15.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
15-53
15
Maintenance
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. Turn OFF the
Servo System. Check the
wiring.
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.
–
Turn OFF the Servo
System. Replace the
SERVOPACK.
−
The count-up direction of the
linear encoder does not
match the forward direction
of the Moving Coil in the
motor.
Check the directions.
Change the setting of
Pn080 (2080 hex) =
n.
X
(Motor Phase
Selection).
Match the linear
encoder direction and
Servomotor direction.
Polarity detection was not
performed correctly.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between
±
10
°
.
Correct the settings for
the polarity detection-
related parameters.
−
Dynamic
Brake Does
Not Operate
The setting of Pn001 (2001
hex) = n.
X (Servo OFF
or Alarm Group 1 Stopping
Method) is not suitable.
Check the setting of
Pn001 (2001 hex) =
n.
X.
Set Pn001 (2001 hex) =
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.
Turn OFF the Servo
System. Replace the
SERVOPACK. To pre-
vent disconnection,
reduce the load.
−
There was a failure in the
dynamic brake drive circuit.
–
There is a defective
component in the
dynamic brake circuit.
Turn OFF the Servo
System. Replace the
SERVOPACK.
−
Continued on next page.
Continued from previous page.
Problem
Possible Cause
Confirmation
Correction
Reference