Mitsubishi Electric MELSERVO-J4 Instruction Manual page 63

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 47 Name: Cooling fan error
Alarm content
Detail
Detail name
No.
47.1 Cooling fan (1) Foreign matter was
stop error
(2) Cooling fan life expired. Check if the cooling
47.2 Cooling fan (1) Foreign matter was
speed reduction
error
(2) Cooling fan life expired. Check the cooling fan
Alarm No.: 50 Name: Overload 1
Alarm content
Detail
Detail name
No.
50.1 Thermal (1) The servo motor power
overload error 1
during operation
(2) The connection of the
(3) The electromagnetic
(4) A current was applied to
(5) The connection
(6) The servo system is
(7) The servo amplifier is
(8) The encoder or linear
The speed of the servo amplifier cooling fan decreased.
Or the fan speed decreased to the alarm occurrence level or less.
Cause
Check if a foreign
caught in the cooling matter is caught in
fan. the cooling fan.
fan is stopping.
Check if a foreign
caught in the cooling matter is caught in
fan. the cooling fan.
speed.
Load exceeded overload protection characteristic of servo amplifier.
Cause
Check the servo motor
cable was
power cable.
disconnected.
Check the wiring of
servo motor is incorrect. U/V/W.
Check if the
brake has not released. electromagnetic
(The electromagnetic brake is released
brake has been during operation.
activated.)
Check the effective
the servo amplifier in load ratio.
excess of its continuous
output current.
Check the connection
destination of the destinations of CN2A,
encoder cable is CN2B, and CN2C.
incorrect.
Check if it is
unstable and resonating.
resonating.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Replace the servo
encoder is motor or linear
malfunctioning. encoder, and then
check the
repeatability.
Check method Check result
Something has
been caught.
Nothing has been
caught.
It is stopping.
Something has been
caught.
Nothing has been
caught.
The fan speed is
less than the alarm
occurrence level.
Check method Check result
It is disconnected.
It is not
disconnected.
It is incorrect.
It is correct.
It is not released.
It is released.
The effective load
ratio is high.
The effective load
ratio is small.
It is not correct.
It is correct.
It is resonating.
It is not resonating.
It is not repeatable.
It is repeatable.
It is not repeatable.
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Action Target
Remove the foreign [A]
matter. [B]
[WB]
Check (2).
[RJ010]
[GF]
Replace the servo
amplifier.
Remove the foreign
matter.
Check (2).
Replace the servo
amplifier.
Action Target
Repair or replace [A]
the servo motor [B]
power cable. [WB]
[RJ010]
Check (2).
[GF]
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. [WB]
Check (6).
Adjust gains. [A]
[B]
For MR-J4-03A6(-
[WB]
RJ) and MR-J4W2-
[RJ010]
0303B6, check if the
[GF]
main circuit power
supply voltage is 48
V DC even though
the setting is 24 V
DC.
Check (7).
Replace the servo
amplifier.
Check (8).
Replace the servo
motor or linear
encoder.