11-18
11-4 Troubleshooting
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
11
Error and Maintenance
18
0 Regeneration overload
The regenerative energy exceeds the
processing capacity of the
Regeneration Resistor.
• The regenerative energy during
deceleration caused by a large
load inertia increased the converter
voltage, and then insufficient
energy absorption by the
Regeneration Resistor further
increased the voltage.
• The Servomotor rotation speed is
too high to absorb the regenerative
energy within the specified
deceleration time.
• The operating limit of the external
resistor is limited to a 10% duty.
Check the load rate of the
Regeneration Resistor through
communications. This Regeneration
Resistor cannot be used for
continuous regenerative braking.
• Check the operation pattern
(speed monitor). Check the load
rate of the Regeneration Resistor
and check for the excessive
regeneration warning display.
Increase the capacities of the
Servo Drive and the Servomotor,
and lengthen the deceleration time.
Use an External Regeneration
Resistor.
• Check the operation pattern
(speed monitor). Check the load
rate of the Regeneration Resistor
and the excessive regeneration
warning display. Increase the
capacities of the Servo Drive and
the Servomotor, and lengthen the
deceleration time. Reduce the
Servomotor rotation speed. Use an
External Regeneration Resistor.
• Set the Regeneration Resistor
Selection (Pn016) to 2.
Precautions for Correct Use
Always provide a temperature fuse or other protective measure when setting
the Regeneration Resistor Selection (Pn016) to 2. Otherwise, the
Regeneration Resistor will not be protected, generate excessive heat, and be
burnt.
1 Regeneration Tr error
The Servo Drive regeneration drive Tr
is faulty.
Replace the Servo Drive.
21
0
Encoder
communications
disconnection error
A disconnection was detected
because communications between
the encoder and the Servo Drive were
stopped more frequently than the
specified value.
Wire the encoder correctly as shown
in the wiring diagram. Correct the
connector pin connections.
1
Encoder
communications error
There was a communications error in
data from the encoder. There was a
data error mainly due to noise. The
encode cable is connected, but a
communications data error occurred.
• Provide the required encoder
power supply voltage 5 VDC 5%
(4.75 to 5.25 V). Be careful
especially when the encode cable
is long.
• If the Servomotor cable and the
encoder cable are bundled
together, separate them.
• Connect the shield to FG.
23 0
Encoder
communications data
error
No communications error occurred
with the data from the encoder, but
there is an error in the contents of the
data. There was a data error mainly
due to noise. The encode cable is
connected, but a communications
data error occurred.
• Provide the required encoder
power supply voltage 5 VDC 5%
(4.75 to 5.25 V). Be careful
especially when the encode cable
is long.
• If the Servomotor cable and the
encoder cable are bundled
together, separate them.
• Connect the shield to FG.
Alarm
number
Name Cause Measures
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