12-13
12-4 Troubleshooting
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
12
Troubleshooting and Maintenance
12-4 Troubleshooting
If an error occurs in the machine, determine the error conditions from the error displays and
operation state, identify the cause of the error, and take appropriate measures.
Troubleshooting with Error Displays
Error List
Error No. (hex)
Name Cause Measures
Main Sub
11 0
Control
Power Supply
Undervoltage
The voltage between the positive and
negative terminals in the control power
supply converter dropped below the
specified value.
• The power supply voltage is low. A
momentary power interruption occurred.
• Insufficient power supply capacity: the
power supply voltage dropped because
there was inrush current when the main
power supply was turned ON.
• The Servo Drive is faulty (circuit fault).
Measure the voltage between the L1C
and L2C lines on the connectors and the
terminal block.
• Increase the power supply voltage.
Change the power supply.
• Increase the power supply capacity.
• Replace the Servo Drive.
12 0
Overvoltage The power supply voltage exceeded the
allowable input voltage range, causing the
voltage between the positive and negative
terminals in the converter to exceed the
specified value. The power supply voltage
is high. The voltage was suddenly
increased by the phase advance capacitor
or the uninterruptible power supply (UPS).
• The Regeneration Resistor wiring is
broken.
• The External Regeneration Resistor is
inappropriate and cannot absorb all of
the regenerative energy. The load
inertia is too large, gravitational torque
on the vertical axis is too large, or there
is some other problem to absorb the
regenerative energy.
• The Servo Drive is faulty (circuit fault).
Measure the voltage between the
connector (L1, L2, and L3) lines. Input the
correct voltage. Remove the phase
advance capacitor.
• Use a tester to measure the resistance
of the external resistor between the B1
and B2 terminals on the Servo Drive. If
the resistance is infinite, the wiring is
broken. Replace the external resistor.
• Change the regeneration resistance and
wattage to the specified values.
(Calculate the regenerative energy and
connect an External Regeneration
Resistor with the required regeneration
absorption capacity. Reduce the
descent speed.)
• Replace the Servo Drive.
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