Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 235

8. TROUBLESHOOTING
Alarm No.: A.50 Name: Overload 1
Description
Detailed Detailed
display Name
50.1 Overload 1) Electromagnetic brake
thermal 1
error during
operation
(Continuous
2) Servo amplifier is used
operation
protection)
3) Servo system is unstable
4) After the overload alarm
5) Servo amplifier fault
50.2 Overload 1) The work collided against
thermal 2
error during
operation
2) Power cables breakage
(Short-time
operation
3) Incorrect connection with
protection)
4) Electromagnetic brake
5) Servo amplifier is used
6) Servo system is unstable
7) Servo amplifier fault
8) Encoder faulty.
Load exceeded overload protection characteristic of servo amplifier.
Cause
operates.
exceeding its continuous
output current.
and resonating.
occurrence, the operation
is restarted without the
cooling time.
the structural part.
the servo motor
operates.
exceeding its continuous
output current.
and oscillating.
Checking method
Check if the Operates.
electromagnetic brake
does not operate
Does not operate.
during operation.
Check the effective Effective load ratio
load ratio using the is too high.
status display or MR
Configurator.
Effective load ratio
is small.
Check if resonance Resonance occurs.
occurs.
Resonance does
not occur.
Check if the alarm was No.
reset after 30 minutes
had past since the
Yes.
alarm occurrence.
Check if the alarm Alarm does not
occurs after replacing occur.
the servo amplifier.
Check if the work Collided.
collided against the
structural part.
Did not collide.
Check the power An error is found.
cables.
No error.
Check the wiring of U, An error is found.
V and W.
No error.
Execute the checking methods mentioned in the alarm display "50.1".
Check if the alarm Alarm does not
occurs after replacing occur.
the servo motor.
8 - 18
Result Action
Check the wiring.
Check 2).
Reduce load.
Check operation pattern.
Replace the servo motor
to one that provides larger
output.
Check 3).
Execute the gain
adjustment.
Check 4).
Reset the alarm after the
sufficient time.
Check 5).
Replace the servo
amplifier.
Check the operation
pattern.
Check 2).
Repair the power cables.
Check 3).
Wire correctly.
Check 4).
Replace the servo motor.