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9 Troubleshooting
9.1.2 Troubleshooting of Alarms
9-12
A.550:
Maximum Speed Set-
ting Error
The Pn385 setting is gr
eater than
the maximum speed.
Check the value of Pn385 and
Un01
0 (Monitor for allowable
motor maximum speed and encoder
output resolution).
Set Pn385 to a value equal to or
lower tha
n the motor maximum
speed.
A.710:
A.720:
Overload
A.710: High Load
A.720: Low Load
Incorrect wiring or contact fault
of servomotor and linear scale.
Check the wiring.
Confirm that the servomotor and
linear scale are correctly wired.
Operation beyond the overload
p
rotection characteristics.
Check the servomotor overload
char
acteristics and executed run
command.
Reconsider the load conditions and
operating conditions. Or, increase
the motor capacity.
Excessive load was applied dur-
ing operation because the servo-
motor was not driven due to
mechan
ical problems.
Check the executed operation refer-
ence and motor speed.
Remove the mechanical problems.
The setting of the linear scale
p
itch (Pn282) is incorrect.
Check the setting of Pn282. Correct the setting of Pn282.
The setting of the motor phase
selection
(Pn080.1) is incorrect.
Check the setting of Pn080.1. Correct the setting of Pn080.1.
A SERVOPACK fault occurred.
The SERVOPACK may be faulty.
Replace the
SERVOPACK.
A.730:
A.731:
Dynamic Brake Over-
load
(An excessive power
consumption of
dynamic
brake was detected.)
The servomotor moves because
of external force.
Check the operation status.
Take measures to ensure the servo-
motor will not move because of
external force.
The moving energy at a DB stop
exceeds the DB resistance capac-
ity.
Check the power consumed by DB
resistance (Un00B) to see how
many times the DB has been used.
Reconsider the following:
• Reduce the motor reference
spe
ed.
• Reduce the mass ratio.
• Reduce the number of times of
the DB stop operation.
A SERVOPACK fault occurred.
The SERVOPACK may be faulty.
Replace the
SERVOPACK.
A.740:
Overload of Surge
C
urrent Limit Resistor
(The main circuit power
is turned ON/OFF too
frequently
.)
The inrush current limit resistor
o
peration 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
s
ink temperature
exceeds 100C.)
The surrounding air temperature
is to
o 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
r
eset 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
ala
rm.
Excessive load or operation
beyond the regenerative energy
processing capacity.
Check the accumulated load ratio
(Un0
09) 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
conditio
ns.
Incorrect SERVOPACK installa-
tion orientation or/and insuffi-
cient space around the
SERVOPACK.
Check the SERVOPACK installa-
tion conditions.
Install the SERVOPACK correctly
as spe
cified.
A SERVOPACK fault occurred.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions
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