Mitsubishi Electric MELSERVO-JE User manual

SH(NA)030166ENG-D(1708)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-JE Servo amplifier INSTRUCTION MANUAL (TROUBLE SHOOTING)
HEAD OFFICE: TOKYO BLDG MARUNOUCHI TOKYO 100-8310
MELSERVO-JE Servo amplifier
INSTRUCTION MANUAL (TROUBLE SHOOTING)
1CW710
MR-JE 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 level lower 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 and inspections, turn off the power and wait for 15 minutes or more until the charge lamp
turns off. Otherwise, an electric shock may occur. In addition, always confirm that the charge lamp is off
from the front of the servo amplifier.
Do not operate switches with wet hands. Doing so may cause an electric shock.
2. To prevent injury, note the following.
CAUTION
The servo amplifier heat sink, regenerative resistor, servo motor, etc. may be hot while the power is on,
or for some time after power-off. Take safety measures, such as providing covers, to avoid accidentally
touching the parts (cables, etc.) by hand.
3. Additional instructions
The following instructions should also be fully noted. Incorrect handling may cause a malfunction, injury,
electric shock, etc.
(1) Wiring
CAUTION
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.
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/W) of the servo amplifier
and servo motor.
Connect the servo amplifier power outputs (U/V/W) to the servo motor power inputs (U/V/W) directly. Do
not connect a magnetic contactor, etc. 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 Servo motorServo amplifier
Configure a circuit to turn off EM2 or EM1 when the power supply is turned off to prevent an unexpected
restart of the servo amplifier.
To prevent malfunction, avoid bundling power lines (input/output) and signal cables together or running
them in parallel to each other. Separate the power lines from the signal cables.

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.
Correctly wire options and peripheral equipment, etc. in the correct combination. Otherwise, an electric
shock, fire, injury, etc. may occur.
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.
(3) Corrective actions
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, machine stoppage, 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.
Servo motor
Electromagnetic brake
B
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
When an alarm occurs, eliminate its cause, ensure safety, and deactivate the alarm before restarting
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 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.
To prevent an electric shock, injury, or fire from occurring after an earthquake or other natural disasters,
ensure safety by checking conditions, such as the installation, mounting, wiring, and equipment before
switching the power on.

A - 4
«About the manual»
This Instruction Manual covers the following models.
MR-JE-_A
MR-JE-_B
MR-JE-_C
The symbols in the target column mean as follows.
[A]: MR-JE-_A
[B]: MR-JE-_B
[C]: MR-JE-_C

1
CONTENTS
1. SERVO AMPLIFIER TROUBLESHOOTING 1- 1 to 1-70
1.1 Explanations of the lists .................................................................................................................... 1- 1
1.2 Alarm list ........................................................................................................................................... 1- 3
1.3 Warning list ....................................................................................................................................... 1- 7
1.4 Remedies for alarms......................................................................................................................... 1- 9
1.5 Remedies for warnings .................................................................................................................... 1-44
1.6 Trouble which does not trigger an alarm/warning ........................................................................... 1-58
2. DRIVE RECORDER 2- 1 to 2- 8
2.1 How to use the drive recorder........................................................................................................... 2- 1
2.2 How to display drive recorder information ........................................................................................ 2- 7
APPENDIX App. - 1 to App. - 1
App. 1 Detection points of [AL. 25], [AL. 92], and [AL. 9F]...............................................................App.- 1

