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8 - 2 8. TROUBLESHOOTING 8.2 Remedies for alarms CAUTION When any alarm has occurred, eliminate i t s cause, ensure safety, then reset the alarm, and restart operation. Otherwise, injury ma y occur. If an absolute positi…

8 - 1

8. TROUBLESHOOTING

POINT

As soon as an alarm occurs, make the Servo off status and interrupt the main

circuit power.

If an alarm/warning has occurred, refer to this chapter and remove its cause.

8.1 Alarms and warning list

When a fault occurs during operation, the corresponding alarm or warning is displayed. If any alarm or warning

has occurred, refer to section 8.2 or 8.3 and take the appropriate action. When an alarm occurs, the ALM turns

OFF.

After its cause has been removed, the alarm can be deactivated in any of the methods marked

in the alarm

deactivation column. The alarm is automatically canceled after removing the cause of occurrence.

Alarm deactivation Display Name

Display Name Power Error CPU

Warnings

92 Battery cable disconnection warning

OFF ON reset reset 96 Home position setting warning

Alarms

10 Undervoltage 9F Battery warning

12 Memory error 1 (RAM) E0 Excessive regeneration warning

13 Clock error E1 Overload warning 1

15 Memory error 2 (EEP-ROM) E3 Absolute position counter warning

16 Encoder error 1 (At power on) E4 Parameter warning

17 Board error E6 Servo forced stop warning

19 Memory error 3 (Flash-ROM) E7 Controller forced stop warning

1A Motor combination error E8 Cooling fan speed reduction warning

20 Encoder error 2 E9 Main circuit off warning

24 Main circuit error EC Overload warning 2

25 Absolute position erase ED Output watt excess warning

30 Regenerative error

(Note 1)

31 Overspeed

32 Overcurrent

33 Overvoltage

34 Receive error 1

(Note 2)

35 Command frequency error

36 Receive error 2

37 Parameter error

45 Main circuit device overheat

(Note 1)

46 Servo motor overheat

(Note 1)

47 Cooling fan error

50 Overload 1

(Note 1)

51 Overload 2

(Note 1)

52 Error excessive

8A USB communication time-out error

8E USB communication error

888 Watchdog

Note 1. Deactivate the alarm about 30 minutes of cooling time after removing the cause of occurrence.

2. In some controller communication status, the alarm factor may not be removed.

8 - 2

8. TROUBLESHOOTING

8.2 Remedies for alarms

CAUTION

When any alarm has occurred, eliminate its cause, ensure safety, then reset the

alarm, and restart operation. Otherwise, injury may occur.

If an absolute position erase (25) occurred, always make home position setting

again. Not doing so may cause unexpected operation.

As soon as an alarm occurs, mark Servo-off and power off the main circuit and

control circuit.

POINT

When any of the following alarms has occurred, do not deactivate the alarm

and resume operation repeatedly. To do so will cause the servo amplifier/servo

motor to fail. Remove the cause of occurrence, and leave a cooling time of

more than 30 minutes before resuming operation. To protect the main circuit

elements, any of these servo alarms cannot be deactivated from the servo

system controller until the specified time elapses after its occurrence. Judging

the load changing condition until the alarm occurs, the servo amplifier

calculates this specified time automatically.

Regenerative error (30)

Overload 1 (50)

Overload 2 (51)

The alarm can be deactivated by switching power off, then on or by the error

reset command

CPU reset from the servo system controller. For details, refer

to section 8.1.

When an alarm occurs, the trouble (ALM) switches off and the dynamic brake is operated to stop the servo

motor. At this time, the display indicates the alarm No.

The servo motor comes to a stop. Remove the cause of the alarm in accordance with this section. Use the MR

Configurator to refer to a factor of alarm occurrence.

Display Name Definition Cause Action

10 Undervoltage Power supply voltage

dropped.

MR-J3-

160VAC or less

MR-J3-

B1:

83VAC or less

MR-J3-

B4:

280VAC or less

1. Power supply voltage is low. Check the power supply.

2. There was an instantaneous control

power failure of 60ms or longer.

3. Shortage of power supply capacity

caused the power supply voltage to

drop at start, etc.

4. The bus voltage dropped to the

following value or less.

MR-J3-

B: 200VDC

MR-J3-

B1: 158VDC

MR-J3-

B4: 380VDC

5. Faulty parts in the servo amplifier

Checking method

Alarm (10) occurs if power is

switched on after disconnection

of all cables but the control

circuit power supply cables.

Change the servo amplifier.

8 - 3

8. TROUBLESHOOTING

Display Name Definition Cause Action

12 Memory error 1

(RAM)

RAM, memory fault Faulty parts in the servo amplifier

Checking method

Alarm (any of 12 and 13)

occurs if power is switched on

after disconnection of all cables

but the control circuit power

supply cables.

Change the servo amplifier.

13 Clock error Printed board fault

Clock error

transmitted from the

controller

Faulty controller

Checking method

Alarm (13) occurs, if servo

controller is used in multiple CPU

system.

Change the servo system controller.

15 Memory error 2

(EEP-ROM)

EEP-ROM fault

1. Faulty parts in the servo amplifier

Checking method

Alarm (15)

occurs if power is switched on

after disconnection of all cables

but the control circuit power

supply cables.

Change the servo amplifier.

2. The number of write times to EEP-

ROM exceeded 100,000.

16 Encoder error 1

(At power on)

Communication error

occurred between

encoder and servo

amplifier.

1. Encoder connector (CN2)

disconnected.

Connect correctly.

2. Encoder fault Change the servo motor.

3. Encoder cable faulty

(Wire breakage or shorted)

Repair or change the cable.

4. Encoder cable type (2-wire, 4-wire)

selection was wrong in parameter

setting.

Correct the setting in the fourth digit of

parameter No.PC04.

17 Board error 2 CPU/parts fault

Faulty parts in the servo amplifier

Checking method

Alarm (17 or 19) occurs if

power is switched on after

disconnection of all cables but the

control circuit power supply cable.

Change the servo amplifier.

19 Memory error 3

(Flash ROM)

ROM memory fault

1A Motor

combination

error

Wrong combination

of servo amplifier

and servo motor.

Wrong combination of servo amplifier

and servo motor connected.

Use correct combination.

20 Encoder error 2 Communication error

occurred between

encoder and servo

amplifier.

1. Encoder connector (CN2)

disconnected.

Connect correctly.

2. Encoder cable faulty

(Wire breakage or shorted)

Repair or change the cable.

3. Encoder fault Change the servo motor.

24 Main circuit error Ground fault

occurred at the servo

motor power (U,V

and W phases) of

the servo amplifier.

1. Power input wires and servo motor

power wires are in contact.

Connect correctly.

2. Sheathes of servo motor power

cables deteriorated, resulting in

ground fault.

Change the cable.

3. Main circuit of servo amplifier failed.

Checking method

Alarm (24) occurs if the servo is

switched on after disconnecting

the U, V, W power cables from

the servo amplifier.

Change the servo amplifier.

25 Absolute

position erase

Absolute position

data in error

1. Voltage drop in encoder

(Battery disconnected.)

After leaving the alarm occurring for a few

minutes, switch power off, then on again.

Always make home position setting again.

2. Battery voltage low Change the battery.

Always make home position setting again.

3. Battery cable or battery is faulty.

Power was switched

on for the first time in

the absolute position

detection system.

4. Home position not set. After leaving the alarm occurring for a few

minutes, switch power off, then on again.

Always make home position setting again.