Mitsubishi Electric MELSERVO-J4 Instruction Manual page 42

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
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) 1) When an MR-
(3) 1) When an MR-
(4) The encoder cable was
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 this is the
for the first time in the first time you switched
absolute position on the power in the
detection system. absolute position
detection system.
Check if the battery
BAT6V1SET(-A) was removed in this
battery or MR- way when the control
BT6VCASE battery circuit power supply
case was used, CN4 was off.
of the servo amplifier
was disconnected
during control circuit
power supply off.
2) When an MR-
BAT6V1BJ battery
for junction battery
cable was used, both
CN4 of the servo
amplifier and MR-
BAT6V1BJ battery
for junction battery
cable were
disconnected from
the MR-
BT6VCBL03M
junction battery
cable.
Check if the power
BAT6V1SET(-A) was turned off in this
battery or MR- state.
BT6VCASE battery
case was used, the
power was turned
off with the battery
disconnected from
CN4.
2) When an MR-
BAT6V1BJ battery
for junction battery
cable was used, the
power was turned off
with the battery
disconnected from
CN4 and MR-
BT6VCBL03M
junction battery
cable.
Check if the encoder
disconnected with the cable was
MR-BAT6V1BJ battery disconnected in this
disconnected from MR- state.
BT6VCBL03M junction
battery cable.
Check method Check result
This is the first time. Check that the
This is not the first
time.
It was removed.
It was not removed.
It was turned off.
It was not turned off. MR-BAT6V1BJ
It was disconnected. Check that the MR-
It was not
disconnected.
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Action Target
[A]
battery is mounted [B]
correctly, and make [WB]
home position return. [RJ010]
[GF]
Check (2).
Check that the
battery is mounted
correctly, and make
home position
return.
Check (3).
Check that the
battery is mounted
correctly, and make
home position
return.
battery for junction
battery cable: Refer
to (4).
MR-BAT6V1SET(-A)
battery or MR-
BT6VCASE battery
case: Refer to (6).
[A]
BAT6V1BJ battery is [B]
connected to CN4 [RJ010]
and MR- [GF]
BT6VCBL03M
junction battery
cable, and execute a
home position return.
Check (5).