Mitsubishi Electric MELSERVO-J4 series User manual

SH (NA) 030109-D (1308) MEE Printed in Japan Specifications are subject to change without notice.
This Instruction Manual uses recycled paper.
MODEL
MODEL
CODE
General-Purpose AC Servo
MELSERVO-J4 Servo amplifier INSTRUCTION MANUAL TROUBLE SHOOTING
HEAD OFFICE : TOKYO BLDG MARUNOUCHI TOKYO 100-8310
MELSERVO-J4 Servo amplifier
INSTRUCTION MANUAL TROUBLE SHOOTING
1CW808
MR-J4 INSTRUCTIONMANUAL
(TROUBLESHOOTING)
D
D

A - 1
Safety Instructions
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".
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 medium or slight injury to personnel or may cause physical
damage.
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.
Indicates what must not be done. For example, "No Fire" is indicated by .
Indicates what must be done. For example, grounding is indicated by .
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.

A - 2
1. To prevent electric shock, note the following
WARNING
Before wiring or inspection, turn off the power and wait for 15 minutes or more until the charge lamp
turns off. Then, confirm that the voltage between P+ and N- is safe with a voltage tester and others.
Otherwise, an electric shock may occur. In addition, when confirming whether the charge lamp is off or
not, always confirm it from the front of the servo amplifier.
Do not operate switches with wet hands. Otherwise, it may cause an electric shock.
2. To prevent fire, note the following
CAUTION
When you use a MR-J4 multi-axis servo amplifier, connecting an encoder for different axis to the CN2A,
CN2B, or CN2C connector may cause a fire.
3. To prevent injury, note the following
CAUTION
The servo amplifier heat sink, regenerative resistor, servo motor, etc. may be hot while power is on or for
some time after power-off. Take safety measures, e.g. provide covers, to prevent accidental contact of
hands and parts (cables, etc.) with them.
4. Additional instructions
The following instructions should also be fully noted. Incorrect handling may cause a malfunction, injury,
electric shock, etc.
(1) Wiring
CAUTION
Wire the equipment correctly and securely. Otherwise, the servo motor may operate unexpectedly.
To avoid a malfunction, connect the wires to the correct phase terminals (U, V, and W) of the servo
amplifier and servo motor.
Connect the servo amplifier power output (U, V, and W) to the servo motor power input (U, V, and W)
directly. Do not let a magnetic contactor, etc. intervene. Otherwise, it may cause a malfunction.
U
Servo motor
M
V
W
U
V
W
U
M
V
W
U
V
W
Servo amplifier Servo motorServo amplifier

A - 3
(2) Usage
CAUTION
Before resetting an alarm, make sure that the run signal of the servo amplifier is off in order to prevent a
sudden restart. Otherwise, it may cause an accident.
Use the servo amplifier with the specified servo motor.
(3) Corrective actions
CAUTION
When it is assumed that a hazardous condition may occur due to a power failure or product malfunction,
use a servo motor with an electromagnetic brake or external brake to prevent the condition.
Configure an electromagnetic brake circuit so that it is activated also by an external EMG stop switch.
Servo motor
Electromagnetic brake
B
RA
Contacts must be opened
with the EMG stop switch.
Contacts must be opened when CALM (Common
malfunction) or MBR (Electromagnetic brake
interlock) turns off.
24 V DC
When any alarm has occurred, eliminate its cause, ensure safety, and deactivate the alarm before
restarting operation.
Provide an adequate protection to prevent unexpected restart after an instantaneous power failure.
«About the manual»
This Instruction Manual covers the following models.
MR-J4-_A/MR-J4-_A4/MR-J4-_A-RJ/MR-J4-_A4-RJ
MR-J4-_B/MR-J4-_B4/MR-J4-_B-RJ/MR-J4-_B4-RJ
MR-J4W_-_B
MR-J4-_B-RJ010 + MR-J3-T10
The symbols in the target column mean as follows.
MR-J4-_A/MR-J4-_A4/MR-J4-_A-RJ/MR-J4-_A4-RJ: [A]
MR-J4-_B/MR-J4-_B4/MR-J4-_B-RJ/MR-J4-_B4-RJ: [B]
MR-J4W_-_B: [WB]
MR-J4-_B-RJ010 + MR-J3-T10: [RJ010]

