YASKAWA SGD7S Product Manual page 477

14.2 Alarm Displays
14.2.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.CF1:
Reception Failed
Error in Feed-
back Option
Module Commu-
nications
A.CF2:
Timer Stopped
Error in Feed-
back Option
Module Commu-
nications
A.d00:
Position Devia-
tion Overflow
(The setting of
Pn520 (Exces-
sive Position
Deviation Alarm
Level) was
exceeded by the
position devia-
tion while the
servo was ON.)
14-36
Possible Cause
The cable between
the Serial Converter
Unit and SERVOPACK Check the wiring of the
is not wired correctly external encoder.
or there is a faulty
contact.
A specified cable is
not being used Check the wiring speci-
between Serial Con- fications of the external
verter Unit and SER- encoder.
VOPACK.
The cable between Measure the length of
the Serial Converter the cable that connects
Unit and SERVOPACK the Serial Converter
is too long. Unit.
The sheath on cable
between the Serial Check the cable that
Converter Unit and connects the Serial
SERVOPACK is bro- Converter Unit.
ken.
Noise entered the
cable between the
–
Serial Converter Unit
and SERVOPACK.
A failure occurred in
the Serial Converter –
Unit.
A failure occurred in
–
the SERVOPACK.
The Servomotor U, V, Check the wiring of the
and W wiring is not Servomotor's Main Cir-
correct. cuit Cables.
Reduce the position
The position com-
command speed and
mand speed is too
try operating the SER-
fast.
VOPACK.
Reduce the reference
The acceleration of
acceleration and try
the position reference
operating the SERVO-
is too high.
PACK.
The setting of Pn520 Check Pn520 (Exces-
(Excessive Position sive Position Deviation
Deviation Alarm Level) Alarm Level) to see if it
is too low for the is set to an appropriate
operating conditions. value.
A failure occurred in
–
the SERVOPACK.
Confirmation
Correctly wire the cable
between the Serial Con-
verter Unit and SERVO-
PACK.
Use a specified cable.
The length of the cable
between the Serial Con-
verter Unit and SERVO-
PACK must be 20 m or
less.
Replace the cable
between the Serial Con-
verter Unit and SERVO-
PACK.
Correct the wiring around
the Serial Converter Unit,
e.g., separate I/O signal
lines from the Main Circuit
Cables or ground.
Replace the Serial Con-
verter Unit.
Replace the SERVO-
PACK.
Make sure that there are
no faulty contacts in the
wiring for the Servomotor
and encoder.
Reduce the position refer-
ence speed or the refer-
ence acceleration rate, or
reconsider the electronic
gear ratio.
Reduce the settings of
PnB2A (Acceleration
Rate) and PnB2B (Decel-
eration Rate) to reduce
the acceleration rate for
positioning references.
Optimize the setting of
Pn520.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Continued from previous page.
Correction Reference
page 4-27
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page 5-41
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page 8-7
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Continued on next page.