3.2 FT82 SERVOPACK with MECHATROLINK-II Communications References
3.2.7 Troubleshooting Based on the Operation and Conditions of the Servomotor
3-90
Servomotor
Does Not
Start
A failure occurred in the SER-
VOPACK.
–
Replace the SERVO-
PACK.
–
Servomotor
Moves
Instanta-
neously,
and Then
Stops
There is a mistake in the Ser-
vomotor wiring.
Check the wiring.
Wire the Servomotor
correctly.
–
There is a mistake in the wir-
ing of the encoder or Serial
Converter Unit.
Check the wiring.
Wire the Serial Con-
verter Unit correctly.
–
Servomotor
Speed Is
Unstable
There is a faulty connection
in the Servomotor 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.
Tighten any loose ter-
minals or connectors
and correct the wiring.
–
Servomotor
Moves with-
out a Refer-
ence Input
A failure occurred in the SER-
VOPACK.
–
Replace the SERVO-
PACK.
–
Dynamic
Brake Does
Not Operate
The setting of Pn001 =
n.
X (Servo OFF or
Alarm Group 1 Stopping
Method) is not suitable.
Check the setting of
Pn001 = n.
X.
Set Pn001 = n.
X
correctly.
–
The dynamic brake resistor is
disconnected.
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.
Replace the SERVO-
PACK. To prevent dis-
connection, reduce the
load.
–
There was a failure in the
dynamic brake drive circuit.
–
There is a defective
component in the
dynamic brake circuit.
Replace the SERVO-
PACK.
–
Continued on next page.
Continued from previous page.
Problem
Possible Cause
Confirmation
Correction
Reference