12 Troubleshooting
12 - 22
AC Servomotors/Servo Drives 1S-series with Built-in EtherCAT® Communications User’s Manual (I586)
18 02 Regenera-
tion Process-
ing Error
The regeneration pro-
cessing was stopped to
protect the Regenera-
tion Resistor.
This error occurs when
the regeneration pro-
cessing continues for
500 ms or more.
The Regeneration
Resistor is selected
inappropriately.
Check the operation pattern by the
velocity monitor. Check the load
ratio of Regeneration Resistor, and
perform the following corrections
accordingly.
• Increase the deceleration time
and stopping time.
• Decrease the command velocity
to the motor.
• Use an External Regeneration
Resistor.
• Increase the capacities of the
Servo Drive and the motor.
The Regeneration
Resistor is used for con-
tinuous regenerative
braking.
The Regeneration Resistor cannot
be used for continuous regenera-
tive braking.
The applied power sup-
ply voltage is higher
than the specified value.
Apply the specified power supply
voltage.
Regeneration Resistor
failure
Check whether the Regeneration
Resistor is faulty, and use one with-
out failures.
20 00 Runaway
Detected
*3
The motor rotated in the
direction opposite to the
command.
There is incorrect wir-
ing of the motor cable or
a broken cable.
Connect the motor cable as shown
in the wiring diagram. If the cable is
broken, replace it.
Or, connect the motor cable and
encoder cable that are used
together to the same motor.
The motor rotated in the
direction opposite to the
command by external
forces.
Take countermeasures so that the
motor is not subjected to external
forces.
Set Runaway Detection - Enable
(3B71-01 hex) to 0 (disabled) when
the motor runs as intended.
21 00 Encoder
Communica-
tions Discon-
nection Error
The communications
disconnection was
detected between the
encoder and the Servo
Drive.
This error is detected if
the encoder communi-
cations timeout occurs
four times in a row.
Noise into the encoder
cable
• Separate the motor cable and the
encoder cable if they are bundled
together.
• Connect the shield to FG.
• Confirm that the motor ground
wire is connected to FG.
Contact failure of the
signal line, and discon-
nection of the encoder
Replace the encoder cable if it is
broken. Firmly connect the encoder
connector to the Servo Drive.
Power supply undervolt-
age to the encoder
Use the recommended encoder
cable.
Encoder failure If this event occurs after you per-
formed all corrections shown
above, replace the motor.
Error No.
Name Cause Measures
Main
(hex)
Sub
(hex)
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