2
MEMO

1. SERVO AMPLIFIER TROUBLESHOOTING
1 - 1
1. SERVO AMPLIFIER TROUBLESHOOTING
POINT
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.
When an error occurs during operation, the corresponding alarm or warning is displayed. If an alarm is
displayed, refer to section 1.4 and take the appropriate action. When an alarm occurs, ALM (Malfunction)
turns off.
If any warning occurs, refer to section 1.5 and take the appropriate action.
1.1 Explanations of the lists
(1) No./Name/Detail No./Detail name
Indicates the No./name/detail No./detail name of alarms or warnings.
(2) 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.
(3) Alarm deactivation
After the cause of the alarm has been removed, the alarm can be deactivated by any of the methods
marked in the alarm deactivation column. Warnings are automatically canceled after the cause of
occurrence is removed. Alarms are deactivated by alarm reset, CPU reset, or power cycling.
(a) MR-JE-_A
Alarm deactivation Explanation
Alarm reset 1. Turn on RES (Reset) with an input device.
2. Push the "SET" button while the display of the servo amplifier is in the current
alarm display mode.
3. Click "Occurring Alarm Reset" in the "Alarm Display" window of MR Configurator2.
Power cycling Turn off the power, check that the 5-digit, 7-segment LED display is off, and then
turn on the power.
(b) MR-JE-_B
Alarm deactivation Explanation
Alarm reset 1. Error reset command from the controller
2. Click "Occurring Alarm Reset" in the "Alarm Display" window of MR Configurator2.
CPU reset Reset the controller itself.
Power cycling Turn off the power, check that the 3-digit, 7-segment LED display is off, and then
turn on the power.
(c) MR-JE-_C
Alarm deactivation Explanation
Alarm reset 1. Turn on RES (Reset) with an input device.
2. Error reset command from the controller
3. Click "Occurring Alarm Reset" in the "Alarm Display" window of MR Configurator2.
Power cycling Turn off the power, check that the 3-digit, 7-segment LED display is off, and then
turn on the power.

1. SERVO AMPLIFIER TROUBLESHOOTING
1 - 2
(4) Alarm code
Alarm codes are outputted from the MR-JE-_A or MR-JE-_C. To output alarm codes, set [Pr. PD34] to "_
_ _ 1" for the MR-JE-_A or set [Pr. PD39] to "_ _ _ 1" for the MR-JE-_C. Warnings ([AL. 90] to [AL. F3])
do not have alarm codes. The alarm codes in the following table are outputted when they occur. The
alarm codes are not outputted in normal condition.

1. SERVO AMPLIFIER TROUBLESHOOTING
1 - 3
1.2 Alarm list
No. Name
Detail
No. Detail name
Stop
method
(Note 2,
3)
Alarm deactivation Alarm code
(Note 5)
Alarm
reset
CPU
reset
Power
cycling
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)
Alarm
10 Undervoltage
10.1 Voltage drop in the power EDB 0 1 0
10.2 Bus voltage drop SD
12.1 RAM error 1 DB
12.2 RAM error 2 DB
12 Memory error 1 (RAM) 12.3 RAM error 3 DB 0 0 0
12.4 RAM error 4 DB
12.5 RAM error 5 DB
12.6 RAM error 6 DB
13.1 Clock error 1 DB
13 Clock error 13.2 Clock error 2 DB 0 0 0
13.3 Clock error 3 DB
14.1 Control process error 1 DB
14.2 Control process error 2 DB
14.3 Control process error 3 DB
14.4 Control process error 4 DB
14.5 Control process error 5 DB
14 Control process error 14.6 Control process error 6 DB 0 0 0
14.7 Control process error 7 DB
14.8 Control process error 8 DB
14.9 Control process error 9 DB
14.A Control process error 10 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
0 0 0
15.2 EEP-ROM error during operation DB
15.4 Home position information read
error DB
16
16.1
Encoder initial communication -
Receive data error 1 DB
16.2 Encoder initial communication -
Receive data error 2 DB
16.3 Encoder initial communication -
Receive data error 3 DB
16.5 Encoder initial communication -
Transmission data error 1 DB
16.6 Encoder initial communication -
Transmission data error 2 DB
Encoder initial
communication error 1
16.7 Encoder initial communication -
Transmission data error 3 DB
1 1 0
16.A Encoder initial communication -
Process error 1 DB
16.B Encoder initial communication -
Process error 2 DB
16.C Encoder initial communication -
Process error 3 DB
16.D Encoder initial communication -
Process error 4 DB
16.E Encoder initial communication -
Process error 5 DB
16.F Encoder initial communication -
Process error 6 DB
17.1 Board error 1 DB
17.3 Board error 2 DB
17 Board error 17.4 Board error 3 DB 0 0 0
17.5 Board error 4 DB
17.6 Board error 5 DB
17.7 Board error 7 DB

