9 Troubleshooting
9.1.2 Troubleshooting of Alarms
9-18
A.d00:
Position Error
Overflow
(Position error exceeded
the value set in the
excessive position error
alarm level (Pn520).)
The servomotor U, V, and W wir-
ings is faulty.
Check the servomotor main circuit
cable connection.
Confirm that there is no contact
fault in the motor wiring or encoder
wiring.
The frequency of the position ref-
erence pulse is too high.
Reduce the reference pulse fre-
quency, and operate the multi-wind-
ing drive unit.
Reduce the position reference pulse
frequency or acceleration of posi-
tion reference. Or, reconsider the
electronic gear ratio.
The acceleration of the position
reference is too high.
Reduce the reference acceleration,
and operate the multi-winding drive
unit.
Apply the smoothing function, such
as using position reference accelera-
tion/deceleration time constant
(Pn216).
Setting of the excessive position
error alarm level (Pn520) is low
against the operating condition.
Check the alarm level (Pn520) to
see if it is set to an appropriate
value.
Set the Pn520 to proper value.
A fault occurred in the multi-
winding drive unit.
−
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the multi-winding drive unit
may be faulty. Replace the multi-
winding drive unit.
A.d01:
Position Error
Overflow Alarm at
Servo ON
This alarm occurs if the servomo-
tor power is turned ON when the
position error is greater than the
set value of Pn526 while the ser-
vomotor power is OFF.
Check the position error amount
(Un008) while the servomotor
power is OFF.
Set position error to be cleared
while the servomotor power is OFF.
Or, correct the excessive position
error alarm level at servo ON
(Pn526).
A.d02:
Position Error
Overflow Alarm by
Speed Limit at Servo
ON
When the position errors remain
in the error counter, Pn529 limits
the speed if the servomotor power
is ON. If Pn529 limits the speed
in such a state, this alarm occurs
when reference pulses are input
and the number of position errors
exceeds the value set for the
excessive position error alarm
level (Pn520).
−
Set position error to be cleared
while the servomotor power is OFF.
Or, correct the excessive position
error alarm level (Pn520).
Or, adjust the speed limit level at
servo ON (Pn529).
A.d10:
Motor-load Position
Error Overflow
Motor rotation direction and
external encoder installation
direction are opposite.
Check the servomotor rotation
direction and the external encoder
installation direction.
Install the external encoder in the
opposite direction, or change the
setting of the external encoder
usage method (Pn002.3) to reverse
the direction.
Mounting of the load (e.g., stage)
and external encoder joint instal-
lation are incorrect.
Check the external encoder
mechanical connection.
Check the mechanical joints.
A.Eb1:
Safety Function Signal
Input Timing Error
The lag between activations of
the input signals /HWBB1 and
/HWBB2 for the HWBB function
is ten second or more.
Measure the time lag between the /
HWBB1 and
/HWBB2 signals.
The output signal circuits or devices
for /HWBB1 and
/HWBB2 or the multi-winding
drive unit input signal circuits may
be faulty. Alternatively, the input
signal cables may be disconnected.
Check if any of these items are
faulty or have been disconnected.
A.EE0:
Local Communica-
tions Servo OFF Oper-
ation Error 1
The servo was not turned OFF for
all axes within 1 second after the
servo OFF request.
−
Perform an alarm reset and restart
operation.
A.EE1:
Local Communica-
tions Servo ON Oper-
ation Error 1
The servo was not turned ON for
all axes within 1 second after the
servo ON request.
Check to see if the multi-winding
drive unit is in ready status.
Perform an alarm reset and restart
operation.
Check to see if the motor is stopped. Perform an alarm reset and restart
operation.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause
Investigative Actions
Corrective Actions