YASKAWA Sigma-V Series User Manual page 273

8 Troubleshooting
8.2.2 Troubleshooting of Warnings
Warning Num-
ber: Warning
Name (Warning
Description)
A.920:
Regenerative
Overload
(Warning before
the alarm A.320
occurs)
A.921:
Dynamic Brake
Overload
(Warning before
the alarm A.731
occurs)
A.930:
Absolute
Encoder Battery
Error
(The absolute
encoder battery
voltage is lower
than the specified
value.)
∗ Only when an
absolute encoder
is connected.
A.94A
Data Setting
Warning 1
(Parameter Num-
ber Error)
A.94B
Data Setting
Warning 2
(Out of Range)
A.94C
Data Setting
Warning 3
(Calculation Er-
ror)
8-24
Cause
The power supply volt-
age exceeds the speci- Measure the power supply voltage.
fied limit.
Insufficient regenera-
tive resistance, regener-
ative resistor capacity,
Check the operating condition or the
SERVOPACK capacity,
capacity using the capacity selection
or converter capacity.
Software SigmaJunmaSize+, etc.
Or, regenerative power
has been continuously
flowing back.
Regenerative power
continuously flowed
Check the load to the servomotor
back because negative
during operation.
load was continuously
applied.
The servomotor rotates
because of external Check the operation status.
force.
The rotating energy at a Check the power consumed by DB
DB stop exceeds the DB resistance (Un00B) to see how many
resistance capacity. times the DB has been used.
A fault occurred in the
SERVOPACK or con- −
verter.
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 fault occurred in the
multi-winding drive −
unit.
Refer to 8.3 Monitoring Communica-
tion Data on Occurrence of an Alarm
Disabled parameter
or Warning to determine which
number was used.
command was the cause of the
warning.
Refer to 8.3 Monitoring Communica-
Attempted to send val- tion Data on Occurrence of an Alarm
ues outside the range to or Warning to determine which
the command data. command was the cause of the
warning.
Refer to 8.3 Monitoring Communica-
tion Data on Occurrence of an Alarm
Calculation result of set
or Warning to determine which
value is incorrect.
command was the cause of the
warning.
Investigative Actions
(cont'd)
Corrective Actions
Set the power supply voltage within
the specified range.
Change the regenerative resistance,
regenerative resistor capacity, SER-
VOPACK capacity, or converter
capacity. Reconsider the operating
conditions using the capacity selection
software SigmaJunmaSize+, etc.
Reconsider the system including servo
drives, machine, and operating condi-
tions.
Take measures to ensure the servomo-
tor will not rotate because of external
force.
Reconsider the following:
• Reduce the motor reference speed.
• Reduce the moment of inertia ratio.
• Reduce the number of times of the
DB stop operation.
The SERVOPACK or converter may
be faulty. Replace the SERVOPACK
or converter.
Reconnect the battery.
Replace the battery.
The multi-winding drive unit may be
faulty. Replace the multi-winding
drive unit.
Use the correct parameter number.
Set the value of the parameter within
the allowable range.
Set the value of the parameter within
the allowable range.