Mitsubishi Electric MELSERVO-J3W Series Instruction Manual page 161

8. TROUBLESHOOTING
Alarm No.47
Alarm description
Display Name
47.1 Cooling fan stop
error
47.2 Decreased
cooling fan speed
error
Alarm No.50
Alarm description
Display Name
50.1 Thermal overload
error 1 during
operation
Name: Cooling fan error
Cooling fan speed of the servo amplifier is decreased.
Cooling fan speed drops to the alarm level or lower.
Cause
(1) Foreign matter is caught
in the cooling fan.
(2) Cooling fan life expiration. Check if the fan is
(1) Foreign matter is caught
in the cooling fan.
(2) Cooling fan life expiration. Check the cumulative
Name: Overload 1
Load exceeds overload protection characteristic of servo amplifier.
Cause
(1) Electromagnetic brake is
activated.
(2) Servo amplifier is used in
excess of its continuous
output current.
(3) Servo system is instable
and causing oscillation.
(4) After the overload alarm
has been output, the
operation is restarted
without having cool-off
time.
(5) Servo amplifier is faulty.
Stop method: All axes stop
Checkpoint
Check for foreign matter Foreign matter is
caught in the cooling fan. caught.
Foreign matter is not
caught.
Fan is stopped.
stopped.
Check for foreign matter Foreign matter is
caught in the cooling fan. caught.
Foreign matter is not
caught.
Life is expired.
power supply time of the
servo amplifier.
Stop method: Corresponding axis stops
Checkpoint
Check if the Activated.
electromagnetic brake is
Not activated.
activated.
Check the effective load Effective load ratio is
ratio with MR large.
Configurator.
Effective load ratio is
small.
Check for oscillation in Oscillation is
motor. occurring.
Oscillation is not
occurring.
Check if the alarm is Not reset.
reset after waiting 30
minutes or longer
Reset.
subsequent to the output
of the alarm.
Replace the servo Not reproduced.
amplifier, and check the
reproducibility of the error.
8 - 22
Finding Action
Remove the foreign
matter.
Check (2).
Replace the servo
amplifier.
Remove the foreign
matter.
Check (2).
Replace the servo
amplifier.
Finding Action
Review the wiring.
Check (2).
Reduce load.
Check operation
pattern.
Use servo motor that
provides larger output.
Check (3).
Adjust the gain.
Check (4).
Reset the alarm after
sufficient cool-off time.
Check (5).
Replace the servo
amplifier.