A - 4
MEMO

1
CONTENTS
1. TROUBLESHOOTING 1- 1 to 1-72
1.1 Alarm and warning list ...................................................................................................................... 1- 1
1.2 Remedies for alarms......................................................................................................................... 1- 6
1.3 Remedies for warnings .................................................................................................................... 1-54
1.4 Trouble which does not trigger alarm/warning ................................................................................ 1-63
2. DRIVE RECORDER 2- 1 to 2-10
2.1 How to use drive recorder................................................................................................................. 2- 1
2.2 How to display drive recorder information ........................................................................................ 2- 9
APPENDIX App.- 1 to App.- 1
App. 1 Detection points of [AL. 25], [AL. 92], and [AL. 9F]...............................................................App.- 1

2
MEMO

1. TROUBLESHOOTING
1 - 1
1. TROUBLESHOOTING
1.1 Alarm and warning list
When an error occurs during operation, the corresponding alarm or warning is displayed. If any alarm or
warning has occurred, refer to section 1.2 and take the appropriate action. When an alarm occurs, ALM
(Malfunction) will turn off.
No. Name Detail No. Detail name
10 Undervoltage 10.1 Voltage drop in the control circuit power
10.2 Voltage drop in the main circuit power
11 Switch setting error 11.1 Axis number setting error
11.2 Disabling control axis setting error
12 Memory error 1 (RAM) 12.1 RAM error 1
Alarm
12.2 RAM error 2
12.3 RAM error 3
12.4 RAM error 4
12.5 RAM error 5
13 Clock error 13.1 Clock error 1
13.2 Clock error 2
14 Control process error 14.1 Control process error 1
14.2 Control process error 2
14.3 Control process error 3
14.4 Control process error 4
14.5 Control process error 5
14.6 Control process error 6
14.7 Control process error 7
14.8 Control process error 8
14.9 Control process error 9
14.A Control process error 10
15 Memory error 2 (EEP-ROM) 15.1 EEP-ROM error at power on
15.2 EEP-ROM error during operation
16 16.1 Encoder initial communication - Receive data error 1
Encoder initial communication
error 1 16.2 Encoder initial communication - Receive data error 2
16.3 Encoder initial communication - Receive data error 3
16.5 Encoder initial communication - Transmission data error 1
16.6 Encoder initial communication - Transmission data error 2
16.7 Encoder initial communication - Transmission data error 3
16.A Encoder initial communication - Process error 1
16.B Encoder initial communication - Process error 2
16.C Encoder initial communication - Process error 3
16.D Encoder initial communication - Process error 4
16.E Encoder initial communication - Process error 5
16.F Encoder initial communication - Process error 6
17 Board error 17.1 Board error 1
17.3 Board error 2
17.4 Board error 3
17.5 Board error 4
17.6 Board error 5
17.8 Board error 6 (Note)
19 Memory error 3 (Flash-ROM) 19.1 Flash-ROM error 1
19.2 Flash-ROM error 2
1A Servo motor combination error 1A.1 Servo motor combination error
1A.2 Servo motor control mode combination error
1E 1E.1 Encoder malfunction
Encoder initial communication
error 2 1E.2 Load-side encoder malfunction

