Mitsubishi Electric MELSERVO MR-J4-B-RJ Series, Instruction Manual

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1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1 - 93
If [AL. E6], [AL. E7], [AL. E9], [AL. EA], or [AL. EB] occurs, the amplifier will be the servo-off status. If any
other warning occurs, operation can be continued but an alarm may take place or proper operation may not
be performed.
Remove the cause of warning according to this section. Use MR Configurator2 to refer to the cause of
warning occurrence.
Alarm No.: 90 Name: Home position return incomplete warning
Alarm content A home position return did not complete normally with the positioning function.
Detail
No.
Detail name Cause Check method Check result Action Target
90.1 Home position
return
incomplete
(1) An automatic operation
was executed at home
position return
incompletion.
Check if the home
position return was
not executed (the
following devices are
not off.).
[A]: ZP (Home
position return
completion)
[GF]: ZP2 (Home
position return
completion 2) A home position
return was not
executed. Execute a home
position return. [A]
[GF]
A home position
return was executed. Check (2).
(2) A positioning operation
was executed without
home position setting
with absolute position
after [AL. 25 Absolute
position erased]
occurred.
Check if [AL. 25
Absolute position
erased] occurred
using alarm history. [AL. 25 Absolute
position erased]
occurred. Check the battery
voltage and battery
cable if they have a
failure and execute
a home position
return after remove
the failure.
[AL. 25 Absolute
position erased] did
not occur. Check (3).
(3) With the indexer
method, [AL. E3
Absolute position
counter warning]
occurred simultaneously
with the alarm.
Check if [AL. 90.1]
occurred
simultaneously with
start of the positioning
operation. [AL. 90.1] did not
occur simultaneously
with start of the
positioning operation
but occurred during
positioning
operation. Remove the cause
of [AL. E3], and
perform home
position return.
(Check it with the
check method for
[AL. E3].)
[AL. 90.1] occurred
simultaneously with
start of the
positioning
operation. Check (4).
(4) ZP (Home position
return completion)
turned off after the
home position return
was executed.
Check if ZP (Home
position return
completion) is off. ZP (Home position
return completion) is
off.
Check the conditions
if ZP (Home position
return completion)
can be off. (Refer to
section 2.3 of "MR-
J4-_A_-RJ Servo
Amplifier Instruction
Manual (Positioning
Mode)") [A]