Instruction manual

9 - 7
9. TROUBLESHOOTING
Display Name Definition Cause Action
1. Acceleration/deceleration time
constant is too small.
Increase the acceleration/deceleration time
constant.
2. Foward 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. Review the power supply capacity.
2. Use servo motor which provides larger
output.
4. Model loop gain 1 (parameter
No.PB07) 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. Review operation pattern.
2. Install limit switches.
7. Encoder faulty Change the servo motor.
AL.52 Error excessive
The difference
between the model
position and the
actual servomotor
position exceeds
three rotations.
(Refer to the function
block diagram in
Section 1.2.)
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.
1. Communication cable breakage. Repair or change communication cable
2. Communication cycle longer than
regulated time.
Shorten the communication cycle.
AL.8A Serial
communication
time-out error
Communication
stopped for longer
than the specified
time.
3. Wrong protocol. Correct protocol.
1. Communication cable fault
(Open cable or short circuit)
Repair or change the cable.AL.8E Serial
communication
error
Serial communication
error occurred
between servo
amplifier and
communication
device (e.g. personal
computer).
2. Communication device (e.g.
personal computer) faulty
Change the communication device (e.g.
personal computer).
(Note)
88888
Watchdog CPU, parts faulty Fault of parts in servo amplifier
Checking method
Alarm (88888) occurs if power is
switched on after disconnection of
all cables but the control circuit
power supply cable.
Change servo amplifier.
Note. At power-on, "88888" appears instantaneously, but it is not an error.
9.3 Remedies for warnings
CAUTION
If an absolute position counter warning (AL.E3) occurred, always make home
position setting again. Otherwise, misoperation may occur.
If AL.E6 or AL.EA occurs, the servo off status is established. If any other warning occurs, operation can be
continued but an alarm may take place or proper operation may not be performed. Use the optional servo
configuration software to refer to the cause of warning.
Remove the cause of warning according to this section. Use the optional MR Configulator (servo
configuration software) to refer to a factor of warning occurrence.
Display Name Definition Cause Action
1. Battery cable is open. Repair cable or changed.AL.92 Open battery
cable warning
Absolute position detection
system battery voltage is
low.
2. Battery voltage supplied from the servo
amplifier to the encoder fell to about 3V or
less.
(Detected with the encoder)
Change battery.