9.2 Warning Displays
9-25
9
T
roub
lesho
oti
ng
A.920:
Regenerative
Overload
(Warning before
the alarm A.320
occurs)
The power supply
voltage exceeds the
specified limit.
Measure the power supply voltage.
Set the power supply voltage within
the specified range.
Insufficient external
regenerative resis-
tance, regenerative
resistor capacity, or
SERVOPACK capac-
ity.
Or, regenerative power
has been continuously
flowing back.
Check the operating condition or the
capacity using the capacity selec-
tion Software SigmaJu,
etc.
Change the regenerative resistance,
regenerative resistor capacity, or
SERVOPACK capacity. Reconsider
the operating conditions using the
capacity selection software Sigma-
Ju, etc.
Regenerative power
continuously flowed
back because negative
load was continuously
applied.
Check the load to the servomotor
during operation.
Reconsider the system including
servo drives, machine, and operating
conditions.
A.921:
Dynamic Brake
Overload
(Warning before
the alarm A.731
occurs)
The servomotor rotates
because of external
force.
Check the operation status.
Take measures to ensure the servo-
motor will not rotate because of
external force.
The rotating energy at
a DB stop exceeds the
DB resistance capac-
ity.
Check the power consumed by DB
resistance (Un00B) to see how many
times the DB has been used.
Reconsider the following:
• Reduce the motor reference speed.
• Reduce the moment of inertia
ratio.
• Reduce the number of times of the
DB stop operation.
A SERVOPACK fault
occurred.
−
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.930:
Absolute
Encoder Battery
Error
(The absolute
encoder battery
voltage is lower
than the specified
value.)
(Only when an
absolute encoder
is connected.)
The battery connec-
tion is incorrect.
Check the battery connection.
Reconnect the battery.
The battery voltage is
lower than the speci-
fied value 2.7 V.
Measure the battery voltage.
Replace the battery.
A SERVOPACK fault
occurred.
−
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.94A
Data Setting
Warning 1
(Parameter Num-
ber Error)
Disabled parameter
number was used.
Refer to
9.3 Monitoring Communi-
cation Data on Occurrence of an
Alarm or Warning
to determine
which command was the cause of
the warning.
Use the correct parameter number.
A.94B
Data Setting
Warning 2
(Out of Range)
Attempted to send val-
ues outside the range
to the command data.
Refer to
9.3 Monitoring Communi-
cation Data on Occurrence of an
Alarm or Warning
to determine
which command was the cause of
the warning.
Set the value of the parameter within
the allowable range.
A.94C
Data Setting
Warning 3
(Calculation Er-
ror)
Calculation result of
set value is incorrect.
Refer to
9.3 Monitoring Communi-
cation Data on Occurrence of an
Alarm or Warning
to determine
which command was the cause of
the warning.
Set the value of the parameter within
the allowable range.
(cont’d)
Warning Num-
ber: Warning
Name
Cause
Investigative Actions
Corrective Actions
