11-14
11-4 Troubleshooting
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
11
Error and Maintenance
11-4 Troubleshooting
If an error occurs in the machine, determine the error conditions from the alarm displays and
operation status, identify the cause of the error, and take appropriate measures.
Error Diagnosis Using the Alarm Displays
Alarm
number
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.
100-V products: Approx. 70 VDC
(Approx. 50 VAC)
200-V products: Approx. 145 VDC
(Approx. 100 VAC)
400-V products: Approx. 15 VDC
•
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).
100-V products: Approx. 200 VDC
(Approx. 140 VAC)
200-V products: Approx. 400 VDC
(Approx. 280 VAC)
400-V products: Approx. 800 VDC
(Approx. 560 VAC)
• 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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