11-15
11-4 Troubleshooting
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
11
Troubleshooting 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 voltage
between P and N of the converter,
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 CX-
Drive. 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 check for 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 install a thermal switch when setting the
Regeneration Resistor Selection (Pn016) to 2. Otherwise,
the Regeneration Resistor will not be protected, may
generate excessive heat, and may 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 of 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 encoder cable
correctly.
Alarm
number
Name Cause Measures
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