Omron R88D-GT series User Manual page 466

8-3 Troubleshooting
Symptom
Servomotor
rotation is
unstable.
8
The Servomotor
is overheating.
The holding
brake is
ineffective.
The Servomotor
does not stop or
is hard to stop
even if the RUN
Command Input
(RUN) is turned
OFF while the
Servomotor is
rotating.
8-17
Probable cause
The Servomotor Power
Cable or Encoder Cable is
wired incorrectly.
The coupling system
between the Servomotor
shaft and the mechanical
system has eccentricity or
loose screws, or the torque
is fluctuating due to
engagement between
pulleys or gears.
The load's moment of
inertia exceeds the Servo
Drive's allowed value.
The pulse signal line's
connections are loose.
The gain is wrong.
The CN1 input signal is
chattering.
The ambient temperature is
too high.
Ventilation is obstructed.
The Servomotor is
overloaded.
The Servomotor is
vibrating.
Power is supplied to the
holding brake.
The load inertia is too large.
The stop circuit failed.
Items to check
Check the wiring of the Servomotor
Power Cable's phases U, V, and W
and check the Encoder Cable's
wiring.
Check the mechanical system's
coupling section.
Try rotating the Servomotor without
a load. (Disconnect it from the
mechanical system.)
Try rotating the Servomotor without
a load. (Disconnect it from the
mechanical system.)
Check the pulse signal wiring at the
Controller and Servo Drive.
Check the Controller's command
pulse type and the Servo Drive's
command pulse type.
---
Check the RUN Command Input
(RUN), Deviation Counter Reset
Input (ECRST), Zero Speed
Designation Input (VZERO),
Internally set Speed Selection 1
Input (VSEL1) and Internally Set
Speed Selection 2 Input (VSEL2).
Check that the ambient tempera-
ture around the Servomotor is
below 40°C.
Check to see whether anything is
blocking ventilation.
Try rotating the Servomotor without
a load. (Disconnect it from the
mechanical system.)
Check whether power is supplied to
the holding brake.
Check the following:
• Is the load too large?
• Is the Servomotor speed too
high?
---
Countermeasures
Wire correctly.
Review and adjust the
machine.
• Lighten the load.
• Replace the Servomotor
and Servo Drive with
higher capacity models.
Wire correctly.
Set the Servo Drive's pulse
type to match the Control-
ler's command pulse type.
• Use normal mode
autotuning.
• Adjust the gain manually.
Correct the wiring so that
there is no chattering.
Lower the ambient tempera-
ture to 40°C or less. (Use a
cooler or fan.)
Improve ventilation.
• Reduce the load.
• Replace the Servomotor
and Servo Drive with
higher capacity models.
Configure a circuit that cuts
power to the holding brake
when the motor stops and
the load is held by the
holding brake.
Re-evaluate the load
conditions and replace the
Servomotor/Servo Drive with
appropriate models if
necessary.
Replace the Servo Drive.