Mitsubishi Electric MELSERVO-J2-Super Series Instruction Manual page 281

12. TROUBLESHOOTING
Display Name
AL.52 Error excessive The droop pulse
AL.61 Operation
alarm
AL.72 Option unit
communication
error
AL.76 Option unit ID
error
AL.8A Serial
communication
time-out error
AL.8D CC-Link alarm Normal
Definition
1. Acceleration/deceleration time
value of the constant is too small.
deviation counter
2. Internal torque limit 1 (parameter
exceeded the encoder
No.28) is too small.
resolution 10
3. Motor cannot be started due to
[pulse].
torque shortage caused by power
supply voltage drop.
4. Position control gain 1 (parameter
No.7) value is small.
5. Servo motor shaft was rotated by
external force.
6. Machine struck something.
7. Encoder faulty
8. Wrong connection of servo motor.
Servo amplifier's output terminals
U, V, W do not match servo
motor's input terminals U, V, W.
"1" or more has been Setting mistake of auxiliary function
set to auxiliary of point table No. 31.
function of point
table No. 31.
The option unit is 1. The option unit is not connected.
not connected.
2. Option unit board fault.
The servo amplifier The option unit not supported by the
is receiving an servo amplifier is connected.
unsupported ID.
RS-232C or RS-422 1. Communication cable breakage.
communication
2. Communication cycle longer than
stopped for longer
parameter No. 23 setting.
than the time set in
3. Wrong protocol.
parameter No.23.
1. The station number switch setting
communication with is 0 or not less than 65.
the master station
2. The baudrate switch setting is
cannot be made.
outside the range 0 to 4.
3. The transmission status is
abnormal.
4. CC-Link twisted cable wiring
incorrect.
5. CC-Link twisted cable faulty.
6. The CC-Link connector has come
off.
7. The terminating resistor is not
connected.
8. Noise entered the CC-Link twisted
cable.
Cause
12 - 10
Action
Increase the acceleration/deceleration
time constant.
Increase the torque limit value.
1. Review the power supply capacity.
2. Use servo motor which provides larger
output.
Increase set value and adjust to ensure
proper operation.
1. When torque is limited, increase the
limit value.
2. Reduce load.
3. Use servo motor that provides larger
output.
1. Review operation pattern.
2. Install limit switches.
Change the servo motor.
Connect correctly.
Set "0" to auxiliary function of point table
No. 31.
Reconnect the option unit correctly.
Change the option unit.
1. Connect the option unit supported by
the servo amplifier.
2. Change the option unit.
Repair or change communication cable
Set correct value in parameter.
Correct protocol.
Set the station number to within the
range 1 to 64, and switch power on.
Set the switch to within the range 0 to 4.
Reexamine the wiring.
1. Repair or change the CC-Link twisted
cable.
2. Connect the cable or connector
correctly.
Connect the terminating resistor correctly.