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12.5 Troubleshooting Based on the Operation and Conditions of the Servomotor
12-61
12
Maintenance
Servomotor
Moves with-
out a Refer-
ence Input
A failure occurred in the
SERVOPACK.
–
Turn OFF the power
supply to the servo
system.
Replace the SERVO-
PACK.
–
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 = n.
X
(Motor Phase
Sequence 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 =
n.
X (Motor Stopping
Method for Servo OFF and
Group 1 Alarms) is not suit-
able.
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.
Turn OFF the power
supply to the servo
system.
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.
Turn OFF the power
supply to the servo
system.
Replace the SERVO-
PACK.
–
Continued on next page.
Continued from previous page.
Problem
Possible Cause
Confirmation
Correction
Reference