1. TROUBLESHOOTING
1 - 2
No. Name Detail No. Detail name
1F 1F.1 Incompatible encoder
Encoder initial communication
error 3 1F.2 Incompatible load-side encoder
Alarm
20 20.1 Encoder normal communication - Receive data error 1
Encoder normal communication
error 1 20.2 Encoder normal communication - Receive data error 2
20.3 Encoder normal communication - Receive data error 3
20.5 Encoder normal communication - Transmission data error 1
20.6 Encoder normal communication - Transmission data error 2
20.7 Encoder normal communication - Transmission data error 3
20.9 Encoder normal communication - Receive data error 4
20.A Encoder normal communication - Receive data error 5
21 21.1 Encoder data error 1
Encoder normal communication
error 2 21.2 Encoder data update error
21.3 Encoder data waveform error
21.4 Encoder non-signal error
21.5 Encoder hardware error 1
21.6 Encoder hardware error 2
21.9 Encoder data error 2
24 Main circuit error 24.1 Ground fault detected by hardware detection circuit
24.2 Ground fault detected by software detection function
25.1 Servo motor encoder - Absolute position erased
25 Absolute position erased
25.2 Scale measurement encoder - Absolute position erased
27 27.1 Magnetic pole detection - Abnormal termination
Initial magnetic pole detection
error 27.2 Magnetic pole detection - Time out error
27.3 Magnetic pole detection - Limit switch error
27.4 Magnetic pole detection - Estimated error
27.5 Magnetic pole detection - Position deviation error
27.6 Magnetic pole detection - Speed deviation error
27.7 Magnetic pole detection - Current error
28 Linear encoder error 2 28.1 Linear encoder - Environment error
2A Linear encoder error 1 2A.1 Linear encoder error 1-1
2A.2 Linear encoder error 1-2
2A.3 Linear encoder error 1-3
2A.4 Linear encoder error 1-4
2A.5 Linear encoder error 1-5
2A.6 Linear encoder error 1-6
2A.7 Linear encoder error 1-7
2A.8 Linear encoder error 1-8
2B Encoder counter error 2B.1 Encoder counter error 1
2B.2 Encoder counter error 2
30 Regenerative error 30.1 Regeneration heat error
30.2 Regeneration signal error
30.3 Regeneration feedback signal error
31 Overspeed 31.1 Abnormal motor speed
32 Overcurrent 32.1 Overcurrent detected at hardware detection circuit (during operation)
32.2 Overcurrent detected at software detection function (during operation)
32.3 Overcurrent detected at hardware detection circuit (during a stop)
32.4 Overcurrent detected at software detection function (during a stop)
33 Overvoltage 33.1 Main circuit voltage error
34 SSCNET receive error 1 34.1 SSCNET receive data error
34.2 SSCNET connector connection error
34.3 SSCNET communication data error
34.4 Hardware error signal detection
35 Command frequency error 35.1 Command frequency error
36 SSCNET receive error 2 36.1 Continuous communication data error
37 Parameter error 37.1 Parameter setting range error
37.2 Parameter combination error

1. TROUBLESHOOTING
1 - 3
No. Name Detail No. Detail name
3A Inrush current suppression circuit
error
3A.1 Inrush current suppression circuit error
3D.1 Parameter combination error for driver communication on slave3D Parameter setting error for driver
communication 3D.2 Parameter combination error for driver communication on master
Alarm
3E Operation mode error 3E.1 Operation mode error
42 Servo control error 42.1 Servo control error by position deviation
42.2 Servo control error by speed deviation
42.3 Servo control error by torque/thrust deviation
Fully closed loop control error 42.8 Fully closed loop control error by position deviation
42.9 Fully closed loop control error by speed deviation
42.A Fully closed loop control error by position deviation (during command
stop)
45 Main circuit device overheat 45.1 Main circuit device overheat error
46 Servo motor overheat 46.1 Abnormal temperature of servo motor 1
46.2 Abnormal temperature of servo motor 2
46.3 Thermistor disconnected error
46.5 Abnormal temperature of servo motor 3
46.6 Abnormal temperature of servo motor 4
47 Cooling fan error 47.1 Cooling fan stop error
47.2 Cooling fan speed reduction error
50 Overload 1 50.1 Thermal overload error 1 during operation
50.2 Thermal overload error 2 during operation
50.3 Thermal overload error 4 during operation
50.4 Thermal overload error 1 during a stop
50.5 Thermal overload error 2 during a stop
50.6 Thermal overload error 4 during a stop
51 Overload 2 51.1 Thermal overload error 3 during operation
51.2 Thermal overload error 3 during a stop
52 Error excessive 52.1 Excess droop pulse 1
52.3 Excess droop pulse 2
52.4 Error excessive during 0 torque limit
52.5 Excess droop pulse 3
54 Oscillation detection 54.1 Oscillation detection error
56 Forced stop error 56.2 Over speed during forced stop
56.3 Estimated distance over during forced stop
63 STO timing error 63.1 STO1 off
63.2 STO2 off
70 70.1 Load-side encoder initial communication - Receive data error 1
Load-side encoder initial
communication error 1 70.2 Load-side encoder initial communication - Receive data error 2
70.3 Load-side encoder initial communication - Receive data error 3
70.5 Load-side encoder initial communication - Transmission data error 1
70.6 Load-side encoder initial communication - Transmission data error 2
70.7 Load-side encoder initial communication - Transmission data error 3
70.A Load-side encoder initial communication - Process error 1
70.B Load-side encoder initial communication - Process error 2
70.C Load-side encoder initial communication - Process error 3
70.D Load-side encoder initial communication - Process error 4
70.E Load-side encoder initial communication - Process error 5
70.F Load-side encoder initial communication - Process error 6

