3.1 FT82 SERVOPACKs with Analog Voltage/Pulse Train References
3.1.6 Troubleshooting Warnings
3
Maintenance
3-35
Note: 1. A warning code is not output unless you set Pn001 to n.1
(Output both alarm codes and warning
codes).
2. Use Pn008 = n.
X
(Warning Detection Selection) to control warning detection.
However, the following warnings are not affected by the setting of Pn008 = n.
X
and other parameter
settings are required in addition to Pn008 = n.
X
.
3.1.6
Troubleshooting Warnings
The causes of and corrections for the warnings are given in the following table. Contact your
Yaskawa representative if you cannot solve a problem with the correction given in the table.
A.9b0
Preventative Mainte-
nance Warning
One of the consumable parts has reached the end
of its service life.
H
L
H
Warning
Parameters That Must Be Set to Select Warning Detection
A.911
Pn310 = n.
X (Vibration Detection Setting)
A.923
–
(Not affected by the setting of Pn008 = n.
X
.)
A.930
Pn008 = n.
X (Low Battery Voltage Alarm/Warning Selection)
A.942
Pn423 = n.
X
(Speed Ripple Compensation Information Disagreement Warning
Detection Selection)
A.971
Pn008 = n.
X (Low Battery Voltage Alarm/Warning Selection)
(Not affected by the setting of Pn008 = n.
X
.)
A.9A0
Pn00D = n.X
(Overtravel Warning Detection Selection)
(Not affected by the setting of Pn008 = n.
X
.)
A.9b0
Pn00F = n.
X (Preventative Maintenance Selection)
Continued from previous page.
Warning
Number
Warning Name
Meaning
Warning Code
Output
ALO1 ALO2 ALO3
Warning Number:
Warning Name
Possible Cause
Confirmation
Correction
Reference
A.900:
Position Deviation
Overflow
The Servomotor
U, V, and W wiring
is not correct.
Check the wiring of the
Servomotor’s Main Cir-
cuit Cables.
Make sure that there are no
faulty connections in the
wiring for the Servomotor
and encoder.
–
A SERVOPACK
gain is too low.
Check the SERVO-
PACK gains.
Increase the servo gain,
e.g., by using autotuning
without a host reference.
*
The frequency of
the position refer-
ence pulse is too
high.
Reduce the reference
pulse frequency and try
operating the SERVO-
PACK.
Reduce the position refer-
ence pulse frequency or the
reference acceleration rate,
or reconsider the electronic
gear ratio.
*
The acceleration
of the position ref-
erence is too high.
Reduce the reference
acceleration and try
operating the SERVO-
PACK.
Apply smoothing, i.e., by
using Pn216 (Position Ref-
erence Acceleration/ Decel-
eration Time Constant).
*
The excessive
position deviation
alarm level (Pn520
×
Pn51E/100) is
too low for the
operating condi-
tions.
Check excessive posi-
tion deviation alarm
level (Pn520
×
Pn51E/
100) to see if it is set to
an appropriate value.
Optimize the settings of
Pn520 and Pn51E.
*
A failure occurred
in the SERVO-
PACK.
–
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 on next page.
