Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

Page: 372 / 802

11 - 15
11. TROUBLESHOOTING
Display Name Definition Cause Action
(Note 2)
Alarm
detailed
information
A52
Error excessive The difference
between the model
position and the
actual servo motor
position exceeds
three rotations.
(Refer to the
function block
diagram in section
1.1.2.)
1. Acceleration/deceleration time
constant is too small.
Increase the
acceleration/deceleration
time constant.
4
2. Forward rotation torque limit
(parameter No.PA11) or reverse
rotation torque limit (parameter
No.PA12) are too small.
Increase the torque limit
value.
3. Motor cannot be started due to
torque shortage caused by power
supply voltage drop.
1. Check the power supply
capacity.
2. Use servo motor which
provides larger output.
4. Position loop gain (parameter
No.PB08) value is small.
Increase set value and
adjust to ensure proper
operation.
5. Servo motor shaft was rotated by
external force.
1. When torque is limited,
increase the limit value.
2. Reduce the load.
3. Use servo motor that
provides larger output.
6. Machine collision
1. Check operation pattern.
2. Install limit switches.
7. Encoder fault
Change the servo motor.
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.
Connect correctly.
9. Wire breakage of power supply
cable.
Repair the cable.
10. Commands were inputted when the
torque limit value is set to "0".
Set torque limit to proper
value.
8
A61
Operation
alarm
Setting mistake of
auxiliary function.
"1" or "3" is set for the auxiliary function
of point table No.255. Set "0" or "2" for the value
of auxiliary function.
1
A8A
Serial
communication
time-out error
USB
communication or
RS-422
communication
stopped for longer
than the specified
time. 1. Communication cable breakage.
Repair or change the
communication cable.
2. Communication cycle longer than
regulated time.
Shorten the communication
cycle.
3. Wrong protocol.
Correct protocol.