1. TROUBLESHOOTING
1 - 4
No. Name Detail No. Detail name
71 71.1 Load-side encoder communication - Receive data error 1
Load-side encoder normal
communication error 1 71.2 Load-side encoder communication - Receive data error 2
Alarm
71.3 Load-side encoder communication - Receive data error 3
71.5 Load-side encoder communication - Transmission data error 1
71.6 Load-side encoder communication - Transmission data error 2
71.7 Load-side encoder communication - Transmission data error 3
71.9 Load-side encoder communication - Transmission data error 4
71.A Load-side encoder communication - Transmission data error 5
72 72.1 Load-side encoder data error 1
Load-side encoder normal
communication error 2 72.2 Load-side encoder data update error
72.3 Load-side encoder data waveform error
72.4 Load-side encoder non-signal error
72.5 Load-side encoder hardware error 1
72.6 Load-side encoder hardware error 2
72.9 Load-side encoder data error 2
74 Option card error 1 74.1 Option card error 1
74.2 Option card error 2
74.3 Option card error 3
74.4 Option card error 4
74.5 Option card error 5
75 Option card error 2 75.3 Option card connection error
75.4 Option card disconnected
82 Master-slave operation error 1 82.1 Master-slave operation error 1
8A USB communication time-out
error/Serial communication time-
out error
8A.1 USB communication time-out error/Serial communication time-out error
8D CC-Link IE communication error 8D.1 CC-Link IE communication error 1
8D.2 CC-Link IE communication error 2
8D.3 Master station setting error 1
8D.5 Master station setting error 2
8D.6 CC-Link IE communication error 3
8D.7 CC-Link IE communication error 4
8D.8 CC-Link IE communication error 5
8D.9 Synchronization error 1
8D.A Synchronization error 2
8E 8E.1 USB communication receive error/Serial communication receive error
USB communication error/Serial
communication error 8E.2 USB communication checksum error/Serial communication checksum
error
8E.3 USB communication character error/Serial communication character
error
8E.4 USB communication command error/Serial communication command
error
8E.5 USB communication data number error/Serial communication data
number error
888/
88888
Watchdog 88._/
8888._
Watchdog
Note. This alarm will occur only in the J3 compatibility mode.

1. TROUBLESHOOTING
1 - 5
No. Name Detail No. Detail name
91 Servo amplifier overheat warning 91.1 Main circuit device overheat warning
92 92.1 Encoder battery cable disconnection warning
Battery cable disconnection
warning 92.3 Battery degradation
93 ABS data transfer warning 93.1 ABS data transfer requirement warning during magnetic pole detection
Warning
95 STO warning 95.1 STO1 off detection
95.2 STO2 off detection
96 Home position setting warning 96.1 In-position warning at home positioning
96.2 Command input warning at home positioning
96.3 Servo off warning at home positioning
96.4 Home positioning warning during magnetic pole detection
99 Stroke limit warning 99.1 Forward rotation stroke end off
99.2 Reverse rotation stroke end off
9D CC-Link IE warning 1 9D.1 Station number switch change warning
9D.2 Master station setting warning
9D.3 Overlapping station number warning
9D.4 Mismatched station number warning
9E CC-Link IE warning 2 9E.1 CC-Link IE communication warning
9F Battery warning 9F.1 Low battery
9F.2 Battery degradation warning
E0 Excessive regeneration warning E0.1 Excessive regeneration warning
E1 Overload warning 1 E1.1 Thermal overload warning 1 during operation
E1.2 Thermal overload warning 2 during operation
E1.3 Thermal overload warning 3 during operation
E1.4 Thermal overload warning 4 during operation
E1.5 Thermal overload warning 1 during a stop
E1.6 Thermal overload warning 2 during a stop
E1.7 Thermal overload warning 3 during a stop
E1.8 Thermal overload warning 4 during a stop
E2 Servo motor overheat warning E2.1 Servo motor temperature warning
E3 Absolute position counter warning E3.1 Multi-revolution counter travel distance excess warning
E3.2 Absolute position counter warning
E3.5 Encoder absolute positioning counter warning
E4 Parameter warning E4.1 Parameter setting range error warning
E5 ABS time-out warning E5.1 Time-out during ABS data transfer
E5.2 ABSM off during ABS data transfer
E5.3 SON off during ABS data transfer
E6 Servo forced stop warning E6.1 Forced stop warning
E7 Controller forced stop warning E7.1 Controller forced stop warning
E8 E8.1 Decreased cooling fan speed warning
Cooling fan speed reduction
warning E8.2 Cooling fan stop
E9 Main circuit off warning E9.1 Servo-on signal on during main circuit off
E9.2 Bus voltage drop during low speed operation
E9.3 Ready-on signal on during main circuit off
EA ABS servo-on warning EA.1 ABS servo-on warning
EB The other axis error warning EB.1 The other axis error warning
EC Overload warning 2 EC.1 Overload warning 2
ED Output watt excess warning ED.1 Output watt excess warning
F0 Tough drive warning F0.1 Instantaneous power failure tough drive warning
F0.3 Vibration tough drive warning
F2 Drive recorder - Miswriting warning F2.1 Drive recorder - Area writing time-out warning
F2.2 Drive recorder - Data miswriting warning
F3 Oscillation detection warning F3.1 Oscillation detection warning