1. SERVO AMPLIFIER TROUBLESHOOTING
1 - 4
No. Name
Detail
No. Detail name
Stop
method
(Note 2,
3)
Alarm deactivation Alarm code
(Note 5)
Alarm
reset
CPU
reset
Power
cycling
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)
Alarm
19.1 Flash-ROM error 1 DB
19 Memory error 3
(Flash-ROM)
19.2 Flash-ROM error 2 DB 0 0 0
19.4 Flash-ROM error 4 DB
19.5 Flash-ROM error 5 DB
1A Servo motor
combination error
1A.1 Servo motor combination error 1 DB 1 1 0
1A.4 Servo motor combination error 2 DB
1E Encoder initial
communication error 2 1E.1 Encoder malfunction DB 1 1 0
1F Encoder initial
communication error 3 1F.1 Incompatible encoder DB 1 1 0
20.1 Encoder normal communication -
Receive data error 1 EDB
20.2
Encoder normal communication -
Receive data error 2 EDB
20.3
Encoder normal communication -
Receive data error 3 EDB
20 Encoder normal
communication error 1
20.5 Encoder normal communication -
Transmission data error 1 EDB
1 1 0
20.6 Encoder normal communication -
Transmission data error 2 EDB
20.7 Encoder normal communication -
Transmission data error 3 EDB
20.9 Encoder normal communication -
Receive data error 4 EDB
20.A Encoder normal communication -
Receive data error 5 EDB
21 Encoder normal
communication error 2
21.1 Encoder data error 1 EDB
1 1 0
21.2 Encoder data update error EDB
21.3 Encoder data waveform error EDB
21.5 Encoder hardware error 1 EDB
21.6 Encoder hardware error 2 EDB
21.9 Encoder data error 2 EDB
24 Main circuit error
24.1 Ground fault detected at hardware
detection circuit DB
1 0 0
24.2 Ground fault detected at software
detection function DB
25 Absolute position
erased 25.1 Servo motor encoder - Absolute position erased DB
30.1 Regeneration heat error DB
(Note 1) (Note 1) (Note 1)
30 Regenerative error 30.2 Regeneration signal error DB
(Note 1) (Note 1) (Note 1) 0 0 1
30.3 Regeneration feedback signal
error DB
(Note 1) (Note 1) (Note 1)
31 Overspeed 31.1 Abnormal motor speed SD 1 0 1
32.1 Overcurrent detected at hardware
detection circuit (during operation) DB
32 Overcurrent
32.2
Overcurrent detected at software
detection function (during
operation)
DB
1 0 0
32.3 Overcurrent detected at hardware
detection circuit (during a stop) DB
32.4 Overcurrent detected at software
detection function (during a stop) DB
33 Overvoltage 33.1 Main circuit voltage error EDB 0 0 1
34 SSCNET receive error
1
34.1 SSCNET receive data error SD
(Note 4)
34.2 SSCNET connector connection
error SD
34.3 SSCNET communication data
error SD
34.4 Hardware error signal detection SD
35 Command frequency
error 35.1 Command frequency error SD 1 0 1

