YASKAWA E-V Series User Manual page 217

Alarm:
Alarm Name
The surrounding air temperature
is too high.
The overload alarm has been
reset by turning OFF the power
too many times.
A.7A0:
Excessive load or operation
Heat Sink Overheated
beyond the regenerative energy
(Detected when the heat
processing capacity.
sink temperature
exceeds 100°C.)
Incorrect SERVOPACK installa-
tion orientation or/and insuffi-
cient space around the
SERVOPACK.
A SERVOPACK fault occurred.
A.7AB:
Built-in Fan in The fan inside the SERVOPACK
SERVOPACK stopped.
Stopped
A.820:
A linear scale fault occurred.
Encoder Checksum
Error
A SERVOPACK fault occurred.
(Detected on the encoder
side.)
A linear scale fault occurred.
A.840:
Encoder Data Error
(Detected on the encoder
side.)
Malfunction of linear scale
because of noise interference, etc.
The servomotor speed is higher
than the specified speed, when
the control power supply was
turned ON.
A.850:
Encoder Overspeed
(Detected when the con-
trol power supply was An encoder fault occurred.
turned OFF and then ON
again.)
(Detected on the encoder
side.)
A SERVOPACK fault occurred.
Cause Investigative Actions
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.
−
−
−
−
Check the speed monitor (Un000)
to confirm the servomotor speed
when the power is turned ON.
−
−
8.1 Troubleshooting
Corrective Actions
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.
Repair or replace the SERVO-
PACK.
Remove foreign matter or debris
from the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Repair or
replace the SERVOPACK.
The linear scale may be faulty.
Repair or replace the linear scale.
The SERVOPACK may be faulty.
Repair or replace the SERVO-
PACK.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear scale may be
faulty. Repair or replace the linear
scale.
Correct the wiring around the linear
scale by separating the encoder
cable from the main circuit cable or
by checking the grounding and
other wiring.
Reduce the motor speed to a value
below the speed specified by the
linear scale manufacturer, and turn
ON the control power supply.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Repair or replace the servo-
motor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Repair or replace the SER-
VOPACK.
8
8-13