1. TROUBLESHOOTING
1 - 6
1.2 Remedies for alarms
CAUTION
When any alarm has occurred, eliminate its cause, ensure safety, and deactivate
the alarm before restarting operation. Otherwise, it may cause injury.
If [AL. 25 Absolute position erased] occurs, always make home position setting
again. Otherwise, it may cause an unexpected operation.
As soon as an alarm occurs, make the Servo-off status and interrupt the main
circuit power.
POINT
When any of the following alarms has occurred, do not cycle the power
repeatedly to restart. Doing so will cause a malfunction of the servo amplifier
and the servo motor. Remove its cause and allow about 30 minutes for cooling
before resuming the operation.
[AL. 30 Regenerative error] [AL. 45 Main circuit device overheat]
[AL. 46 Servo motor overheat] [AL. 50 Overload 1]
[AL. 51 Overload 2]
Remove the cause of the alarm in accordance with this section. Use MR Configurator2 to refer to a factor of
alarm occurrence.

1. TROUBLESHOOTING
1 - 7
Alarm No.: 10 Name: Undervoltage
Alarm content The voltage of the control circuit power supply has dropped.
The voltage of the main circuit power supply has dropped.
Detail
No. Detail name Cause Check method Check result Action Target
10.1 (1) It has a failure. Connect it correctly.
Voltage drop in
the control
circuit power
The connection of the
control circuit power
supply connector
(CNP2) has a failure.
Check the control
circuit power supply
connector. It has no failure. Check (2).
[A]
[B]
[WB]
[RJ010]
(2) The voltage of the
control circuit power
supply is low.
The voltage is the
prescribed value or
lower.
Review the voltage of
the control circuit
power supply.
Check if the voltage of
the control circuit
power supply is lower
than prescribed value.
200 V amplifier:
160 V AC or less
400 V amplifier:
280 V AC or less
The voltage is higher
than the prescribed
value.
Check (3).
(3) The power was cycled
before the internal
control circuit power
supply stopped.
Check the power-on
method if it has a
problem.
It has a problem. Cycle the power after
the seven-segment
LED of the servo
amplifier is turned off.
It does not have a
problem.
Check (4).
(4) An instantaneous power
failure has occurred for
longer time than the
specified time. The time
will be 60 ms when [Pr.
PA20] is "_ 0 _ _". The
time will be the value
set in [Pr. PF25] when
[Pr. PA20] is "_ 1 _ _".
Check if the power
has a problem.
It has a problem. Review the power.
10.2 (1) It is disconnected. Connect it correctly.
Voltage drop in
the main circuit
power
The main circuit power
supply connector
(CNP1) was
disconnected.
Check the main circuit
power supply
connector. It is connected. Check (2).
(2) The voltage of the main
circuit power supply is
low.
The voltage is the
prescribed value or
lower.
Increase the voltage
of the main circuit
power supply.
Check if the voltage
of the main circuit
power supply is the
prescribed value or
lower.
200 V amplifier:
160 V AC or less
400 V amplifier:
280 V AC or less
The voltage is higher
than the prescribed
value.
Check (3).
(3) The alarm has occurred
during acceleration.
The voltage is lower
than the prescribed
value.
Increase the
acceleration time
constant. Or increase
the power supply
capacity.
Check that the bus
voltage during
acceleration is the
prescribed value or
more.
200 V amplifier:
200 V DC or less
400 V amplifier:
380 V DC or less
The voltage is the
prescribed value or
higher.
Check (4).
(4) The servo amplifier is
malfunctioning.
Check the bus voltage
value.
The voltage of the
main circuit power
supply is 160 V AC
or more, and the bus
voltage is less than
200 V DC.
200 V amplifier:
200 V DC or less
400 V amplifier:
380 V DC or less
Replace the servo
amplifier.

