YASKAWA SGMSV - Page 312

9.1 Alarm Displays
9-13
9
Troubleshooting
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 history display
(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
(Un009) to see the load during oper-
ation, and the regenerative load
ratio (Un00A) to see the regenera-
tive energy processing capacity.
Reconsider the load and operating
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.
A.810:
Encoder Backup Error
(Only when an absolute
encoder is connected.)
(Detected on the encoder
side.)
Alarm occurred when the power
to the absolute encoder was ini-
tially turned ON.
Check to see if the power was
turned ON initially.
Set up the encoder (Fn008).
The encoder cable disconnected,
and connected again.
Check to see if the power was
turned ON initially.
Confirm the connection and set up
the encoder (Fn008).
The power from both the control
power supply (+5 V) from the
SERVOPACK and the battery
power supply is not being sup-
plied.
Check the encoder connector bat-
tery or the connector contact status.
Replace the battery or take similar
measures to supply power to the
encoder, and set up the encoder
(Fn008).
An absolute encoder fault
occurred.
−
If the
alarm cannot be reset by set-
ting up the encoder again, repl
ace
the servomotor.
A SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.820:
Encoder Checksum
Error
(Detected on the encoder
side.)
An encoder fault occurred. −
• Absolute encoder
Set up the encoder again using
Fn008. If the alarm still occurs,
the servomotor may be faulty.
Replace the servomotor.
• Single-turn absolute encoder or
incremental encoder
The servomotor may be faulty.
Replace the servomotor.
A SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
(cont’d)
Alarm Number:
Alarm Name
Cause Investigative Actions Corrective Actions