YASKAWA UAK series User Manual page 284

11 Inspection, Maintenance, and Troubleshooting
11.2.3 Troubleshooting of the Servo Drive Alarms
Alarm:
Alarm Name
A.D02:
Position Error Pulse
Overflow Alarm by
Speed Limit at Servo
ON
A.D10:
Motor-load Position
Error Overflow
A.E00:
System Alarm 5
A.E02:
System Alarm 6
A.E03:
System Alarm 7
A.E61:
System Alarm 8
A.EB1:
HWBB Function
Signal Input Timing
Error
A.EEA:
Converter Local Bus
WD Error
(A power regeneration
converter local bus WD
alarm occurred.)
11-30
Cause
After a position error pulse has
been input, Pn529 limits the
speed if the SV_ON command is
received. If Pn529 limits the
speed in such a state, this alarm
occurs when the position refer-
ences are input and the number of
position error pulses exceeds the
value set for parameter Pn520
(Excessive Position Error Alarm
Level).
Motor rotation direction and
external encoder installation
direction are opposite.
Mounting of the load (e.g., stage)
and external encoder joint instal-
lation are incorrect.
SERVOPACK failure
A setting on the DIP switch (S3)
was changed.
SERVOPACK failure
The lag between activations of
the input signals /HWBB1 and
/HWBB2 for the HWBB function
is 10 second or more.
The local bus cable of the power
regeneration converter is either
disconnected or a has a contact
fault.
Malfunction caused by noise
The terminator circuit inside the
power regeneration converter has
failed.
Investigative Actions
–
Check the servomotor rotation
direction and the external encoder
installation direction.
Check the external encoder
mechanical connection.
–
Check the DIP switch settings.
−
Measure the time lag between the
/HWBB1 and /HWBB2 signals.
Check the local bus cable.
Improve the noise environment,
including the wiring and installa-
tion, and check to see if the alarm
occurs again.
−
(cont'd)
Corrective Actions
Correct the excessive position error
alarm level (Pn520).
Or, adjust the speed limit level at
servo turns ON (Pn529).
Install the external encoder in the
opposite direction, or change the
setting of the external encoder
usage method (Pn002.3) to reverse
the direction.
Check the mechanical joints.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Turn OFF all pins on the DIP switch
(S3).
The SERVOPACK may be faulty.
Replace the SERVOPACK.
The output signal circuits or devices
for /HWBB1 and /HWBB2
or the SERVOPACK input signal
circuits may be faulty. Alterna-
tively, the input signal cables may
be disconnected. Repair or replace
them.
Either re-install the local bus cable
or replace it.
Install the local bus cable away
from the peripheral equipment, or
replace it with a cable that has a fer-
rite core.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the power regeneration con-
verter may be faulty. Replace the
power regeneration converter.