1. TROUBLESHOOTING
1 - 8
Alarm No.: 11 Name: Switch setting error
Alarm content The setting of the axis selection rotary switch or auxiliary axis number setting switch is incorrect.
The setting of the disabling control axis switch is incorrect.
Detail
No. Detail name Cause Check method Check result Action Target
11.1 Axis number
setting error
(1) The setting of the Axis
No. is incorrect.
Check the settings of
the auxiliary axis
number setting switch
(SW2-5 and SW2-6)
and axis selection
rotary switch (SW1).
When both of the
auxiliary axis number
setting switches are
on, check the axis
selection rotary switch
if "F" is selected for
MR-J4W2, ("E" or "F"
is selected for MR-
J4W2).
Set the axis No.
correctly.
[WB]
Both of the auxiliary
axis number setting
switches are off.
Replace the servo
amplifier.
11.2 Disabling
control axis
setting error
(1) The setting of the
disabling control axis
switch is incorrect.
Check the setting of
the disabling control
axis switch.
Check if the setting
is as follows.
1) Only A-axis is
disabled.
2) Only B-axis is
disabled.
3) A-axis and B-axis
are disabled.
4) A-axis and C-axis
are disabled.
5) All axes are set
disabled.
Set it correctly.
The setting is other
than above.
Replace the servo
amplifier.
Alarm No.: 12 Name: Memory error 1 (RAM)
Alarm content A part (RAM) in the servo amplifier is failure.
Detail
No. Detail name Cause Check method Check result Action Target
12.1 RAM error 1 (1) A part in the servo
amplifier is failure.
It is repeatable. Replace the servo
amplifier.
Disconnect the cables
except the control
circuit power supply,
and then check the
repeatability.
It is not repeatable. Check (2).
[A]
[B]
[WB]
[RJ010]
(2) Something near the
device caused it.
Check the power
supply for noise.
It has a failure. Take
countermeasures
against its cause.
12.2 RAM error 2 Check it with the check method for [AL. 12.1].
12.3 RAM error 3
12.4 RAM error 4
12.5 RAM error 5

1. TROUBLESHOOTING
1 - 9
Alarm No.: 13 Name: Clock error
Alarm content
[RJ010]: MR-J3-T10 came off.
A part in the servo amplifier is failure.
A clock error transmitted from the controller occurred.
Detail
No. Detail name Cause Check method Check result Action Target
13.1 Clock error 1 (1) The MR-J3-T10 came
off during the CC-Link
IE communication.
It occurred. Check it with the
check method for [AL.
74].
[RJ010]
Check if [AL. 74
Option card error 1]
occurred with alarm
history. It did not occur. Check (2).
(2) A part in the servo
amplifier is failure.
It is repeatable. Replace the servo
amplifier.
[A]
[B]
[WB]
[RJ010]
Disconnect the cables
except the control
circuit power supply,
and then check the
repeatability. It is not repeatable. Check (3).
(3) It occurs. Replace the
controller.
[B]
[WB]
A clock error transmitted
from the controller
occurred.
Check if the error
occurs when you
connect the amplifier
to the controller.
It does not occur. Check (4).
(4) The servo amplifier of
the next axis is
malfunctioning.
Check if the servo
amplifier of the next
axis is malfunctioning.
It is malfunctioning. Replace the servo
amplifier of the next
axis.
It is not
malfunctioning.
Check (5).
(5) Something near the
device caused it.
Check the power
supply for noise.
Check if the connector
is shorted.
It has a failure. Take
countermeasures
against its cause.
[A]
[B]
[WB]
[RJ010]
13.2 Clock error 2 Check it with the check method for [AL. 13.1].
Alarm No.: 14 Name: Control process error
Alarm content [RJ010]: MR-J3-T10 came off.
The process did not complete within the specified time.
Detail
No. Detail name Cause Check method Check result Action Target
14.1 Control process
error 1
(1) The MR-J3-T10 came
off during the CC-Link
IE communication.
It occurred. Check it with the
check method for [AL.
74].
[RJ010]
Check if [AL. 74
Option card error 1]
occurred with alarm
history. It did not occur. Check (2).
(2) It is incorrect. Set it correctly.
The parameter setting is
incorrect.
Check if the parameter
setting is incorrect. It is correct. Check (3).
(3) Something near the
device caused it.
It has a failure. Take
countermeasures
against its cause.
[A]
[B]
[WB]
[RJ010]
Check the power
supply for noise.
Check if the connector
is shorted. It has no failure. Check (4).
(4) The servo amplifier is
malfunctioning.
Replace the servo
amplifier, and then
check the
repeatability.
It is not repeatable. Replace the servo
amplifier.

