YASKAWA SGMJV User Manual page 344

10 Troubleshooting
10.1.2 Troubleshooting of Alarms
Alarm:
Alarm Name
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
10-12
Cause
Incorrect wiring or contact fault
of servomotor and encoder.
Operation beyond the overload
protection characteristics.
Excessive load was applied dur-
ing operation because the servo-
motor was not driven due to
mechanical problems.
A SERVOPACK fault occurred.
The servomotor rotates because
of external force.
The rotating 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 wiring.
Check the servomotor overload
characteristics and executed run
command.
Check the executed run command
and servomotor speed.
−
Check the operation status.
Check the DB resistor power con-
sumption monitor (Un00B) to see
how many times the DB has been
used.
−
−
−
Check the surrounding air tempera-
ture using a thermostat.
Check the alarm trace back monitor
(Fn000) to see if the overload alarm
was reported.
Check the accumulated load ratio
monitor Un009 to see the load dur-
ing operation, and the regenerative
load ratio monitor Un00A to see the
regenerative energy processing
capacity.
Check the SERVOPACK installa-
tion conditions.
−
Check for foreign matter or debris
inside the SERVOPACK.
Corrective Actions
Confirm that the servomotor and
encoder are correctly wired.
Reconsider the load conditions and
operation conditions. Or, increase
the servomotor capacity.
Remove the mechanical problems.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Take measures to ensure the servo-
motor will not rotate because of
external force.
• Reduce the servomotor reference
speed.
• Reduce the moment of inertia
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.