YASKAWA Sigma-7 Series Product Manual page 105

Alarm Number:
Possible Cause
Alarm Name
The allowable fre-
A.740:
quency of the inrush
Inrush Current
current limiting resis-
Limiting Resistor
tor was exceeded
Overload
when the main circuit
(The main circuit
power supply was
power supply
turned ON and OFF.
was frequently
turned ON and
A failure occurred in
OFF.)
the SERVOPACK.
The surrounding air
temperature is too
high.
An overload alarm
was reset by turning
OFF the power sup-
ply too many times.
A.7A1:
There was an exces-
Internal Tempera-
sive load or operation
ture Error 1
was performed that
(Control Board
exceeded the regen-
Temperature
erative processing
Error)
capacity.
The SERVOPACK
installation orientation
is not correct or there
is insufficient space
around the SERVO-
PACK.
A failure occurred in
the SERVOPACK.
Confirmation
Reduce the frequency of
turning the main circuit
–
power supply ON and
OFF.
The SERVOPACK may be
– faulty. Replace the
SERVOPACK.
Check the surrounding
air temperature using a Decrease the surround-
thermometer. Or, check ing temperature by
the operating status improving the SERVO-
with the SERVOPACK PACK installation condi-
installation environment tions.
monitor.
Check the alarm display
Change the method for
to see if there is an
resetting the alarm.
overload alarm.
Use the accumulated
load ratio to check the
load during operation,
Reconsider the load and
and use the regenera-
operating conditions.
tive load ratio to check
the regenerative pro-
cessing capacity.
Install the SERVOPACK
Check the SERVOPACK
according to specifica-
installation conditions.
tions.
The SERVOPACK may be
faulty. Replace the
–
SERVOPACK.
6.1 Alarm Displays
6.1.2 Troubleshooting Alarms
Continued from previous page.
Correction Reference
–
–
*1
–
–
*1
–
Continued on next page.
6
6-17