Mitsubishi Electric MELSERVO-J4 Instruction Manual page 108

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 9A Name: Optional unit input data error warning
Alarm content
Detail
Detail name
No.
9A.1 Optional unit (1) The MR-D01 extension
input data sign
error
(2) Both of + and - signs
(3) The - sign is set at
(4) The MR-D01 extension
9A.2 Optional unit
(1) Other than "0" to "9" is
BCD input data
error
Alarm No.: 9B Name: Error excessive warning
Alarm content
Detail
Detail name
No.
9B.1 Excess droop (1) The servo motor power
pulse 1 warning
(2) The connection of the
(3) The connection of the
(4) The torque limit has
(5) A moving part collided
(6) The torque is
(7) Power supply voltage
(8) Acceleration/
The BCD input data setting is incorrect when MR-D01 extension IO unit is connected.
Cause
Check if MR-D01 is
IO unit is not connected correctly.
connected.
Check the sign of the
are on or off. optional unit input
data.
Check the sign of the
incremental value optional unit input
command. data.
Replace the MR-D01,
IO unit is and then check the
malfunctioning. repeatability.
Check the BCD input
set in a digit. data.
Droop pulses have exceeded the warning occurrence level.
Cause
Check the servo
cable was motor power cable.
disconnected.
Check the wiring of
servo motor is incorrect. U/V/W.
Check if the encoder
encoder cable is cable is connected
incorrect. correctly.
Check if the limiting
been enabled. torque is in progress.
Check if it collided.
against the machine.
Check the peak load
insufficient. ratio.
Check the bus voltage
dropped. value.
Set a longer
deceleration time deceleration time
constant is too short.
constant, and then
check the
repeatability.
Check method Check result
It is not connected.
It is connected.
Both are on or both
are off.
Only one of the
signs is on.
The - sign is set.
The + sign is set.
It is not repeatable.
A value out of range
is set.
Check method Check result
It is disconnected.
It is not
disconnected.
It is incorrect.
It is correct.
It is incorrect.
It is correct.
The limiting torque
is in progress.
The limiting torque
is not in progress.
It collided.
It did not collide.
The torque is
saturated.
The torque is not
saturated.
The bus voltage is
low.
The bus voltage is
high.
It is not repeatable.
It is repeatable.
1 - 101
Action Target
Connect it correctly. [A]
Check (2).
Turn on one of the
signs only.
Check (3).
Set it to +.
Check (4).
Replace the MR-
D01.
Set a value from "0"
to "9".
Action Target
Repair or replace [A]
the servo motor [B]
power cable. [WB]
[GF]
Check (2).
Connect it correctly.
Check (3).
Connect it correctly.
Check (4).
Increase the torque
limit value.
Check (5).
Check operation
pattern.
Check (6).
Reduce the load or
review the operation
pattern. Or use a
larger capacity
motor.
Check (7).
Check the power
supply voltage and
power supply
capacity.
Check (8).
Increase the
acceleration/
deceleration time
constant.
Check (9).