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

Page: 671 / 802

16 - 116
16. INDEXER POSITIONING OPERATION
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 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.