YASKAWA Sigma-V Series User Manual page 370

10 Troubleshooting
10.1.2 Troubleshooting of Alarms
Alarm Number:
Alarm Name
(Alarm Description)
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
SERVOPACK's heat
sink temperature
exceeds 100°C.)
A.7AB:
Built-in Fan in
SERVOPACK
Stopped
A.810:
Encoder Backup Error
(Only when an absolute
encoder is connected.)
(Detected on the encoder
side.)
A.820:
Encoder Checksum
Error
(Detected on the encoder
side.)
10-14
Cause
The inrush current limit resistor
operation frequency at the main
circuit power supply ON/OFF
operation exceeds the allowable
range.
A fault occurred in the SERVO-
PACK or converter.
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 installation orientation
of the SERVOPACK or/and
insufficient space around the
SERVOPACK.
A fault occurred in the SERVO-
PACK.
The fan inside the SERVOPACK
stopped.
Alarm occurred when the power
to the absolute encoder was ini-
tially turned ON.
The encoder cable disconnected,
and connected again.
The power from both the control
power supply (+5 V) from the
SERVOPACK and the battery
power supply is not being sup-
plied.
An absolute encoder fault
occurred.
A fault occurred in the SERVO-
PACK.
An encoder fault occurred.
A fault occurred in the SERVO-
PACK.
Investigative Actions
−
−
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.
Check to see if the power was
turned ON initially.
Check to see if the power was
turned ON initially.
Check the encoder connector bat-
tery or the connector contact status.
−
−
−
−
(cont'd)
Corrective Actions
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.
Set up the encoder (Fn008).
Confirm the connection and set up
the encoder (Fn008).
Replace the battery or take similar
measures to supply power to the
encoder, and set up the encoder
(Fn008).
If the alarm cannot be reset by set-
ting up the encoder again, replace
the servomotor.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
• Absolute encoder
Set up the encoder again using
Fn008. If the alarm still occurs,
the servomotor may be faulty.
Replace the servomotor.
• Absolute encoder that shows val-
ues for a single rotation or incre-
mental encoder
The servomotor may be faulty.
Replace the servomotor.
The SERVOPACK may be faulty.
Replace the SERVOPACK.