1. TROUBLESHOOTING
1 - 10
Alarm No.: 14 Name: Control process error
Alarm content [RJ010]: MR-J3-T10 came off.
The process did not complete within the specified time.
Detail
No. Detail name Cause Check method Check result Action Target
14.2 Control process
error 2
(1) The MR-J3-T10 came
off during the CC-Link
IE communication.
It occurred. Check it with the
check method for [AL.
74].
[RJ010]
Check if [AL. 74
Option card error 1]
occurred with alarm
history. It did not occur. Check (2).
(2) It is repeatable. Replace the servo
amplifier.
[B]
[WB]
A synchronous signal
error transmitted from
the controller occurred.
Replace the controller,
and then check the
repeatability. It is not repeatable. Check (3).
(3) It has been executed
for multiple axes
simultaneously.
Execute it for each
axis.
[WB]
Adaptive tuning mode
([Pr. PB01]) or vibration
suppression control
tuning mode ([Pr.
PB02]) has been
executed for multiple
axes simultaneously.
Check the setting of
[Pr. PB01] or [Pr.
PB02].
It has not been
executed for multiple
axes simultaneously.
Check (4).
(4) It is incorrect. Set it correctly.
The parameter setting is
incorrect.
Check if the parameter
setting is incorrect. It is correct. Check (5).
(5) Something near the
device caused it.
It has a failure. Take
countermeasures
against its cause.
[A]
[B]
[WB]
[RJ010]
Check the power
supply for noise.
Check if the connector
is shorted. It has no failure. Check (6).
(6) The servo amplifier is
malfunctioning.
Replace the servo
amplifier, and then
check the
repeatability.
It is not repeatable. Replace the servo
amplifier.
Alarm No.: 14 Name: Control process error
Alarm content The process did not complete within the specified time.
Detail
No. Detail name Cause Check method Check result Action Target
14.3 Control process
error 3
Check it with the check method for [AL. 14.1].
14.4 Control process
error 4
14.5 Control process
error 5
14.6 Control process
error 6
14.7 Control process
error 7
14.8 Control process
error 8
14.9 Control process
error 9
14.A Control process
error 10

1. TROUBLESHOOTING
1 - 11
Alarm No.: 15 Name: Memory error 2 (EEP-ROM)
Alarm content [RJ010]: MR-J3-T10 came off.
A part (EEP-ROM) in the servo amplifier is failure.
Detail
No. Detail name Cause Check method Check result Action Target
15.1 EEP-ROM error
at power on
(1) It is repeatable. Replace the servo
amplifier.
EEP-ROM is
malfunctioning at power
on.
Disconnect the cables
except the control
circuit power supply,
and then check the
repeatability.
It is not repeatable. Check (2).
[A]
[B]
[WB]
[RJ010]
(2) Something near the
device caused it.
It has a failure. Take
countermeasures
against its cause.
Check the power
supply for noise.
Check if the connector
is shorted. It has no failure. Check (3).
(3) The number of write
times exceeded
100,000.
Check if parameters
has been used very
frequently.
It has a failure. Replace the servo
amplifier. Change the
process to use
parameters less
frequently after
replacement.
15.2 EEP-ROM error
during operation
(1) The MR-J3-T10 came
off during the CC-Link
IE communication.
It occurred. Check it with the
check method for [AL.
74].
[RJ010]
Check if [AL. 74
Option card error 1]
occurred with alarm
history. It did not occur. Check (2).
(2) It occurs. Replace the servo
amplifier.
EEP-ROM is
malfunctioning during
normal operation.
Check if the error
occurs when you
change parameters
during normal
operation.
It does not occur. Check (3).
(3) It takes an hour or
more.
Replace the servo
amplifier.
[A]
[B]
[WB]
[RJ010]
A write error occurred
while tuning results was
processed.
Check if the alarm
occurs after an hour
from power on. It takes less than an
hour.
Check (4).
(4) Something near the
device caused it.
Check the power
supply for noise.
Check if the connector
is shorted.
It has a failure. Take
countermeasures
against its cause.

