YASKAWA SGDV SERVOPACK User Manual

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9.2 Warning Displays
9-23
9
Troubleshooting
A.911: 
Vibration
Abnormal vibration was
de
tected at the motor
speed.
Check for abnormal noise from the
serv
omotor, and check the speed and
force waveforms during operation.
Reduce the motor speed or reduce the
servo gain
by using the function such
as one-parameter tuning.
The mass ratio (Pn103)
va
lue is greater than the
actual value or is greatly
changed.
Check the mass ratio.
Set the mass ratio (Pn103) to an
approp
riate value.
A.920: 
Regenerative
Overlo
ad
(Warning before
the alar
m A.320
occurs)
The power supply volt-
age exceeds the speci-
fied limit.
Measure the power supply voltage.
Set the power supply voltage within
the specified range.
Insufficient external
regen
erative resistance,
regenerative resistor
capacity, or SERVO-
PACK capacity.
Or, regenerative power
has been
continuously
flowing back.
Check the operating condition or the
capacity using
the capacity selection
Software SigmaJunmaSize+, etc.
Change the regenerative resistanc
e,
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 to the servomotor dur-
ing operation.
Reconsider the system including servo
drives,
machine, and operating condi-
tions.
A.921: 
Dynamic Brake
Overlo
ad
(Warning before
the alar
m A.731
occurs)
The servomotor moves
because of
external
force.
Check the operation status.
Take measures to ensure the servomo-
tor will not move beca
use of external
force.
The moving energy at a
DB s
top exceeds the DB
resistance capacity.
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 mass ratio.
• Reduce the number of times of the
DB sto
p operation.
A SERVOPACK fault
oc
curred.

The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.941: 
Change of Pa-
rameters Re-
quires Restart
Parameters that require
the restart have been
cha
nged.
 Turn OFF the power and ON again.
(cont’d)
Warning Num-
ber: Warning
Name (Warning
Description)
Cause Investigative Actions Corrective Actions

YASKAWA SGDV SERVOPACK Specifications

General

Model	SGDV
Type	SERVOPACK
Control Modes	Position, Speed, Torque
Communication Interface	MECHATROLINK-II, MECHATROLINK-III, EtherCAT
Protection Rating	IP20
Operating Temperature	0°C to 55°C
Vibration Resistance	5.9 m/s² (0.6G) at 10-60Hz
Shock Resistance	49 m/s² (5G)
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overload, Regenerative overload, Encoder error