Troubleshooting Warnings - YASKAWA SGD7S series Product Manual

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.
Warning
A.911
A.923
A.930
A.942
A.971
A.9A0
A.9b0
4.1.6

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.
Warning Number:
Warning Name
A.900:
Position Deviation
Overflow
A.901:
Position Deviation
Overflow Alarm at
Servo ON
4.1 SERVOPACKs with Analog Voltage/Pulse Train References
Parameters That Must Be Set to Select Warning Detection
Pn310 = n.X (Vibration Detection Selection)
–
(Not affected by the setting of Pn008 = n.X.)
Pn008 = n.X (Low Battery Voltage Alarm/Warning Selection)
Pn423 = n.X (Speed Ripple Compensation Information Disagreement Warning Detec-
tion Selection)
Pn008 = n.X (Low Battery Voltage Alarm/Warning Selection)
(Not affected by the setting of Pn008 = n.X.)
Pn00D = n.X (Overtravel Warning Detection Selection)
(Not affected by the setting of Pn008 = n.X.)
Pn00F = n.X (Preventative Maintenance Warning Selection)
Possible Cause Confirmation
The Servomotor Check the wiring of the
U, V, and W wiring Servomotor's Main Cir-
is not correct. cuit Cables.
A SERVOPACK Check the SERVO-
gain is too low. PACK gains.
The frequency of Reduce the reference
the position refer- pulse frequency and try
ence pulse is too operating the SERVO-
high. PACK.
Reduce the reference
The acceleration
acceleration and try
of the position ref-
operating the SERVO-
erence is too high.
PACK.
The excessive
position deviation Check excessive posi-
alarm level (Pn520 tion deviation alarm
× Pn51E/100) is level (Pn520 × Pn51E/
too low for the 100) to see if it is set to
operating condi- an appropriate value.
tions.
A failure occurred
in the SERVO- –
PACK.
The position devi-
ation exceeded
the parameter set-
tings (Pn526 ×
–
Pn528/100) when
the servo was
turned ON.
4.1.6 Troubleshooting Warnings
Correction
Make sure that there are no
faulty connections in the
wiring for the Servomotor
and encoder.
Increase the servo gain,
e.g., by using autotuning
without a host reference.
Reduce the position refer-
ence pulse frequency or the
reference acceleration rate,
or reconsider the electronic
gear ratio.
Apply smoothing, i.e., by
using Pn216 (Position Ref-
erence Acceleration/ Decel-
eration Time Constant).
Optimize the settings of
Pn520 and Pn51E.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Set the position deviation to
be cleared while the servo is
OFF.
Optimize the setting of
Pn528 (Position Deviation
Overflow Warning Level at
Servo ON).
Continued on next page.
Reference
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