Yaskawa Sigma-5 User Manual: Design and Maintenance - Rotary Motors - Manual (Page 290)

9.2 Warning Displays
9-25
T
roubleshooting
A.920
Regenerative
Overload:
Warning before
the alarm A.320
occurs
The power supply volt-
age exceeds the speci-
fied range.
Measure the power supply voltage.
Set the power supply voltage within
the specified range.
The external regenera-
tive resistance, servo
amplifier capacity, or
regenerative resistor
capacity is insufficient
or a continuous regener-
ative state occurs. Check the operating conditions or
capacity using the capacity selection
software SigmaJunmaSize+, etc.
Change the regenerative resistance,
regenerative resistor capacity, or SER-
VOPACK capacity. Reconsider the
operating conditions using the capac-
ity selection software SigmaJunma-
Size+, etc.
Regenerative power
continuously flowed
back because negative
load was continuously
applied.
Check the load on the servomotor dur-
ing operation.
Reconsider the system including the
servo, machine, and operation condi-
tions.
A921
Dynamic Brake
Overload:
Warning before
the alarm A.731
occurs
The servomotor is
driven by an external
force. Check the operating conditions.
Do not drive the motor with external
force.
The rotating energy at a
DB stop exceeds the DB
resistance capacity. Check the operating frequency of the
DB with power consumed by DB
resistance monitor (Un00B).
• Reduce the servomotor reference
speed.
• Reduce the moment of inertia.
• 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 connection
is incorrect.
Check the battery connection. Connect the battery correctly.
The battery voltage is
lower than the specified
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
Command
Option Module
IF Data Setting
Warning 1
An incorrect parameter
number was sent to the
SERVOPACK from the
host controller or com-
mand option module.
– Specify the correct parameter number.
A.94B
Command
Option Module
IF Data Setting
Warning 2
Out-of-range data was
sent to the SERVO-
PACK from the host
controller or command
option module.
–
Specify the value of the parameter
within the allowable range.
A.94C
Command
Option Module
IF Data Setting
Warning 3
Incorrect parameter data
was sent to the SERVO-
PACK from the host
controller or command
option module.
–
Specify the value of the parameter
within the allowable range.
A.94D
Command
Option Module
IF Data Setting
Warning 4
The incorrect parame-
ter size was sent to the
SERVOPACK from the
host controller or com-
mand option module.
– Specify the correct parameter size.
(cont’d)
Warning
Display
Warning Name
Situation at Warning
Occurrence
Cause Corrective Actions