YASKAWA SGD7S-1R9D Product Manual page 533

Problem Possible Cause
Servomotor
There is a faulty connection
Speed Is
in the Servomotor wiring.
Unstable
A failure occurred in the SER-
VOPACK.
The count-up direction of the
Servomotor
linear encoder does not
Moves with- match the forward direction
of the Moving Coil in the
out a Refer-
motor.
ence Input
Polarity detection was not
performed correctly.
The setting of Pn001 (2001
hex) = n.X (Servo OFF
or Alarm Group 1 Stopping
Method) is not suitable.
The Dynamic Brake Resistor
Dynamic
is disconnected.
Brake Does
Not Operate
There was a failure in the
dynamic brake drive circuit.
15.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
Confirmation
The connector connec-
tions for the power line
(U, V, and W phases) and
the encoder or Serial
Converter Unit may be
unstable. Turn OFF the
Servo System. Check the
wiring.
–
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 (2001 hex) =
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
Tighten any loose ter-
−
minals or connectors
and correct the wiring.
Turn OFF the Servo
−
System. Replace the
SERVOPACK.
Change the setting of
Pn080 (2080 hex) =
n.X (Motor Phase
Selection).
page 5-20
Match the linear
encoder direction and
Servomotor direction.
Correct the settings for
−
the polarity detection-
related parameters.
Set Pn001 (2001 hex) =
−
n.X correctly.
Turn OFF 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 Servo
System. Replace the
SERVOPACK.
Continued on next page.
15
15-53