 SSCNET
connector
connection error
SD*10  Common All axes 
34.3 SSCNET
communication
data error
SD*10  Each axis Each
axis

34.4 Hardware error
signal detection
SD*10  Common All axes 
34.5 SSCNET
receive data
error (safety
observation
function)
SD*10     
34.6 SSCNET
communication
data error
(safety
observation
function)
SD*10     
35 Command
frequency error
35.1 Command
frequency error
SD  Each axis Each
axis
1101
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)

14 1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list
36 SSCNET
receive error 2
36.1 Continuous
communication
data error
SD*10  Each axis Each
axis

36.2 Continuous
communication
data error
(safety
observation
function)
SD*10     
37 Parameter
error
37.1 Parameter
setting range
error
DB  Each axis Each
axis
1000
37.2 Parameter
combination
error
DB  Each axis Each
axis
37.3 Point table
setting error
DB   
39 Program error 39.1 Program error DB    0000
39.2 Instruction
argument
external error
DB   
39.3 Register No.
error
DB   
39.4 Non-
correspondence
instruction error
DB   
3A Inrush current
suppression
circuit error
3A.1 Inrush current
suppression
circuit error
EDB  CommonAll axes0000
3D Parameter
setting error for
driver
communication
3D.1 Parameter
combination
error for driver
communication
on slave
DB    
3D.2 Parameter
combination
error for driver
communication
on master
DB    
3E Operation
mode error
3E.1 Operation mode
error
DB  Each axis Each
axis

3E.6 Operation mode
switch error
DB    1000
3E.8 MR-D30
combination
error
DB    
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)

1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list 15
1
42 Servo control
error
(for linear
servo motor
and direct
drive motor)
42.1 Servo control
error by position
deviation
EDB *4 *4 Each axis Each
axis
0110
42.2 Servo control
error by speed
deviation
EDB *4 *4 Each axis Each
axis
42.3 Servo control
error by torque/
thrust deviation
EDB *4 *4 Each axis Each
axis
Fully closed
loop control
error
(for fully closed
loop control)
42.8 Fully closed
loop control
error by position
deviation
EDB *4 *4 Each axis Each
axis
42.9 Fully closed
loop control
error by speed
deviation
EDB *4 *4 Each axis Each
axis
42.A Fully closed
loop control
error by position
deviation during
command stop
EDB *4 *4 Each axis Each
axis
45 Main circuit
device
overheat
45.1 Main circuit
device overheat
error 1
SD *1 *1 *1 CommonAll axes0011
45.2 Main circuit
device overheat
error 2
SD *1 *1 *1 Common All axes
46 Servo motor
overheat
46.1 Abnormal
temperature of
servo motor 1
SD *1 *1 *1 Each axis Each
axis
0011
46.2 Abnormal
temperature of
servo motor 2
SD *1 *1 *1 Each axis Each
axis
46.3 Thermistor
disconnected
error
SD *1 *1 *1 Each axis Each
axis
46.4 Thermistor
circuit error
SD *1 *1 *1 Each axis Each
axis
46.5 Abnormal
temperature of
servo motor 3
DB *1 *1 *1 Each axis Each
axis
46.6 Abnormal
temperature of
servo motor 4
DB *1 *1 *1 Each axis Each
axis
47 Cooling fan
error
47.1 Cooling fan stop
error
SD  CommonAll axes0011
47.2 Cooling fan
speed reduction
error
SD  Common All axes
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)

16 1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list
50 Overload 1 50.1 Thermal
overload error 1
during operation
SD *1 *1 *1 Each axis Each
axis
0011
50.2 Thermal
overload error 2
during operation
SD *1 *1 *1 Each axis Each
axis
50.3 Thermal
overload error 4
during operation
SD *1 *1 *1 Each axis Each
axis
50.4 Thermal
overload error 1
during a stop
SD *1 *1 *1 Each axis Each
axis
50.5 Thermal
overload error 2
during a stop
SD *1 *1 *1 Each axis Each
axis
50.6 Thermal
overload error 4
during a stop
SD *1 *1 *1 Each axis Each
axis
51 Overload 2 51.1 Thermal
overload error 3
during operation
DB *1 *1 *1 Each axis Each
axis
0011
51.2 Thermal
overload error 3
during a stop
DB *1 *1 *1 Each axis Each
axis
52 Error
excessive
52.1 Excess droop
pulse 1
SD  Each axis Each
axis
0101
52.3 Excess droop
pulse 2
SD  Each axis Each
axis
52.4 Error excessive
during 0 torque
limit
SD  Each axis Each
axis
52.5 Excess droop
pulse 3
EDB  Each axis Each
axis
52.6 Excess droop
pulse during
servo-off
SD  Each axis Each
axis
54 Oscillation
detection
54.1 Oscillation
detection error
EDB  Each axis Each
axis
0011
56 Forced stop
error
56.2 Over speed
during forced
stop
EDB  Each axis Each
axis
0110
56.3 Estimated
distance over
during forced
stop
EDB  Each axis Each
axis
56.4 Forced stop
start error
EDB  Each axis Each
axis
61 Operation error 61.1 Point table
setting range
error
DB    0101
63 STO timing
error
63.1 STO1 off DB  CommonAll axes0110
63.2 STO2 off DB  Common All axes
63.5 STO by
functional safety
unit
DB   
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)

1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list 17
1
64 Functional
safety unit
setting error
64.1 STO input error DB    1000
64.2 Compatibility
mode setting
error
DB   
64.3 Operation mode
setting error
DB   
65 Functional
safety unit
connection
error
65.1 Functional
safety unit
communication
error 1
SD    0000
65.2 Functional
safety unit
communication
error 2
SD   
65.3 Functional
safety unit
communication
error 3
SD   
65.4 Functional
safety unit
communication
error 4
SD   
65.5 Functional
safety unit
communication
error 5
SD   
65.6 Functional
safety unit
communication
error 6
SD   
65.7 Functional
safety unit
communication
error 7
SD   
65.8 Functional
safety unit shut-
off signal error 1
DB   
65.9 Functional
safety unit shut-
off signal error 2
DB   
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)

18 1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.2 Alarm list
66 Encoder initial
communication
error (safety
observation
function)
66.1 Encoder initial
communication
- Receive data
error 1 (safety
observation
function)
DB    0110
66.2 Encoder initial
communication
- Receive data
error 2 (safety
observation
function)
DB   
66.3 Encoder initial
communication
- Receive data
error 3 (safety
observation
function)
DB   
66.7 Encoder initial
communication
- Transmission
data error 1
(safety
observation
function)
DB   
66.9 Encoder initial
communication
- Process error
1 (safety
observation
function)
DB   
67 Encoder
normal
communication
error 1 (safety
observation
function)
67.1 Encoder normal
communication
- Receive data
error 1 (safety
observation
function)
DB    0110
67.2 Encoder normal
communication
- Receive data
error 2 (safety
observation
function)
DB   
67.3 Encoder normal
communication
- Receive data
error 3 (safety
observation
function)
DB   
67.4 Encoder normal
communication
- Receive data
error 4 (safety
observation
function)
DB   
67.7 Encoder normal
communication
- Transmission
data error 1
(safety
observation
function)
DB   
68 STO diagnosis
error
68.1 Mismatched
STO signal error
DB  CommonCommon0000
Alarm Detail Stop
method
*2*3
Alarm deactivation Process
ing
system
*9
Stop
system
*9
Alarm code *8
No. Name No. Name Alarm
reset
CPU
reset
Cycling
the
power
ACD3
(Bit 3)
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)