Mitsubishi Electric MELSERVO-J4 Instruction Manual page 101

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 90 Name: Home position return incomplete warning
Alarm content
Detail
Detail name
No.
90.1 Home position (5) A software stroke
return
incomplete
(6) ZP2 (Home position
A home position return did not complete normally with the positioning function.
Cause
In the I/O mode, check
limit/stroke limit was if [AL. 99 Stroke limit
detected. warning] occurred
when "_ _ _ 1" is set to
[Pr. PD12], or [AL. 98
Software stroke limit
warning] occurred
when "_ 1 _ _" is set to
[Pr. PD12].
Check if ZP2 (Home
return completion 2) position return
turned off after the completion 2) is off.
home position return
was executed.
Check method Check result
[AL. 98 Software
stroke limit warning]
or [AL. 99 Stroke
limit warning]
occurred in the I/O
mode.
[AL. 98 Software
stroke limit warning]
or [AL 99 Stroke
limit warning] did not
occur.
Or the motion mode
is set.
ZP2 (Home position
return completion 2)
is off.
1 - 94
Action Target
Move the machine [GF]
to within the limit
range, and then
make a home
position return.
When the home
position is fixed,
enable servo-on
again.
Check (6).
Check the conditions
in which ZP2 (Home
position return
completion 2) is off.
(Refer to section
2.1.2 and 5.1.2 of
"MR-J4-_GF_(-RJ)
Servo Amplifier
Instruction Manual
(I/O Mode)".)