YASKAWA SIGMA-7 Series User Manual

6.1 Alarm Displays
6.1.2 Troubleshooting Alarms
6
Maintenance
6-29
A.Cb0:
Encoder Echo-
back Error
The encoder is wired
incorrectly or there is
faulty contact.
Check the wiring of the
encoder.
Make sure that the
encoder is correctly
wired.
*1
The specifications of
the Encoder Cable are
not correct and noise
entered on it.
–
Use a shielded twisted-
pair wire cable or a
screened twisted-pair
cable with conductors of
at least 0.12 mm
2
.
–
The Encoder Cable is
too long and noise
entered on it.
–
• Rotary Servomotors:
The Encoder Cable wir-
ing distance must be 50
m max.
• Linear Servomotors:
The Encoder Cable wir-
ing distance must be 20
m max.
–
There is variation in
the FG potential
because of the influ-
ence of machines on
the Servomotor side,
such as a welder.
Check the condition of
the Encoder Cable and
connectors.
Properly ground the
machine to separate it
from the FG of the
encoder.
–
Excessive vibration or
shock was applied to
the encoder.
Check the operating
conditions.
Reduce machine vibra-
tion.
Correctly install the Ser-
vomotor or linear encoder.
–
A failure occurred in
the encoder.
–
Turn the power supply to
the SERVOPACK OFF and
ON again. If the alarm still
occurs, the Servomotor or
linear encoder may be
faulty. Replace the Servo-
motor or linear encoder.
–
A failure occurred in
the SERVOPACK.
–
Turn the power supply to
the SERVOPACK OFF and
ON again. If the alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
–
A.CC0:
Multiturn Limit
Disagreement
The multiturn limit of
the encoder is differ-
ent from that of the
SERVOPACK. Or, the
multiturn limit of the
SERVOPACK has
been changed.
Check the setting of
Pn205 in the SERVO-
PACK.
Change the setting if the
alarm occurs.
*1
A failure occurred in
the SERVOPACK.
–
Turn the power supply to
the SERVOPACK OFF and
ON again. If the alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
–
Continued on next page.
Continued from previous page.
Alarm Number:
Alarm Name
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