YASKAWA SGMJV User Manual page 354

10 Troubleshooting
10.2.2 Troubleshooting of Warnings
Warning
Warning Name
Display
A.911 Vibration
Regenerative
Overload:
A.920
Warning before
the alarm A320
occurs
Dynamic Brake
Overload:
A921
Warning before
the alarm A.731
occurs
Absolute
Encoder Battery
Error
(The absolute
encoder battery
A.930
voltage is lower
than the specified
value.)
(Only when an
absolute encoder
is connected.)
Change of
A.941 Parameters
Requires Restart
10-22
Situation at Warning
Occurrence
Check whether unusual sound is gen-
Unusual vibration was
erated from the motor, and check the
detected while the
speed, and torque waveform of the
motor was rotating.
motor.
The moment of inertia
ratio (Pn103) is larger
Check the moment of inertia ratio.
than the actual value or
greatly changes.
The power supply volt-
age is in excess of the Measure the power supply voltage.
specified range.
The external regenera-
tive resistance, servo
amplifier capacity, or Check the operating conditions or
regenerative resistor capacity using the capacity selection
capacity is insufficient software SigmaJunmaSize+, etc.
or a continuous regener-
ative state occurs.
Regenerative power
continuously flowed
Check the load on the servomotor dur-
back because negative
ing operation.
load was continuously
applied.
The servomotor is
driven by an external Check the operating conditions.
force.
The rotating energy at a Check the operating frequency of the
DB stop exceeds the DB DB with power consumed by DB
resistance capacity. resistance monitor (Un00B).
A SERVOPACK fault
−
occurred.
The battery connection
Check the battery connection.
is incorrect.
The battery voltage is
lower than the specified Measure the battery voltage.
value 2.7 V.
A SERVOPACK fault
−
occurred.
Parameters that require
−
the restart have been
changed.
Cause
Lower the motor rotation speed or
lower the servo gain by using the
function such as one-parameter tun-
ing.
Set an appropriate value for the
moment of inertia (Pn103).
Set the power supply voltage within
the specified range.
Change the regenerative resistance,
regenerative resistor capacity, or SER-
VOPACK capacity. Reconsider the
operating conditions using the capac-
ity selection software SigmaJunma-
Size+, etc.
Reconsider the system including the
servo, machine, and operation condi-
tions.
Do not drive the motor with external
force.
• Reduce the servomotor reference
speed.
• Reduce the moment of inertia.
• Reduce the number of times of the
DB stop operation.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Reconnect the battery.
Replace the battery.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Turn OFF the power and ON again.
Corrective Actions