Yaskawa Sigma-5 User Manual: Design and Maintenance - Rotary Motors - Manual (Page 277)

9 Troubleshooting
9.1.2 Troubleshooting of Alarms
9-12
A.710:
A.720:
Overload
A.710: High Load
A.720: Low Load
Incorrect wiring or contact fault
of servomotor and encoder.
Check the wiring.
Confirm that the servomotor and
encoder are correctly wired.
Operation beyond the overload
protection characteristics.
Check the servomotor overload
characteristics and executed run
command. Reconsider the load conditions and
operation conditions. Or, increase
the servomotor capacity.
Excessive load was applied dur-
ing operation because the servo-
motor was not driven due to
mechanical problems.
Check the executed run command
and servomotor speed.
Remove the mechanical problems.
A SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.730:
A.731:
Dynamic Brake
Overload
(An excessive power
consumption of dynamic
brake was detected.)
The servomotor rotates because
of external force.
Check the operation status.
Take measures to ensure the servo-
motor will not rotate because of
external force.
The rotating energy at a DB stop
exceeds the DB resistance capac-
ity.
Check the DB resistor power con-
sumption monitor (Un00B) to see
how many times the DB has been
used.
• Reduce the servomotor reference
speed.
• Reduce the moment of inertia
ratio.
• Reduce the number of times of
the DB stop operation.
A SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.740:
Overload of Surge
Current Limit Resistor
(The main circuit power
is turned ON/OFF too
frequently.)
The inrush current limit resistor
operation frequency at the main
circuit power supply ON/OFF
operation exceeds the allowable
range.
−
Reduce the frequency of turning the
main circuit power supply ON/OFF.
A SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.7A0:
Heat Sink Overheated
(Detected when the heat
sink temperature
exceeds 100
°C.)
The surrounding air temperature
is too high. Check the surrounding air tempera-
ture using a thermostat.
Decrease the surrounding air tem-
perature by improving the SERVO-
PACK installation conditions.
The overload alarm has been
reset by turning OFF the power
too many times. Check the alarm trace back monitor
(Fn000) to see if the overload alarm
was reported.
Change the method for resetting the
alarm.
Excessive load or operation
beyond the regenerative energy
processing capacity.
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.
Reconsider the load and operation
conditions.
Incorrect SERVOPACK installa-
tion orientation or/and insuffi-
cient space around the
SERVOPACK.
Check the SERVOPACK installa-
tion conditions. Install the SERVOPACK correctly
as specified.
A SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.7AB:
Built-in Fan in
SERVOPACK
Stopped
The fan inside the SERVOPACK
stopped. Check for foreign matter or debris
inside the SERVOPACK.
Remove foreign matter or debris
from the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
(cont’d)
Alarm:
Alarm Name
Cause Investigative Actions Corrective Actions