1. SERVO AMPLIFIER TROUBLESHOOTING
1 - 5
No. Name
Detail
No. Detail name
Stop
method
(Note 2,
3)
Alarm deactivation Alarm code
(Note 5)
Alarm
reset
CPU
reset
Power
cycling
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)
Alarm
36 SSCNET receive error
2 36.1 Continuous communication data error SD
37.1 Parameter setting range error DB
37 Parameter error 37.2 Parameter combination error DB 0 0 0
37.3 Point table setting error DB
39 Program error
39.1 Program error DB
39.2 Instruction argument external error DB
39.3 Register No. error DB 0 0 0
39.4 Non-correspondence command
error DB
3A
Inrush current
suppression circuit
error
3A.1 Inrush current suppression circuit
error EDB 0 0 0
3E Operation mode error 3E.1 Operation mode error DB
3E.6 Operation mode switch error DB 0 0 0
45 Main circuit device
overheat 45.1 Main circuit device overheat error 1 SD
(Note 1) (Note 1) (Note 1) 0 1 1
46 Servo motor overheat
46.1 Abnormal temperature of servo
motor 1 SD
(Note 1) (Note 1) (Note 1)
0 1 1
46.5
Abnormal temperature of servo
motor 3 DB
(Note 1) (Note 1) (Note 1)
46.6
Abnormal temperature of servo
motor 4 DB
(Note 1) (Note 1) (Note 1)
47 Cooling fan error 47.2 Cooling fan speed reduction error SD 0 1 1
50.1
Thermal overload error 1 during
operation SD
(Note 1) (Note 1) (Note 1)
50.2
Thermal overload error 2 during
operation SD
(Note 1) (Note 1) (Note 1)
50 Overload 1
50.3 Thermal overload error 4 during
operation SD
(Note 1) (Note 1) (Note 1) 0 1 1
50.4 Thermal overload error 1 during a
stop SD
(Note 1) (Note 1) (Note 1)
50.5
Thermal overload error 2 during a
stop SD
(Note 1) (Note 1) (Note 1)
50.6
Thermal overload error 4 during a
stop SD
(Note 1) (Note 1) (Note 1)
51 Overload 2
51.1 Thermal overload error 3 during
operation DB
(Note 1) (Note 1) (Note 1) 0 1 1
51.2 Thermal overload error 3 during a
stop DB
(Note 1) (Note 1) (Note 1)
52.1 Excess droop pulse 1 SD
52 Error excessive
52.3 Excess droop pulse 2 SD
1 0 1
52.4 Error excessive during 0 torque
limit SD
52.5 Excess droop pulse 3 EDB
54 Oscillation detection 54.1 Oscillation detection error EDB 0 1 1
56 Forced stop error
56.2 Over speed during forced stop EDB
1 1 0
56.3 Estimated distance over during
forced stop EDB
61 Operation error 61.1 Point table setting range error DB 1 0 1
69.1 Forward rotation-side software limit
detection - Command excess error SD
69 Command error
69.2 Reverse rotation-side software limit
detection - Command excess error SD
1 0 1
69.3 Forward rotation stroke end
detection - Command excess error SD
69.4 Reverse rotation stroke end
detection - Command excess error SD
86 Network
communication error
86.1 Network communication error 1 SD
86.4 Network communication error 4 SD 0 0 0
86.5 Network communication error 5 SD

1. SERVO AMPLIFIER TROUBLESHOOTING
1 - 6
No. Name
Detail
No. Detail name
Stop
method
(Note 2,
3)
Alarm deactivation Alarm code
(Note 5)
Alarm
reset
CPU
reset
Power
cycling
ACD2
(Bit 2)
ACD1
(Bit 1)
ACD0
(Bit 0)
Alarm
8A
USB communication
time-out error/serial
communication time-
out error/Modbus RTU
communication time-
out error
8A.1
USB communication time-out
error/serial communication time-
out error
SD
0 0 0
8A.2 Modbus RTU communication time-
out error SD
8C.1 Network module communication
error 1 SD
8C.2 Network module communication
error 2 SD
Network module
communication error
8C.3 Network module communication
error 3 SD
8C 8C.4 Network module communication
error 4 SD 0 0 0
8C.5 Network module communication
error 5 SD
8C.6 Network module communication
error 6 SD
8C.7 Network module communication
error 7 SD
8E
USB communication
error/serial
communication
error/Modbus RTU
communication error
8E.1
USB communication receive
error/serial communication receive
error
SD
0 0 0
8E.2
USB communication checksum
error/serial communication
checksum error
SD
8E.3
USB communication character
error/serial communication
character error
SD
8E.4
USB communication command
error/serial communication
command error
SD
8E.5
USB communication data number
error/serial communication data
number error
SD
8E.6 Modbus RTU communication
receive error SD
8E.7 Modbus RTU communication
message frame error SD
8E.8 Modbus RTU communication CRC
error SD
888/
88888 Watchdog 88._/ 8888._ Watchdog DB
Note 1.
A
fter resolving the source of trouble, cool the equipment for approximately 30 minutes.
2. The following shows three stop methods of DB, EDB, and SD.
DB: Dynamic brake stop (For a servo amplifier without the dynamic brake, the servo motor coasts.)
EDB: Electronic dynamic brake stop (available with specified servo motors)
Refer to the following table for the specified servo motors. The stop method for other than the specified
servo motors is DB.
For MR-JE_A, setting [Pr. PF09] to "(_ _ _ 3)" enables the electronic dynamic brake.
Series Servo motor
HG-KN HG-KN053/HG-KN13/HG-KN23/HG-KN43
HG-SN HG-SN52
SD: Forced stop deceleration
3. This is applicable when [Pr. PA04] is set to the initial value. The stop method of SD can be changed to DB using
[Pr. PA04].
4. In some controller communication status, the alarm factor may not be removed.
5.
A
larm codes are outputted from the MR-JE-_A or MR-JE-_C. Refer to section 1.1 for details.

