Mitsubishi Electric MELSERVO-J4 Instruction Manual Trouble Shooting page 27

1. TROUBLESHOOTING
Alarm No.: 25 Name: Absolute position erased
Alarm content
Detail
Detail name
No.
25.1 Servo motor (1) Power was switched on
encoder -
Absolute
position erased
(2)
(3)
(4)
(5) A battery cable is
(6)
(7)
(8) The servo amplifier is
(9) An encoder is
The absolute position data is faulty.
The power was switched on for the first time in the absolute position detection system.
After the scale measurement encoder was set to the absolute position detection system, the power was
switched on for the first time.
Cause
Check if this is the first
for the first time in the time in the absolute
absolute position position detection
detection system. system.
The battery was Check if the battery
removed (replaced) was removed
when the control circuit (changed) when the
power supply was off. control circuit power
supply was off.
The battery voltage is Check the battery
low. The battery is voltage with a tester.
consumed.
The voltage has Check if a
dropped greatly in the recommended cable
encoder cable wired to is used for the
the battery. encoder cable.
Check for the loose
malfunctioning. connection with a
tester.
There is a loose Check for the loose
connection of the connection with a
encoder cable on the tester. Measure the
servo motor side. voltage on the servo
motor side.
The absolute position Check if the absolute
storage unit was not position storage unit is
connected for using a connected correctly.
direct drive motor.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Replace the servo
malfunctioning. motor, and then check
the repeatability.
Check method Check result
This is the first time.
This is not the first
time.
It was removed.
It was not removed.
It is less than about 3
V DC.
It is about 3 V DC or
more.
It is not used.
It is used.
It has a failure.
It has no failure.
It has a failure.
It has no failure.
It is not connected.
It is connected.
It is not repeatable.
It is repeatable.
It is not repeatable.
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Action Target
Check that the battery [A]
is mounted, and [B]
make home position [WB]
return. [RJ010]
Check (2).
Check that the battery
is mounted, and
make home position
return.
Check (3).
Replace the battery.
Check (4).
Use a recommended
cable.
Check (5).
Replace the battery
cable.
Check (6).
Repair or replace the
encoder cable.
Check (7).
Connect the absolute [A]
position storage unit [B]
correctly.
[WB]
Check (8).
Replace the servo [A]
amplifier. [B]
[WB]
Check (9).
[RJ010]
Replace the servo
motor.