8-17
8-3 Troubleshooting
8
Troubleshooting
Servomotor
rotation is
unstable.
The Servomotor Power
Cable or Encoder Cable is
wired incorrectly.
Check the wiring of the Servomotor
Power Cable’s phases U, V, and W
and check the Encoder Cable’s
wiring.
Wire correctly.
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.
Check the mechanical system’s
coupling section.
Review and adjust the
machine.
Try rotating the Servomotor without
a load. (Disconnect it from the
mechanical system.)
The load’s moment of
inertia exceeds the Servo
Drive’s allowed value.
Try rotating the Servomotor without
a load. (Disconnect it from the
mechanical system.)
•
Lighten the load.
•
Replace the Servomotor
and Servo Drive with
higher capacity models.
The pulse signal line’s
connections are loose.
Check the pulse signal wiring at the
Controller and Servo Drive.
Wire correctly.
Check the Controller’s command
pulse type and the Servo Drive’s
command pulse type.
Set the Servo Drive’s pulse
type to match the Control-
ler’s command pulse type.
The gain is wrong.
---
•
Use normal mode
autotuning.
•
Adjust the gain manually.
The CN1 input signal is
chattering.
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).
Correct the wiring so that
there is no chattering.
The Servomotor
is overheating.
The ambient temperature is
too high.
Check that the ambient tempera-
ture around the Servomotor is
below 40
°
C.
Lower the ambient tempera-
ture to 40
°
C or less. (Use a
cooler or fan.)
Ventilation is obstructed.
Check to see whether anything is
blocking ventilation.
Improve ventilation.
The Servomotor is
overloaded.
Try rotating the Servomotor without
a load. (Disconnect it from the
mechanical system.)
•
Reduce the load.
•
Replace the Servomotor
and Servo Drive with
higher capacity models.
The Servomotor is
vibrating.
The holding
brake is
ineffective.
Power is supplied to the
holding brake.
Check whether power is supplied to
the holding brake.
Configure a circuit that cuts
power to the holding brake
when the motor stops and
the load is held by the
holding brake.
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.
The load inertia is too large.
Check the following:
•
Is the load too large?
•
Is the Servomotor speed too
high?
Re-evaluate the load
conditions and replace the
Servomotor/Servo Drive with
appropriate models if
necessary.
The stop circuit failed.
---
Replace the Servo Drive.
Symptom
Probable cause
Items to check
Countermeasures
Summary of Contents for R88D-GT series
Page 20: ...18 Table of Contents ...
Page 234: ...3 133 3 8 Reactor Specifications 3 Specifications ...
Page 448: ...7 37 7 5 Manual Tuning 7 Adjustment Functions ...
Page 474: ...8 25 8 5 Periodic Maintenance 8 Troubleshooting ...
Page 475: ...Chapter 9 Appendix 9 1 Connection Examples 9 1 9 2 Parameter Tables 9 11 ...
Page 509: ......