YASKAWA Σ-V Series User Manual page 257

8 Troubleshooting
8.1.2 Troubleshooting of Alarms
Alarm:
Alarm Name
A.550:
Maximum Speed
Setting Error
A.710:
A.720:
Overload
A.710: High Load
A.720: Low Load
A.730:
A.731:
Dynamic Brake
Overload
(An excessive power
consumption of dynamic
brake was detected.)
A.740:
Overload of Surge
Current Limit Resistor
(The main circuit power
is turned ON/OFF too
frequently.)
A.7A0:
Heat Sink Overheated
(Detected when the heat
sink temperature
exceeds 100°C.)
A.7AB:
Built-in Fan in
SERVOPACK
Stopped
8-12
Cause
The Pn385 setting is greater than
the maximum speed.
Incorrect wiring or contact fault
of linear servomotor and linear
scale.
Operation beyond the overload
protection characteristics.
Excessive load was applied dur-
ing operation because the linear
servomotor was not driven due to
mechanical problems.
The setting of the linear scale
pitch (Pn282) is incorrect.
The setting of the motor phase
selection (Pn080.1) is incorrect.
A SERVOPACK fault occurred.
The linear servomotor moves
because of external force.
The moving energy at a DB stop
exceeds the DB resistance capac-
ity.
A SERVOPACK fault occurred.
The inrush current limit resistor
operation frequency at the main
circuit power supply ON/OFF
operation exceeds the allowable
range.
A SERVOPACK fault occurred.
The surrounding air temperature
is too high.
The overload alarm has been
reset by turning OFF the power
too many times.
Excessive load or operation
beyond the regenerative energy
processing capacity.
Incorrect SERVOPACK installa-
tion orientation or/and insuffi-
cient space around the
SERVOPACK.
A SERVOPACK fault occurred.
The fan inside the SERVOPACK
stopped.
Investigative Actions
Check the value of Pn385 and
Un010 (maximum allowable motor
speed or maximum allowable
encoder output resolution).
Check the wiring.
Check the linear servomotor over-
load characteristics and executed
run command.
Check the executed run command
and linear servomotor speed.
Check the setting of Pn282.
Check the setting of Pn080.1.
−
Check the operation status.
Check the DB resistor power con-
sumption (Un00B) to see how many
times the DB has been used.
−
−
−
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 SERVOPACK installa-
tion conditions.
−
Check for foreign matter or debris
inside the SERVOPACK.
Corrective Actions
Set Pn385 to a value equal to or
lower than the motor maximum
speed.
Confirm that the linear servomotor
and linear scale are correctly wired.
Reconsider the load conditions and
operation conditions. Or, increase
the linear servomotor capacity.
Remove the mechanical problems.
Correct the setting of Pn282.
Correct the setting of Pn080.1.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Take measures to ensure the linear
servomotor will not move because
of external force.
• Reduce the linear servomotor ref-
erence speed.
• Reduce the mass ratio.
• Reduce the number of times of
the DB stop operation.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Reduce the frequency of turning the
main circuit power supply ON/OFF.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Decrease the surrounding air tem-
perature by improving the SERVO-
PACK installation conditions.
Change the method for resetting the
alarm.
Reconsider the load and operation
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.