Mitsubishi Electric Melservo-J4 Instruction Manual page 111

Alarm No.: 9A Name: Optional unit input data error warning
 The BCD input data setting is incorrect when MR-D01 extension IO unit is connected.
Alarm content
Detail Detail name Cause
No.
9A.1 Optional unit (1)
input data sign
error
(2)
(3)
(4)
9A.2 Optional unit (1)
BCD input data
error
Alarm No.: 9B Name: Error excessive warning
 Droop pulses have exceeded the warning occurrence level.
Alarm content
Detail Detail name Cause
No.
9B.1 Excess droop (1)
pulse 1 warning
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Check method
The MR-D01 extension Check if MR-D01 is
IO unit is not connected correctly.
connected.
Both of + and - signs Check the sign of the
are on or off. optional unit input data.
The - sign is set at Check the sign of the
incremental value optional unit input data.
command.
The MR-D01 extension Replace the MR-D01,
IO unit is and then check the
malfunctioning. repeatability.
Other than "0" to "9" is Check the BCD input
set in a digit. data.
Check method
The servo motor power Check the servo motor
cable was power cable.
disconnected.
The connection of the Check the wiring of U/V/
servo motor is incorrect. W.
The connection of the Check if the encoder
encoder cable is cable is connected
incorrect. correctly.
The torque limit has Check if the limiting
been enabled. torque is in progress.
A moving part collided Check if it collided.
against the machine.
The torque is Check the peak load
insufficient. ratio.
Power supply voltage Check the bus voltage
dropped. value.
Acceleration/ Set a longer deceleration
deceleration time time constant, and then
constant is too short. check the repeatability.
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 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 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
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 the [A]
servo motor power cable. [B]
[WB]
Check (2).
[GF]
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).
1.5 Remedies for warnings
1
109