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8. TROUBLESHOOTING
8-2-2 Alarms
1. When any alarm has occurred, eliminate its cause, ensure safety, then
WARNING
2. If an absolute position erase alarm (A. 25) occurred, always make home
When any of the following alarms has occurred, always remove its cause
and allow about 30 minutes for cooling before resuming operation. If opera-
tion is repeated by switching control circuit power off, then on to reset the
alarm, the servo amplifier, servo motor and regenerative brake option may
NOTICE
become faulty.
When an alarm occurs, the trouble signal (ALM) switches off and the dynamic brake is operated to
stop the servomotor. At this time, the display indicates the alarm No.
Alarm Code
Display
CN1B-
CN1A-
CN1A-
19 pin
18 pin
19 pin
A. 10
0
1
0
A. 11
0
0
0
A. 12
0
0
0
A. 13
0
0
0
A. 15
0
0
0
A. 16
1
1
0
reset the alarm, and restart operation. Otherwise, injury may occur.
position setting again. Otherwise, misoperation may occur.
• Regenerative error (A. 30)
• Overload 1 (A. 50)
• Overload 2 (A. 51)
Name
Definition
Undervoltage Power supply
voltage dropped.
MR-J2- A:160V or less
MR-J2- A1: 83V or less
Board error 1 Printed board
faulty
Memory
RAM, ROM
error 1
memory fault
Clock error
Printed board
fault
Memory
EEPROM fault
error 2
Encoder
Communication
error 1
error occurred
between
encoder and
servo amplifier.
8– 7
Cause
1. Power supply voltage is low.
2. Power failed instantaneously
for 15ms or longer.
3. Shortage of power supply
capacity caused the power
supply voltage to drop at start,
etc.
4. Power switched on within 5
seconds after it had switched off.
5. Faulty parts in the servo amplifier
Checking method
Alarm (A. 10) occurs if power is
switched on after CN1A, CN1B,
and CN3 connectors are
disconnected.
Faulty parts in the servo amplifier
Checking method
Alarm (any of A. 11 to 15)
occurs if power is switched on
after CN1A, CN1B, and CN3
connectors are disconnected.
1. Encode connector disconnected. Connect correctly.
2. Encoder fault
3. Encoder cable faulty
(Wire breakage or short)
4. Combination of servo amplifier
and servo motor is not proper.
Action
Review the power
supply.
Change the servo
amplifier.
Change the servo
amplifier.
Change the servo
8
motor.
Repair or change
cable.
Use correct
combination
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