YASKAWA SGD7S-R70A Product Manual page 194

E-7-series ac servo drive e-7s servopack with ft/ex specification for indexing application
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8.3 Troubleshooting Based on the Operation and Conditions of the Servomotor
Problem
Servomotor
Moves with-
out a Refer-
ence Input
Dynamic
Brake Does
Not Operate
Abnormal
Noise from
Servomotor
8-54
Possible Cause
A failure occurred in the SER-
VOPACK.
The count-up direction of the
linear encoder does not
match the forward direction
of the Moving Coil in the
motor.
Polarity detection was not
performed correctly.
The setting of Pn001 =
n.X (Servo OFF or
Alarm Group 1 Stopping
Method) is not suitable.
The dynamic brake resistor is
disconnected.
There was a failure in the
dynamic brake drive circuit.
The Servomotor vibrated
considerably while perform-
ing the tuning-less function
with the default settings.
The machine mounting is not
secure.
Confirmation
Check the directions.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between ±10°.
Check the setting of
Pn001 = n.X.
Check the moment of
inertia, motor speed, and
dynamic brake frequency
of use. If the moment of
inertia, motor speed, or
dynamic brake frequency
of use is excessive, the
dynamic brake resis-
tance may be discon-
nected.
Check the waveform of
the motor speed.
Turn OFF the power sup-
ply to the servo system.
Check to see if there are
any loose mounting
screws.
Turn OFF the power sup-
ply to the servo system.
Check to see if there is
misalignment in the cou-
pling.
Turn OFF the power sup-
ply to the servo system.
Check to see if the cou-
pling is balanced.
Continued from previous page.
Correction
Reference
Turn OFF the power
supply to the servo
system. Replace the
SERVOPACK.
Change the setting of
Pn080 = n.X
(Motor Phase Selec-
tion).
Match the linear
encoder direction and
Servomotor direction.
Correct the settings for
the polarity detection-
related parameters.
Set Pn001 = n.X
correctly.
Turn OFF the power
supply to the servo
system. Replace the
SERVOPACK. To pre-
vent disconnection,
reduce the load.
There is a defective
component in the
dynamic brake circuit.
Turn OFF the power
supply to the servo
system. Replace the
SERVOPACK.
Reduce the load so
that the moment of
inertia ratio or mass
ratio is within the allow-
able value, or increase
the load level or reduce
the rigidity level in the
tuning-less level set-
tings.
Tighten the mounting
screws.
Align the coupling.
Balance the coupling.
Continued on next page.

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