Mitsubishi Electric MELSERVO-JE MR-JE-70A Instruction Manual page 238

8. TROUBLESHOOTING
Alarm No.: 47 Name: Cooling fan error
Alarm content
Display Detail name
47.2 Cooling fan (1) Foreign matter was
speed
reduction error
(2) Cooling fan life expired.
Alarm No.: 50 Name: Overload 1
Alarm content
Display Detail name
50.1 Thermal (1) The servo motor power
overload error 1
during operation
(2)
(3)
(4)
(5)
(6)
(7) The servo amplifier is
(8) An encoder is
50.2 Thermal Check it with the check method for [AL. 50.1].
overload error 2
during operation
50.3 Thermal
overload error 4
during operation
The speed of the servo amplifier cooling fan decreased.
Or the cooling fan speed decreased to the alarm occurrence level or less.
Cause
caught in the cooling fan.
Load exceeded overload protection characteristic of servo amplifier.
Cause
cable was disconnected.
The connection of the
servo motor is incorrect.
The electromagnetic
brake has not released.
(The electromagnetic
brake has been
activated.)
A current was applied to
the servo amplifier in
excess of its continuous
output current.
The connection
destination of the
encoder cable is
incorrect.
The servo system is
unstable and resonating.
malfunctioning.
malfunctioning.
Check method
Check if a foreign matter Something has been
is caught in the cooling caught.
fan.
Nothing has been
caught.
Check the cooling fan The fan speed is less
speed. than the alarm
occurrence level.
Check method
Check the servo motor It is disconnected.
power cable.
It is not disconnected.
Check the wiring of U, V, It is incorrect.
and W.
It is correct.
Check if the It is not released.
electromagnetic brake is
released during
It is released.
operation.
Check the effective load The effective load ratio is
ratio. high.
The effective load ratio is
small.
Check if the encoder It is not correct.
cable is connected
correctly.
It is correct.
Check if it is resonating. It is resonating.
It is not resonating.
Replace the servo It is not repeatable.
amplifier, and then check
the repeatability.
It is repeatable.
Replace the servo motor, It is not repeatable.
and then check the
repeatability.
8 - 17
Check result
Remove the foreign
matter.
Check (2).
Replace the servo
amplifier.
Check result
Repair or replace the
servo motor power
cable.
Check (2).
Connect it correctly.
Check (3).
Release the
electromagnetic brake.
Check (4).
Reduce the load. Or use
a larger capacity motor.
Check (5).
Connect it correctly.
Check (6).
Adjust gains.
Check (7).
Replace the servo
amplifier.
Check (8).
Replace the servo motor.
Action
Action