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10. TROUBLESHOOTING
Display Name Definition
Cause
Action
A51 Overload 2 Machine collision or
the like caused max.
For the time of the
alarm occurrence,
refer to the section
12.1.
1. Machine struck something. 1. Check operation pattern.
2. Install limit switches.
2. 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.
3. Servo system is instable and
hunting.
1. Repeat acceleration/deceleration to
execute auto tuning.
2. Change auto tuning response setting.
3. Set auto tuning to OFF and make gain
adjustment manually.
4. Encoder faulty.
Checking method
When the servo motor shaft is
rotated with the servo off, the
cumulative feedback pulses do not
vary in proportion to the rotary angle
of the shaft but the indication skips
or returns midway.
Change the servo motor.
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.
2. Forward torque limit (parameter
No.PA11) or reverse 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 struck something. 1. Check operation pattern.
2. Install limit switches.
7. Encoder faulty 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.
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.
A8A Serial
communication
time-out error
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.
A8E Serial
communication
error
Serial
communication error
occurred between
servo amplifier and
communication
device (e.g. personal
computer).
1. Communication cable fault
(Open cable or short circuit)
Repair or change the cable.
2. Communication device (e.g.
personal computer) faulty
Change the communication device (e.g.
personal computer).