YASKAWA SGM7D-30F Product Manual page 267

3.4 Command Option Attachable-type FT82 SERVOPACKs with INDEXER Modules
3.4.9 Troubleshooting Based on the Operation and Conditions of the Servomotor
Problem
Servomotor
Moves
Instanta-
neously,
and Then
Stops
Servomotor
Speed Is
Unstable
Servomotor
Moves with-
out a Refer-
ence Input
Dynamic
Brake Does
Not Operate
3-198
Possible Cause
There is a mistake in the Ser-
vomotor wiring.
There is a mistake in the wir-
ing of the encoder or Serial
Converter Unit.
There is a faulty connection
in the Servomotor wiring.
A failure occurred in the SER-
VOPACK.
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.
Confirmation
Check the wiring.
Check the wiring.
The connector connec-
tions for the power line
(U, V, and W phases) and
the encoder or Serial
Converter Unit may be
unstable. Check the wir-
ing.
–
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
Wire the Servomotor
–
correctly.
Wire the Serial Con-
–
verter Unit correctly.
Tighten any loose ter-
minals or connectors
–
and correct the wiring.
Replace the SERVO-
–
PACK.
Set Pn001 = n.X
–
correctly.
Replace the SERVO-
PACK. To prevent dis-
–
connection, reduce the
load.
There is a defective
component in the
dynamic brake circuit.
–
Replace the SERVO-
PACK.
Continued on next page.