Mitsubishi Electric Melservo-J4 Instruction Manual page 116

Alarm No.: E3
Alarm content
Detail Detail name
No.
E3.1 Multi-revolution
counter travel
distance excess
warning
E3.2 Absolute
position counter
warning
E3.4 Absolute
positioning
counter EEP-
ROM writing
frequency
warning
E3.5 Encoder
absolute
positioning
counter warning
Alarm No.: E4
Alarm content
Detail Detail name
No.
E4.1 Parameter
setting range
error warning
1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
114
1.5 Remedies for warnings
Name: Absolute position counter warning
 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 method
(1) The travel distance Check the value of the
from the home position multi-revolution counter.
is 32768 rev or more in
the absolute position
system.
(1) Something near the Check the noise, ambient
device caused it. temperature, etc.
(2) An encoder is Replace the servo motor,
malfunctioning. and then check the
repeatability.
(1) A home position was Check if the operation
renewed (EEP-ROM was within the following
write) twice or more in conditions between the
10 minutes in the servo number of gear teeth on
amplifier due to rotation machine side ([Pr. PA06]
to the same direction in CMX) and servo motor
short time in the point speed (N).
table method of the
positioning mode,
degree setting with the
program method, or the
indexer method.
Check it with the check method for [AL. E3.2].
Name: Parameter warning
 Out of the setting range was attempted to write during parameter writing.
Cause Check method
(1) A parameter was set to Check the parameter
out of range with the setting value set with the
servo system controller. servo system controller.
Check result
It is 32768 rev or more.
There is a problem in the
surrounding.
There is no problem in
the surrounding.
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
Check result
It is out of setting range.
Action Target
Review operation range. [A]
Execute the home [GF]
position return again.
After the power is surely
cycled, perform home
position return again.
Take countermeasures [A]
against its cause. [B]
After the power is surely [WB]
cycled, perform home [RJ010]
position return again. [GF]
Check (2).
Replace the servo motor.
Set the command speed [A]
within the conditions. [GF]
Set the number of gear
teeth on machine side
within the conditions.
After the power is surely
cycled, perform home
position return again.
Action Target
Set it within the range. [B]
[WB]
[RJ010]