Mitsubishi Electric MELSERVO-J4 Instruction Manual page 112

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: E2 Name: Servo motor overheat warning
Alarm content
Detail
Detail name
No.
E2.1 Servo motor (1) The temperature of the
temperature
warning
Alarm No.: E3 Name: Absolute position counter warning
Alarm content
Detail
Detail name
No.
E3.1 Multi-revolution (1) The travel distance
counter travel
distance excess
warning
E3.2 Absolute (1) Something near the
position counter
warning
(2) An encoder is
E3.4 Absolute (1) A home position was
positioning
counter EEP-
ROM writing
frequency
warning
E3.5 Encoder Check it with the check method for [AL. E3.2].
absolute
positioning
counter
warning
[AL. 46.2 Abnormal temperature of servo motor 2] can occur.
Cause
Check it with the check method for [AL. 46.2].
linear servo motor or
direct drive motor
reached 85% of the
occurrence level of [AL.
46.2 Abnormal
temperature of servo
motor 2].
The multi-revolution counter value of the absolute position encoder exceeded the maximum range.
Absolute position encoder pulses are faulty.
An update cycle is short for writing multi-revolution counter value of the absolute position encoder to EEP-
ROM.
Cause
Check the value of
from the home position the multi-revolution
is 32768 rev or more in counter.
the absolute position
system.
Check the noise,
device caused it. ambient temperature,
etc.
Replace the servo
malfunctioning. motor, and then check
the repeatability.
Check if the operation
renewed (EEP-ROM was within the
write) twice or more in following conditions
10 minutes in the servo between the number
amplifier due to rotation of gear teeth on
to the same direction in machine side ([Pr.
short time in the point PA06] CMX) and
table method of the servo motor speed
positioning mode,
(N).
degree setting with the
program method, or the
indexer method.
Check method Check result
Check method Check result
It is 32768 rev or
more.
It has a failure.
It has no failure.
It is not repeatable.
The operation was
out of conditions.
≤
When CMX 2000,
<
N 3076.7 r/min
>
When CMX 2000,
<
N 3276.7 - (CMX
×
0.1) r/min
When (CMX/CDV)
is reduced to its
lowest terms,
CMX ≤ 15900
1 - 105
Action Target
[A]
[B]
[WB]
[GF]
Action Target
Review operation [A]
range. Execute the [GF]
home position return
again.
After the power is
surely cycled,
perform home
position return again.
Take [A]
countermeasures [B]
against its cause. [WB]
[RJ010]
After the power is
[GF]
surely cycled,
perform home
position return again.
Check (2).
Replace the servo
motor.
Set the command [A]
speed within the [GF]
conditions.
Set the number of
gear teeth on
machine side within
the conditions.
After the power is
surely cycled,
perform home
position return again.