Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 222

8. TROUBLESHOOTING
Alarm No.: A.12 Name: Memory error 1 (RAM)
Description
Detailed Detailed
display Name
CPU built-in 1) Faulty parts in the servo
12.1
RAM fault
2) Fault in the surrounding
Alarm No.: A.13 Name: Clock error
Description
Detailed Detailed
display Name
13.1 Clock error 1) Printed board fault
2) Parts fault
3) Fault in the surrounding
Alarm No.: A.15 Name: Memory error 2 (EEP-ROM)
Description
Detailed Detailed
display Name
15.1 EEP-ROM 1) EEP-ROM operation fault
error at
power-on
2) Fault in the surrounding
15.2 EEP-ROM 1) EEP-ROM operation fault
error during
operation
Servo amplifier internal part (CPU) is faulty.
Cause
amplifier
environment
Printed board fault
CPU clock fault
Cause
environment
Servo amplifier internal part (EEP-ROM) is faulty.
Cause
when the power is on.
environment
during the normal
operation
Checking method
Remove all cables Alarm occurs.
except for the control
circuit power supply
Alarm does not
and check if the alarm
occur.
occurs.
Check if any noise An error is found.
entered the power
supply.
Check if any connector
is shorted.
Checking method
Remove all cables Alarm occurs.
except for the control
circuit power supply
Alarm does not
and check if the alarm
occur.
occurs.
Check if any noise An error is found.
entered the power
supply.
Check if any connector
is shorted.
Checking method
Remove all cables Alarm occurs.
except for the control
circuit power supply
and check if the alarm
Alarm does not
occurs.
occur.
Check if any noise An error is found.
entered the power
supply.
Check if any connector
No error.
is shorted.
Check if the alarm Alarm occurs.
occurs when the
parameter is changed
during the normal
operation.
8 - 5
Result Action
Replace the servo
amplifier.
Check 2).
Take the appropriate
measures according to the
cause.
Result Action
Replace the servo
amplifier.
Check 3).
Take the appropriate
measures according to the
cause.
Result Action
Replace the servo
amplifier.
Check 2).
Take the appropriate
measures according to the
cause.
Replace the servo
amplifier.
Replace the servo
amplifier.