YASKAWA SIGMA-7 Series User Manual

6.3 Troubleshooting Based on the Operation and Conditions of the Servomotor
6-48
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.
–
Abnormal
Noise from
Servomotor
The Servomotor vibrated
considerably while perform-
ing the tuning-less function
with the default settings.
Check the waveform of
the motor speed.
Reduce the load so
that the moment of
inertia ratio or mass
ratio is within the allow-
able value, or increase
the load level or reduce
the rigidity level in the
tuning-less level set-
tings.
If the situation is not
improved, disable the
tuning-less function
(i.e., set Pn170 to
n.0) and execute
autotuning either with
or without a host refer-
ence.
*
The machine mounting is not
secure.
Turn OFF the power sup-
ply to the servo system.
Check to see if there are
any loose mounting
screws.
Tighten the mounting
screws.
–
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