10 Troubleshooting
10.2.1 List of Warnings
10-20
10.2 Warning Displays
The following sections describe troubleshooting in response to warning displays.
The warning name, warning meaning, and warning code output are listed in order of the warning numbers in
10.2.1 List of Warnings.
The causes of alarms and troubleshooting methods are provided in 10.2.2 Troubleshooting of Warnings.
10.2.1 List of Warnings
The relation between warning displays and warning code outputs are shown below.
Note 1. Warning code is not outputted without setting Pn001.3 =1 (Outputs both Alarm Codes and Warning Codes.)
2. If Pn008.2 = 1 (Do not detect warning) is selected, no warnings will be detected.
Warning
Display
Warning Name Meaning
Warning Code Output
ALO1 ALO2 ALO3
A.900
Position Error Pulse
Overflow
Position error pulse exceeded the parameter settings
(Pn520×Pn51E/100).
HHH
A.901
Position Error Pulse
Overflow Alarm at
Servo ON
When the servo turns ON, the position error pulses exceeded
the parameter setting (Pn526×Pn528/100).
HHH
A.910 Overload
This warning occurs before the overload alarms (A.710 or
A.720) occur. If the warning is ignored and operation contin-
ues, an overload alarm may occur.
LHH
A.911 Vibration
Abnormal vibration at the motor speed was detected. The
detection level is the same as A.520. Set whether to output an
alarm or warning by "Vibration Detection Switch" of Pn310.
LHH
A.920 Regenerative Overload
This warning occurs before the regenerative overload alarm
(A.320) occurs. If the warning is ignored and operation contin-
ues, a regenerative overload alarm may occur.
HLH
A.921
Dynamic Brake
Overload
This warning occurs before Dynamic Brake Overload (A.731)
alarm occurs. If the warning is ignored and operation contin-
ues, a dynamic brake overload alarm may occur.
HLH
A.930
Absolute Encoder
Battery Error
This warning occurs when the absolute encoder battery voltage
is lowered.
LLH
A.941
Change of Parameters
Requires Restart
Parameters that require the restart have been changed. H H L
A.971 Undervoltage
This warning occurs before Undervoltage (A.410) alarm
occurs. If the warning is ignored and operation continues, an
undervoltage alarm may occur.
LLL
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