8-9
8-3 Troubleshooting
8
Troubleshooting
23 Encoder data error Occurs when the power
supply is turned ON or
during operation.
• The encoder signal wir-
ing is incorrect.
• Correct the wiring.
• Noise on the encoder
wiring causes incorrect
operation.
• Take measures against
noise on the encoder wir-
ing.
• The power supply volt-
age for the encoder has
dropped (especially
when the cable is long.)
• Provide the required en-
coder power supply volt-
age (5 VDC±5%).
24 Deviation counter
overflow
Occurs when the Ser-
vomotor does not ro-
tate even when
command pulses are
input.
• The Servomotor power
wiring or the encoder wir-
ing is incorrect.
• Correct the wiring.
• The Servomotor is me-
chanically being held.
• If the Servomotor shaft is
held by external force, re-
lease it.
• Release the electromag-
netic brake.
• Control PCB error. • Replace the Servo Drive.
Occurs during high-
speed rotation.
• The Servomotor power
wiring or the encoder wir-
ing is incorrect.
• Correct the wiring.
Occurs when long com-
mand pulses are given.
• Gain adjustment is insuf-
ficient.
• Adjust the gain.
• The acceleration and de-
celeration are too rapid.
• Extend the acceleration
and deceleration times.
• The load is too large. • Reduce the load.
• Select a suitable Servo-
motor.
Occurs during opera-
tion.
• The setting for the Devia-
tion Counter Overflow
Level (Pn63) was ex-
ceeded.
• Increase the setting of
Pn63.
• Slow the rotation speed.
• Reduce the load.
• Extend the acceleration
and deceleration times.
26 Overspeed Occurs during high-
speed rotation.
• The speed command in-
put is too large.
• Set the command pulse
frequency to 500 kpps
max.
• The setting for the Elec-
tronic Gear Ratio Numer-
ato
r (Pn46 o
r Pn47) is not
appropriate.
• Set Pn46 and Pn47 so
that the command pulse
frequency is 500 kpps
max.
• The maximum number of
rotations is exceeded
due to overshooting.
• Adjust the gain.
• Reduce the maximum
command speed.
• The encoder wiring is in-
correct.
• Correct the wiring.
Occurs when torque
limit switching is used.
• The Overspeed Detec-
tion Level Setting (Pn70)
or No. 2 Overspeed De-
tection Level Setting
(Pn73) has been exceed-
ed.
• If torque limit switching is
used, correctly set the al-
lowable operating speed
for Pn70 and Pn73.
Alarm
code
Error
Status when error
occurs
Cause Countermeasure
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