11 Inspection, Maintenance, and Troubleshooting
11.1.3 Troubleshooting of Alarm and Warning
11-10
A.86
Encoder
Overheated
(Only when an
absolute encoder
is connected.)
(Detected on the
encoder side.)
Occurred when the
control power sup-
ply was turned ON.
An encoder fault occurred. Replace the servomotor.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Occurred during
normal operation.
The surrounding air temperature around the servo-
motor is too high.
The surrounding air temperature must be 40°C or
less.
The servomotor load is greater than the rated load.
The servomotor load must be within the specified
range.
An encoder fault occurred. Replace the servomotor.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
A.b1
Reference
Speed Input
Read Error
(Detected when
the Servo is ON.)
Occurred when the
control power sup-
ply was turned ON.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Occurred during
normal operation.
A malfunction occurred in reading section of the
speed reference input.
Clear and reset the alarm and restart the opera-
tion.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
A.b2
Reference
Torque Input
Read Error
(Detected when
the servo is ON.)
Occurred when the
control power sup-
ply was turned ON.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
A malfunction occurred in the reading section of the
torque reference input.
Clear and reset the alarm and restart the opera-
tion.
Occurred during
normal operation.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
A.b3
Current Detec-
tion Error
Occurred when the
control power sup-
ply was turned ON.
The current sensor is faulty. Replace the SERVOPACK.
Occurred when the
servo was ON.
The current sensor is faulty. Replace the SERVOPACK.
The Servo ON command was input while the
servomotor was operating.
Check to be sure the servomotor has stopped,
and then input the Servo ON command.
The servomotor is disconnected. Correct the servomotor wiring.
Occurred during
normal operation.
The current sensor is faulty. Replace the SERVOPACK.
The servomotor was disconnected. Correct the servomotor wiring.
A.bF
System Alarm
(Program error)
• Software oper-
ation time
exceeded
• Stack overflow
• Micro program
error
Occurred when the
control power sup-
ply was turned ON.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Occurred during
normal operation.
A program is incorrect.
Replace the SERVOPACK. (Contact your
Yaskawa representative.)
A SERVOPACK board fault occurred. Replace the SERVOPACK.
A.C1
Servo Overrun
Detected
(Detected when
the servo is ON.)
Occurred when the
control power sup-
ply was turned ON.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Occurred when the
servo was ON or a
reference was input.
The order of phase U, V, and W in the servomotor
wiring is incorrect.
Correct the servomotor wiring.
An encoder fault occurred. Replace the servomotor.
A SERVOPACK fault occurred. Replace the SERVOPACK.
A.C8
Absolute
Encoder Clear
Error and Multi-
turn Limit Set-
ting Error
Occurred when the
control power sup-
ply was turned ON.
An encoder fault occurred. Replace the servomotor.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Occurred when an
encoder alarm was
cleared and reset.
An encoder fault occurred. Replace the servomotor.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Table 11.3 Alarm Display and Troubleshooting (Cont’d)
Alarm
Display
Alarm Name
Situation at Alarm
Occurrence
Cause Corrective Actions
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