Mitsubishi Electric MR-J4-TM Instruction Manual page 291

8. TROUBLESHOOTING
Alarm No.: 90 Name: Home position return incomplete warning
Alarm content
Detail
Detail name
No.
90.1 Home position (1) An automatic operation
return
incomplete
(2) A positioning operation
(3) In the indexer method,
(4) A software stroke
(5) Home position return
A home position return did not complete normally with the positioning function.
Cause
Check if the home
was executed when the position return has not
home position return been executed (if
had not been Home position return
completed. completion 2 (S_ZP2)
is off.).
Check if [AL. 25
was executed without Absolute position
home position setting erased] occurred
with an absolute using alarm history.
position after [AL. 25
Absolute position
erased] occurred.
Check if [AL. 90.1]
[AL. E3 Absolute occurred
position counter simultaneously with
warning] occurred the start of the
simultaneously with this
positioning operation.
alarm.
Check if [AL. 98
limit/stroke limit was Software stroke limit
detected. warning] or [AL. 99
Stroke limit warning]
occurred in the profile
mode.
Check if Home
completion 2 (S_ZP2) position return
turned off after a home completion 2 (S_ZP2)
position return was is off.
executed.
Check method Check result
A home position
return has not been
executed.
A home position
return has been
executed.
[AL. 25 Absolute
position erased]
occurred.
[AL. 25 Absolute
position erased] did
not occur.
[AL. 90.1] did not
occur
simultaneously with
the start of the
positioning
operation but
occurred during
positioning
operation.
[AL. 90.1] occurred
simultaneously with
the start of the
positioning
operation.
[AL. 98 Software
stroke limit warning]
or [AL. 99 Stroke
limit warning]
occurred in the
profile mode.
[AL. 98 Software
stroke limit warning]
or [AL 99 Stroke
limit warning] have
not yet occurred. Or
the cyclic mode has
been set.
Home position
return completion 2
(S_ZP2) is off.
8 - 10
Action Target
Execute a home [TM]
position return.
Check (2).
Check the battery
voltage and battery
cable for a failure
and execute a home
position return after
removing the failure.
Check (3).
Remove the cause of
[AL. E3], and
execute a home
position return.
(Check the check
method for [AL. E3].)
Check (4).
Move the machine
within the limit
range, and then
execute a home
position return.
When the home
position is fixed,
enable servo-on
again.
Check (5).
Check the
conditions in which
Home position
return completion 2
(S_ZP2) turns off.
(Refer to Status DO
2 described in the
MR-J4-_TM_ Servo
Amplifier Instruction
Manual for each
communication
method.)