YASKAWA Sigma-V Series User Manual page 262

Alarm Number:
Alarm Name
(Alarm Description)
The servomotor rotates because
of external force.
The rotating energy at a DB stop
exceeds the DB resistance capac-
ity.
A.730:
A.731:
Dynamic Brake
The setting of Pn001.0 (Servo-
Overload
motor Power OFF or Alarm Gr.1
(An excessive power
Stop Mode) is not correct.
consumption of dynamic
brake was detected.)
The setting of Pn601 does not
agree with the dynamic brake
resistance that is connected.
The connection of the dynamic
brake unit is faulty.
A fault occurred in the SERVO-
PACK.
The inrush current limit resistor
operation frequency at the main
A.740:
circuit power supply ON/OFF
Overload of Surge
operation exceeds the allowable
Current Limit Resistor
range.
(The main circuit power
is turned ON/OFF too
A fault occurred in the SERVO-
frequently.)
PACK or converter.
The surrounding air temperature
is too high.
The overload alarm has been
reset by turning OFF the power
too many times.
A.7A0:
Heat Sink Overheated
Excessive load or operation
(Detected when the
beyond the regenerative energy
SERVOPACK's heat
processing capacity.
sink temperature
exceeds 100°C.)
Incorrect installation orientation
of the SERVOPACK or/and
insufficient space around the
SERVOPACK.
A fault occurred in the SERVO-
PACK.
A.7AB:
The fan inside the SERVOPACK
Built-in Fan in
stopped.
SERVOPACK
Stopped
Cause Investigative Actions
Check the operation status.
Check the power consumed by DB
resistance (Un00B) to see how
many times the DB has been used.
Check the setting of Pn001.0.
Check the setting of Pn601.
Check the wiring between the
dynamic brake unit and DU, DV,
DW, and CN115 is correct and
securely connected.
−
−
−
Check the surrounding air tempera-
ture using a thermostat.
Check the alarm history display
(Fn000) to see if the overload alarm
was reported.
Check the accumulated load ratio
(Un009) to see the load during oper-
ation, and the regenerative load
ratio (Un00A) to see the regenera-
tive energy processing capacity.
Check the installation conditions of
the SERVOPACK.
−
Check for foreign matter or debris
inside the SERVOPACK.
8.1 Alarm Displays
(cont'd)
Corrective Actions
Take measures to ensure the servo-
motor 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.
To not use the dynamic brake, set
Pn001.0 to 2. (The dynamic brake
will not be used and the motor will
coast to a stop.)
Set Pn601 correctly.
Correctly wire and securely connect
the dynamic brake unit with DU,
DV, DW, and CN115.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Reduce the frequency of turning the
main circuit power supply ON/OFF.
The SERVOPACK or converter
may be faulty. Replace the SERVO-
PACK or converter.
Decrease the surrounding air tem-
perature by improving the installa-
tion conditions of the SERVOPACK.
Change the method for resetting the
alarm.
Reconsider the load and operating
conditions.
Install the SERVOPACK correctly
as specified.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Remove foreign matter or debris
from the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
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