YASKAWA SGDV series User Manual page 308

Alarm Number:
Alarm Name
(Alarm Description)
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
Alarm occurred when the power
to the absolute encoder was ini-
tially turned ON.
The encoder cable disconnected,
and connected again.
A.810:
The power from both the control
Encoder Backup Error
power supply (+5 V) from the
(Only when an absolute
SERVOPACK and the battery
encoder is connected.)
power supply is not being sup-
(Detected on the encoder
plied.
side.)
An absolute encoder fault
occurred.
A fault occurred in the SERVO-
PACK.
A.820:
An encoder fault occurred.
Encoder Checksum
Error
(Detected on the encoder
side.)
A fault occurred in the SERVO-
PACK.
Cause 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.
−
−
−
−
9.1 Alarm Displays
(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.
• Incremental encoder
The servomotor may be faulty.
Replace the servomotor.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
9
9-13