8-18
8-3 Troubleshooting
Troubleshooting
8
Machine position
is misaligned.
Problem with the coupling
between the Servomotor
axis and the machine.
Check that the coupling of the Ser-
vomotor and the machine is not
misaligned.
Re-tighten the coupling.
Replace with a tight
coupling.
Deceleration stop
command is received from
the host controller.
Check the control ladder on the
host controller.
Review the control on the
host controller.
The Servomotor
is slow to stop
even if the RUN
command is
turned OFF while
the Servomotor is
rotating.
Load inertia is too large.
Check the load inertia.
Dynamic brake resistor is
disconnected.
Review the load inertia.
Replace the Servomotor
and Servo Drive with
appropriate models.
Dynamic brake is disabled.
Check if the dynamic brake
is disabled or has failed.
If disabled, enable it.
If there is a failure, or
disconnection of the
resistor, replace the
Servomotor.
Overshoots when
starting or
stopping.
The Position Loop Gain
(Pn010) is too large.
Review the Position Loop Gain
(Pn010).
Adjust the gain to avoid
overshooting.
Poor balance between the
Speed Loop Integration
Time Constant (Pn012)
and the Speed Loop Gain
(Pn011).
Review the Speed Loop Integration
Time Constant (Pn012) and the
Speed Loop Gain (Pn011).
Use CX-Drive and analog
monitors (SP, IM) to mea-
sure the response and adjust
the gain.
Inappropriate machine
rigidity setting by realtime
autotuning.
Review the machine rigidity setting.
Match the machine rigidity
setting to the load rigidity.
Inertial ratio setting differs
from the load.
Review the Inertial Ratio (Pn020).
Match the Inertia Ratio
(Pn020) to the load.
Symptom
Probable cause
Items to check
Countermeasure