1. SERVO AMPLIFIER TROUBLESHOOTING
1 - 7
1.3 Warning list
No. Name
Detail
No. Detail name
Stop
method
(Note 2,
3)
Warning
90.1 Home position return incomplete
90 Home position return
incomplete warning 90.2 Home position return abnormal termination
90.5 Z-phase unpassed
91
Servo amplifier
overheat warning
(Note 1)
91.1 Main circuit device overheat
warning
92 Battery cable
disconnection warning
92.1 Encoder battery cable
disconnection warning
92.3 Battery degradation
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
97 Positioning
specification warning 97.1 Program operation disabled warning
98 Software limit warning
98.1 Forward rotation-side software
stroke limit reached
98.2
Reverse rotation-side software
stroke limit reached
99 Stroke limit warning 99.1 Forward rotation stroke end off (Note 4)
99.2 Reverse rotation stroke end off (Note 4)
9B Error excessive
warning
9B.1 Excess droop pulse 1 warning
9B.3 Excess droop pulse 2 warning
9B.4
Error excessive warning during 0
torque limit
9F Battery warning 9F.1 Low battery
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
E3 Absolute position
counter warning
E3.1 Multi-revolution counter travel
distance excess warning
E3.2 Absolute position counter warning
E3.4
Absolute positioning counter EEP-
ROM writing frequency warning
E3.5
Encoder absolute positioning
counter warning
E4 Parameter warning E4.1
Parameter setting range error
warning
E6 Servo forced stop
warning E6.1 Forced stop warning SD
E7 Controller forced stop
warning E7.1 Controller forced stop input warning SD
E8 Cooling fan speed
reduction warning E8.1 Decreased cooling fan speed warning

1. SERVO AMPLIFIER TROUBLESHOOTING
1 - 8
No. Name
Detail
No. Detail name
Stop
method
(Note 2,
3)
Warning
E9 Main circuit off warning
E9.1 Servo-on signal on during main
circuit off DB
E9.2 Bus voltage drop during low speed
operation DB
E9.3
Ready-on signal on during main
circuit off DB
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
F4.4
Target position setting range error
warning
F4 Positioning warning
F4.6 Acceleration time constant setting
range error warning
F4.7
Deceleration time constant setting
range error warning
F4.8
Control command input error
warning
F5
Simple cam function -
Cam data miswriting
warning
F5.1 Cam data - Area writing time-out
warning
F5.2 Cam data - Area miswriting warning
F5.3 Cam data checksum error
F6.1
Cam axis one cycle current value
restoration failed
F6 Simple cam function -
Cam control warning
F6.2 Cam axis feed current value
restoration failed
F6.3 Cam unregistered error
F6.4 Cam control data setting range error
F6.5 Cam No. external error
F6.6 Cam control inactive
Note 1.
A
fter resolving the source of trouble, cool the equipment for approximately 30 minutes.
2. The following shows two stop methods of DB and SD.
DB: Dynamic brake stop (For a servo amplifier without the dynamic brake, the servo motor coasts.)
SD: Forced stop deceleration
3. This is applicable when [Pr. PA04] is set to the initial value. The stop method of SD can be changed to DB
using [Pr. PA04].
4. Quick stop or slow stop can be selected using [Pr. PD30] for the MR-JE-_A or using [Pr. PD35] for the MR-
JE-_C (except in the profile mode).

