Mitsubishi Electric MELSERVO-J4 Instruction Manual page 43

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 25 Name: Absolute position erased
Alarm content
Detail
Detail name
No.
25.1 Servo motor (5) The MR-BT6VCBL03M
encoder -
Absolute
position erased
(6) The battery voltage is
(7) The voltage has
(8) A battery cable is
(9) There is a loose
(10) The absolute position
(11) The servo amplifier is
(12) An encoder is
The absolute position data is faulty.
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 the MR-
junction battery cable is BT6VCBL03M
not connected to the junction battery cable
encoder cable. is connected to the
encoder cable.
Check the battery
low. The battery is voltage with a tester.
consumed. When an MR-
BAT6V1BJ battery for
junction battery cable
was used, check the
voltage of the
connector (orange) for
servo amplifier.
Check if a
dropped greatly in the recommended cable is
encoder cable wired to used for the encoder
the battery. cable.
Check for the loose
malfunctioning. connection with a
tester.
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.
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
It is not connected.
It is connected.
It is less than 3 V
DC.
It is 3 V DC or more. Check (7).
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
Connect the MR- [A]
BT6VCBL03M [B]
junction battery cable [RJ010]
to the encoder cable. [GF]
Check (6).
Replace the battery. [A]
[B]
[WB]
[RJ010]
[GF]
Use a
recommended wire.
Check (8).
Replace the battery
cable.
Check (9).
Repair or replace
the encoder cable.
Check (10).
Connect the absolute [A]
position storage unit [B]
correctly. [WB]
[GF]
Check (11).
Replace the servo [A]
amplifier. [B]
[WB]
Check (12).
[RJ010]
[GF]
Replace the servo
motor.