YASKAWA SIGMA-7 Series User Manual

6.3 Troubleshooting Based on the Operation and Conditions of the Servomotor
6-47
6
Maintenance
Servomotor
Does Not
Start
A failure occurred in the
SERVOPACK.
–
Turn OFF the power
supply to the servo
system.
Replace the SERVO-
PACK.
–
The polarity detection was
not executed.
Check the setting of
Pn080 =n.X (Polar-
ity Sensor Selection).
Correct the parameter
setting.
*
Check the inputs to the
SV_ON (Servo ON) com-
mand.
• If you are using an
incremental linear
encoder, send the
SV_ON command
from the host control-
ler.
• If you are using an
absolute linear
encoder, execute
polarity detection.
*
Servomotor
Moves
Instanta-
neously,
and Then
Stops
There is a mistake in the Ser-
vomotor wiring.
Turn OFF the power sup-
ply to the servo system.
Check the wiring.
Wire the Servomotor
correctly.
–
There is a mistake in the wir-
ing of the encoder or Serial
Converter Unit.
Turn OFF the power sup-
ply to the servo system.
Check the wiring.
Wire the Serial Con-
verter Unit correctly.
–
There is a mistake in the lin-
ear encoder wiring.
Turn OFF the power sup-
ply to the servo system.
Check the wiring.
Wire the cable cor-
rectly.
–
The setting of Pn282 (Linear
Encoder Scale Pitch) is not
correct.
Check the setting of
Pn282.
Correct the setting of
Pn282.
*
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).
Place the linear
encoder and motor in
the same 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.
–
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 power sup-
ply to the servo system.
Check the wiring.
Tighten any loose ter-
minals or connectors
and correct the wiring.
–
Continued on next page.
Continued from previous page.
Problem Possible Cause Confirmation Correction Reference

YASKAWA SIGMA-7 Series Specifications

General

Encoder Resolution	24-bit absolute encoder
Pollution Degree	2
Cooling Method	Natural cooling or forced air cooling
Control Method	Vector control
Communication Protocols	EtherCAT, MECHATROLINK-III
Input Voltage	AC 200 V, AC 400 V
Rated Output	Varies by model
Safety Function	STO (Safe Torque Off), SS1 (Safe Stop 1), SS2 (Safe Stop 2), SLS (Safely Limited Speed), SBC (Safe Brake Control)
Power Supply Voltage	AC 200 V, AC 400 V
Rated Output Current	Varies by model
Protection Functions	Overload, overvoltage, undervoltage, overheat, short circuit
Operating Temperature	0°C to 55°C
Storage Temperature	-20°C to 65°C
Vibration Resistance	5.9 m/s² at 10 Hz to 55 Hz
Ambient Humidity	5% to 95% RH (non-condensing)
Altitude	Up to 1000 m
Installation	Panel mounted