9 Troubleshooting
9.1.1 List of Alarms
9-4
A.860
Encoder Overheated
The internal temperature of encoder is too
high.
Gr.1 N/A H H H
A.b10
Speed Reference A/D
Error
The A/D converter for speed reference
input is faulty.
Gr.2 Available H H H
A.b11
Speed Reference A/D
Data Error
A/D conversion data of speed reference
input is incorrect.
Gr.2 Available H H H
A.b20
Reference Torque
Input Read Error
The A/D converter for torque reference
input is faulty.
Gr.2 Available H H H
A.b31*
Current Detection Error 1
The current detection circuit for phase U is
faulty.
Gr.1 N/A H H H
A.b32*
Current Detection Error 2
The current detection circuit for phase V is
faulty.
Gr.1 N/A H H H
A.b33*
Current Detection Error 3
The detection circuit for the current is
faulty.
Gr.1 N/A H H H
A.bF0
System Alarm 0
Internal program error 0 occurred. Gr.1 N/A H H H
A.bF1
System Alarm 1
Internal program error 1 occurred. Gr.1 N/A H H H
A.bF2
System Alarm 2
Internal program error 2 occurred. Gr.1 N/A H H H
A.bF3
System Alarm 3
Internal program error 3 occurred. Gr.1 N/A H H H
A.bF4
System Alarm 4
Internal program error 4 occurred. Gr.1 N/A H H H
A.C10
Servo Overrun Detected
The servomotor ran out of control. Gr.1 Available L H L
A.C80
Absolute Encoder Clear
Error and Multiturn Limit
Setting Error
The multiturn for the absolute encoder was
not properly cleared or set.
Gr.1 N/A L H L
A.C90
Encoder Communications
Error
Communications between the multi-wind-
ing drive unit and the encoder are not pos-
sible.
Gr.1 N/A L H L
A.C91
Encoder Communications
Position Data Error
An encoder position data calculation error
occurred.
Gr.1 N/A L H L
A.C92
Encoder Communications
Timer Error
An error occurred in the communications
timer between the encoder and the multi-
winding drive unit.
Gr.1 N/A L H L
A.CA0
Encoder Parameter Error
Encoder parameters are faulty. Gr.1 N/A L H L
A.Cb0
Encoder Echoback Error
Contents of communications with encoder
are incorrect.
Gr.1 N/A L H L
A.CC0
Multiturn Limit
Disagreement
Different multiturn limits have been set in
the encoder and the multi-winding drive
unit.
Gr.1 N/A L H L
A.d00
Position Error Overflow
Position error exceeded the value of exces-
sive position error alarm level (Pn520)
when the servomotor power is ON.
Gr.1 Available L L H
A.d01
Position Error Overflow
Alarm at Servo ON
This alarm occurs if the servomotor power
is turned ON when the position error is
greater than the set value of Pn526 while
the servomotor power is OFF.
Gr.1 Available L L H
A.d02
Position Error Overflow
Alarm by Speed Limit at
Servo ON
When the position errors remain in the
error counter, Pn529 limits the speed if the
servomotor power is turned ON. If Pn529
limits the speed in such a state, this alarm
occurs when reference pulses are input and
the number of position errors exceeds the
value set for the excessive position error
alarm level (Pn520).
Gr.2 Available L L H
A.Eb1*
Safety Function Signal
Input Timing Error
The safety function signal input timing is
faulty.
Gr.1 N/A H L L
(cont’d)
Alarm
Number
Alarm Name Meaning
Servomotor
Stopping
Method
Alarm
Reset
Alarm Code Output
ALO1 ALO2 ALO3
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