YASKAWA SIGMA-7 Series User Manual

6.3 Troubleshooting Based on the Operation and Conditions of the Servomotor
6-49
6
Maintenance
Abnormal
Noise from
Servomotor
The machine mounting is not
secure.
Turn OFF the power sup-
ply to the servo system.
Check to see if there is
misalignment in the cou-
pling.
Align the coupling.
–
Turn OFF the power sup-
ply to the servo system.
Check to see if the cou-
pling is balanced.
Balance the coupling.
–
The bearings are defective.
Turn OFF the power sup-
ply to the servo system.
Check for noise and
vibration around the bear-
ings.
Replace the Servomo-
tor.
–
There is a vibration source at
the driven machine.
Turn OFF the power sup-
ply to the servo system.
Check for any foreign
matter, damage, or defor-
mation in the machine’s
moving parts.
Consult with the
machine manufacturer.
–
Noise interference occurred
because of incorrect I/O sig-
nal cable specifications.
Turn OFF the power sup-
ply to the servo system.
Check the I/O signal
cables to see if they sat-
isfy specifications. Use
shielded twisted-pair
cables or screened
twisted-pair cables with
conductors of at least
0.12 mm
2
(stranded wire).
Use cables that satisfy
the specifications.
–
Noise interference occurred
because an I/O signal cable
is too long.
Turn OFF the power sup-
ply to the servo system.
Check the lengths of the
I/O signal cables.
The I/O signal cables
must be no longer than
3 m.
–
Noise interference occurred
because of incorrect Encoder
Cable specifications.
Turn OFF the power sup-
ply to the servo system.
Check the Encoder Cable
to see if it satisfies speci-
fications. Use shielded
twisted-pair cables or
screened twisted-pair
cables with conductors of
at least 0.12 mm
2
(stranded wire).
Use cables that satisfy
the specifications.
–
Noise interference occurred
because the Encoder Cable
is too long.
Turn OFF the power sup-
ply to the servo system.
Check the length of the
Encoder Cable.
• Rotary Servomotors:
The Encoder Cable
length must be 50 m
max.
• Linear Servomotors:
Make sure that the
Serial Converter Unit
cable is no longer
than 20 m and that
the Linear Encoder
Cable and the Sensor
Cable are no longer
than 15 m each.
–
Noise interference occurred
because the Encoder Cable
is damaged.
Turn OFF the power sup-
ply to the servo system.
Check the Encoder Cable
to see if it is pinched or
the sheath is damaged.
Replace the Encoder
Cable and correct the
cable installation envi-
ronment.
–
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