1. SERVO AMPLIFIER TROUBLESHOOTING
1 - 9
1.4 Remedies for alarms
CAUTION
When an alarm occurs, eliminate its cause, ensure safety, and deactivate the
alarm to restart operation. Otherwise, it may cause injury.
If [AL. 25 Absolute position erased] occurs, perform the 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 power.
POINT
When any of the following alarms occurs, do not deactivate the alarm repeatedly
to restart operation. Doing so will cause a malfunction of the servo amplifier and
servo motor. Remove its cause and allow 30 minutes or more for cooling, and
then resume 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]
[AL. 37 Parameter error] is not recorded in the alarm history.
Remove the cause of the alarm in accordance with this section. Use MR Configurator2 to refer to the cause
of alarm occurrence.

1. SERVO AMPLIFIER TROUBLESHOOTING
1 - 10
Alarm No.: 10 Name: Undervoltage
Alarm content
The power supply voltage dropped.
The bus voltage dropped.
The power supply wiring is incorrect.
Detail
No. Detail name Cause Check method Check result Action Target
10.1 Voltage drop in
the power
(1) The connection of the
power connector has a
failure.
Check the power
connector.
It has a failure. Connect it correctly. [A]
[B]
[C]
It has no failure. Check (2).
(2) The power supply
voltage is low.
Check if the power
supply voltage is 160
V AC or less.
The voltage is 160 V
AC or less.
Review the power
supply voltage.
The voltage is
higher than 160 V
AC.
Check (3).
(3) An instantaneous power
failure has occurred for
longer time than the
specified time. The time
is 60 ms when [Pr.
PA20] is "_ 0 _ _". The
time is the value set in
[Pr. PF25] when [Pr.
PA20] is "_ 1 _ _".
Check if the power
supply has a problem.
It has a problem. Review the power
supply.
It has no problem. Check (4).
(4) For the 1-phase power
supply, the power
supply wiring is
incorrect.
Check the power
supply wiring.
MR-JE-100_ or less:
L1 and L3
MR-JE-200_:
L1 and L2
The power supply
wiring is incorrect.
Connect it correctly.
10.2 Bus voltage
drop
(1) The connection of the
power connector has a
failure.
Check the power
connector.
It has a failure. Connect it correctly.
It has no failure. Check (2).
(2) The power supply
voltage is low.
Check if the power
supply voltage is 160
V AC or less.
The voltage is 160 V
AC or less.
Increase the power
supply voltage.
The voltage is
higher than 160 V
AC.
Check (3).
(3) The alarm has occurred
during acceleration.
Check that the bus
voltage during
acceleration is 200 V
DC or more.
The voltage is less
than 200 V DC.
Increase the
acceleration time
constant. Or
increase the power
supply capacity.
The voltage is 200 V
DC or more.
Check (4).
(4) The servo amplifier is
malfunctioning.
Check the bus voltage
value.
The power supply
voltage is 160 V AC
or more, but the bus
voltage is less than
200 V DC.
Replace the servo
amplifier.

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Alarm No.: 12 Name: Memory error 1 (RAM)
Alarm content A part (RAM) in the servo amplifier has a failure.
Detail
No. Detail name Cause Check method Check result Action Target
12.1 RAM error 1 (1) A part in the servo
amplifier has a failure.
Disconnect the cables
except for the power
supply, and then
check the
repeatability.
It is repeatable. Replace the servo
amplifier.
[A]
[B]
[C]
It is not repeatable. Check (2).
(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
12.6 RAM error 6
Alarm No.: 13 Name: Clock error
Alarm content A part in the servo amplifier has a failure.
A clock transmitted from the controller has a failure.
Detail
No. Detail name Cause Check method Check result Action Target
13.1 Clock error 1 (1) A part in the servo
amplifier has a failure.
Disconnect the cables
except for the power
supply, and then
check the
repeatability.
It is repeatable. Replace the servo
amplifier.
[A]
[B]
[C]
It is not repeatable. Check (2).
(2) A clock transmitted
from the controller has
a failure.
Check if the alarm
occurs when you
connect the amplifier
to the controller.
It occurs. Replace the
controller.
[B]
It does not occur. Check (3).
(3) 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 (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.
[A]
[B]
[C]
13.2 Clock error 2 Check it with the check method for [AL. 13.1].
13.3 Clock error 3

