YASKAWA SGD7S-****20A Series Product Manual page 480

Problem Possible Cause
A failure occurred in the
SERVOPACK.
Servomotor
The count-up direction of the
Moves with-
linear encoder does not
match the forward direction
out a Refer-
of the Moving Coil in the
ence Input
motor.
Polarity detection was not
performed correctly.
The setting of Pn001 =
n.X (Motor Stopping
Method for Servo OFF and
Group 1 Alarms) is not suit-
able.
The dynamic brake resistor is
Dynamic
disconnected.
Brake Does
Not Operate
There was a failure in the
dynamic brake drive circuit.
12.5 Troubleshooting Based on the Operation and Conditions of the Servomotor
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.
–
Continued from previous page.
Correction Reference
Turn OFF the power
supply to the servo
system.
–
Replace the SERVO-
PACK.
Change the setting of
Pn080 = n.X
(Motor Phase
Sequence Selection).
page 5-22
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 SERVO-
–
PACK. To prevent dis-
connection, reduce the
load.
There is a defective
component in the
dynamic brake circuit.
Turn OFF the power
–
supply to the servo
system.
Replace the SERVO-
PACK.
Continued on next page.
12
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