8 - 5
8. TROUBLESHOOTING
Alarm No.: A.12
Name: Memory error 1 (RAM)
Description
Servo amplifier internal part (CPU) is faulty.
Detailed
display
Detailed
Name
Cause
Checking method
Result
Action
12.1
CPU built-in
RAM fault
1) Faulty parts in the servo
amplifier
Remove all cables
except for the control
circuit power supply
and check if the alarm
occurs.
Alarm occurs.
Replace the servo
amplifier.
Alarm does not
occur.
Check 2).
2) Fault in the surrounding
environment
Check if any noise
entered the power
supply.
Check if any connector
is shorted.
An error is found.
Take the appropriate
measures according to the
cause.
Alarm No.: A.13
Name: Clock error
Description
Printed board fault
CPU clock fault
Detailed
display
Detailed
Name
Cause
Checking method
Result
Action
13.1
Clock error
1) Printed board fault
Remove all cables
except for the control
circuit power supply
and check if the alarm
occurs.
Alarm occurs.
Replace the servo
amplifier.
2) Parts fault
Alarm does not
occur.
Check 3).
3) Fault in the surrounding
environment
Check if any noise
entered the power
supply.
Check if any connector
is shorted.
An error is found.
Take the appropriate
measures according to the
cause.
Alarm No.: A.15
Name: Memory error 2 (EEP-ROM)
Description
Servo amplifier internal part (EEP-ROM) is faulty.
Detailed
display
Detailed
Name
Cause
Checking method
Result
Action
15.1
EEP-ROM
error at
power-on
1) EEP-ROM operation fault
when the power is on.
Remove all cables
except for the control
circuit power supply
and check if the alarm
occurs.
Alarm occurs.
Replace the servo
amplifier.
Alarm does not
occur.
Check 2).
2) Fault in the surrounding
environment
Check if any noise
entered the power
supply.
Check if any connector
is shorted.
An error is found.
Take the appropriate
measures according to the
cause.
No error.
Replace the servo
amplifier.
15.2
EEP-ROM
error during
operation
1) EEP-ROM operation fault
during the normal
operation
Check if the alarm
occurs when the
parameter is changed
during the normal
operation.
Alarm occurs.
Replace the servo
amplifier.
Summary of Contents for MELSERVO-JN Series
Page 31: ... 22 MEMO ...
Page 49: ...2 6 2 INSTALLATION MEMO ...
Page 181: ...5 30 5 DISPLAY AND OPERATION SECTIONS MEMO ...
Page 199: ...6 18 6 GENERAL GAIN ADJUSTMENT MEMO ...
Page 303: ...11 46 11 OPTIONS AND PERIPHERAL EQUIPMENT MEMO ...
Page 351: ...12 48 12 SERVO MOTOR MEMO ...
Page 445: ...13 94 13 POSITIONING MODE MEMO ...