1. SERVO AMPLIFIER TROUBLESHOOTING
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Alarm No.: 14 Name: Control process error
Alarm content The process did not complete within the specified time.
[C]: A part (communication IC) in the servo amplifier is failure.
Detail
No. Detail name Cause Check method Check result Action Target
14.1 Control
process error 1
(1) The parameter setting is
incorrect.
Check if the parameter
setting is incorrect.
It is incorrect. Set it correctly. [A]
[B]
[C]
It is correct. Check (2).
(2) 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.
It has no failure. Check (3).
(3) The servo amplifier is
malfunctioning.
Replace the servo
amplifier, and then
check the
repeatability.
It is not repeatable. Replace the servo
amplifier.
14.2 Control
process error 2
(1) The parameter setting is
incorrect.
Check if the parameter
setting is incorrect.
It is incorrect. Set it correctly.
It is correct. Check (2).
(2) 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.
It has no failure. Check (3).
(3) The servo amplifier is
malfunctioning.
Replace the servo
amplifier, and then
check the
repeatability.
It is not repeatable. Replace the servo
amplifier.
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
14.C Control process
error 12
(1) 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.
[C]
It has no failure. Check (2).
(2) The servo amplifier is
malfunctioning.
Replace the servo
amplifier, and then
check the
repeatability.
It is not repeatable. Replace the servo
amplifier.
14.D Control process
error 13
Check it with the check method for [AL. 14.C].

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Alarm No.: 15 Name: Memory error 2 (EEP-ROM)
Alarm content A part (EEP-ROM) in the servo amplifier has a failure.
Detail
No. Detail name Cause Check method Check result Action Target
15.1 EEP-ROM error
at power on
(1) EEP-ROM is
malfunctioning at power-
on.
Disconnect the cables
except for the power
supply, and then
check the
repeatability.
It is repeatable. Replace the servo
amplifier.
[A]
[B]
[C]
It is not repeatable. Check (2).
(2) 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.
It has no failure. Check (3).
(3) The number of write
times exceeded
100,000.
Check if parameters,
point tables, or
programs are changed
very frequently.
It has been changed. Replace the servo
amplifier. Change
the process so as to
reduce the number
of times of changing
parameters, point
tables, and programs
after replacement.
15.2 EEP-ROM error
during operation
(1) EEP-ROM is
malfunctioning during
normal operation.
Check if the alarm
occurs when you
change parameters
during normal
operation.
It occurs. Replace the servo
amplifier.
[A]
[B]
[C]
It does not occur. Check (2).
(2) A write error occurred
while tuning results
were processed.
Check if the alarm
occurs after an hour
from power-on.
It takes an hour or
more.
Replace the servo
amplifier.
It takes less than an
hour.
Check (3).
(3) 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.
15.4 Home position
information
read error
(1) EEP-ROM is
malfunctioning at power-
on.
Disconnect the cables
except for the power
supply, and then
check the
repeatability.
It is repeatable. Replace the servo
amplifier.
[C]
It is not repeatable. Check (2).
(2) Multiple rotation data
saved as a home
position and read from
EEP-ROM were failure.
Check if the home
position was set
correctly.
It has a failure. Make home position
setting again.
It has no failure. Check (3).
(3) 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.
It has no failure. Check (4).
(4) The number of write
times exceeded
100,000.
Check if parameters
have been used very
frequently.
It has been changed. Replace the servo
amplifier. Change
the process to use
parameters less
frequently after
replacement.