1. TROUBLESHOOTING
1 - 12
Alarm No.: 16 Name: Encoder initial communication error 1
Alarm content Communication error occurred between encoder and servo amplifier.
Detail
No. Detail name Cause Check method Check result Action Target
16.1 (1) An encoder cable is
malfunctioning.
It has a failure. Replace or repair the
cable.
Encoder initial
communication
- Receive data
error 1
Check if the encoder
cable is disconnected
or shorted. It has no failure. Check (2).
[A]
[B]
[WB]
[RJ010]
(2) The servo amplifier
is not compatible
with it.
Use a servo amplifier
which is compatible
with it.
[A]
[B]
When you use a linear
servo motor with an
A/B/Z-phase differential
output linear encoder,
the servo amplifier is
not compatible with the
linear encoder.
Check if the servo
amplifier (MR-J4-
_A(4)-RJ or MR-J4-
_B(4)-RJ) is
compatible with the
A/B/Z-phase
differential output
linear encoder.
The servo amplifier
is compatible with it.
Check (3).
(3) The wiring is
incorrect.
Wire it correctly.
When you use a linear
servo motor with an
A/B/Z-phase differential
output linear encoder,
the connection with the
linear encoder is
incorrect.
Check if the wiring of
the linear encoder is
correct. (Check if it is
wired to PSEL.) The wiring is correct. Check (4).
(4) The servo amplifier is
malfunctioning.
It is not repeatable. Replace the servo
amplifier.
Replace the servo
amplifier, and then
check the
repeatability.
It is repeatable. Check (5).
[A]
[B]
[WB]
[RJ010]
(5) It is not repeatable. Replace the servo
motor.
An encoder is
malfunctioning.
Replace the servo
motor or linear
encoder, and then
check the
repeatability.
It is repeatable. Check (6).
(6) Something near the
device caused it.
Check the noise,
ambient temperature,
vibration, etc.
It has a failure. Take
countermeasures
against its cause.
16.2 Encoder initial
communication
- Receive data
error 2
Check it with the check method for [AL. 16.1].

1. TROUBLESHOOTING
1 - 13
Alarm No.: 16 Name: Encoder initial communication error 1
Alarm content Communication error occurred between encoder and servo amplifier.
Detail
No. Detail name Cause Check method Check result Action Target
16.3 (1) It is not set as
disabled-axis.
Set it as disabled-
axis.
[WB]
Encoder initial
communication
- Receive data
error 3
An axis not used is not
set as disabled-axis.
Check the setting of
the disabling control
axis switch (SW2-2,
SW2-3 and SW2-4).
It is set as disabled-
axis.
Check (2).
(2) It is not connected. Connect it correctly.
An encoder cable was
disconnected.
Check if the encoder
cable is connected
correctly. It is connected. Check (3).
(3) The setting is
incorrect.
Set it correctly.
[A]
[B]
[WB]
[RJ010]
The parameter setting
of two-wire type/four-
wire type is incorrect.
[A]: [Pr. PC22]
[B] [WB] [RJ010]:
[Pr. PC04]
Check the parameter
setting.
The setting is correct. Check (4).
(4) It has a failure. Replace or repair the
cable.
An encoder cable is
malfunctioning.
Check if the encoder
cable is disconnected
or shorted. It has no failure. Check (5).
(5) The wiring is
incorrect.
Wire it correctly. [A]
[B]
When you use a linear
servo motor with an
A/B/Z-phase differential
output linear encoder,
the connection with the
linear encoder is
incorrect.
Check if the wiring of
the linear encoder is
correct. (Check if it is
wired to PSEL.) The wiring is correct. Check (6).
(6) The voltage of the
control circuit power
supply has been
unstable.
Check the voltage of
the control circuit
power supply.
The control circuit
power supply has
been an
instantaneous power
failure.
Review the power
and related parts.
[A]
[B]
[WB]
[RJ010]
It has no failure. Check (7).
(7) The servo amplifier is
malfunctioning.
It is not repeatable. Replace the servo
amplifier.
Replace the servo
amplifier, and then
check the
repeatability.
It is repeatable. Check (8).
(8) An encoder is
malfunctioning.
It is not repeatable. Replace the servo
motor.
Replace the servo
motor, and then check
the repeatability. It is repeatable. Check (9).
(9) Something near the
device caused it.
Check the noise,
ambient temperature,
vibration, etc.
It has a failure. Take
countermeasures
against its cause.
16.5 Encoder initial
communication
- Transmission
data error 1
Check it with the check method for [AL. 16.1].
16.6 Encoder initial
communication
- Transmission
data error 2
16.7 Encoder initial
communication
- Transmission
data error 3