YASKAWA Sigma-7 SGD7S Series - Page 649

Problem Possible Cause Confirmation Correction Reference
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 Selec-
tion). Match the linear
encoder direction and
motor direction.
Ä Chap. 6.8
‘Selecting the Phase
Sequence for a Linear
Servomotor’ page 154
Polarity detection was
not performed cor-
rectly.
Check to see if elec-
trical angle 2 (elec-
trical angle from
polarity origin) at any
position is between
±10°.
Correct the settings
for the polarity detec-
tion-related parame-
ters.
−
Servomotor Speed Is
Unstable
There is a faulty con-
nection in the Servo-
motor wiring.
The connector con-
nections for the power
line (U, V, and W
phases) and the
encoder or Serial
Converter Unit may be
unstable. Turn OFF
the power supply to
the servo system.
Check the wiring.
Tighten any loose ter-
minals or connectors
and correct the wiring.
−
Servomotor Moves
without a Reference
Input
A failure occurred in
the SERVOPACK.
– Turn OFF the power
supply to 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 = n.X
(Motor Phase Selec-
tion). Match the linear
encoder direction and
Servomotor direction.
Ä Chap. 6.8
‘Selecting the Phase
Sequence for a Linear
Servomotor’ page 154
Polarity detection was
not performed cor-
rectly.
Check to see if elec-
trical angle 2 (elec-
trical angle from
polarity origin) at any
position is between
±10°.
Correct the settings
for the polarity detec-
tion-related parame-
ters.
−
Dynamic Brake Does
Not Operate
The setting of Pn001
= n.X (Motor
Stopping Method for
Servo OFF and Group
1 Alarms, Overtravel
Stopping Method) is
not suitable.
Check the setting of
Pn001 = n.X.
Set Pn001 = n.X
correctly.
−
Sigma-7 Series SERVOPACKs
Maintenance
Troubleshooting Based on the Operation and Conditions of the Servomotor
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