11-12
11-4 Troubleshooting
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
11
Troubleshooting and Maintenance
13
0
Main power supply
undervoltage
(insufficient voltage
between P and N)
If the Undervoltage Error Selection
(Pn508) is set to 1, a momentary
power interruption occurred between
L1 and L3 for longer than the value
specified for the Momentary Hold
Time (Pn509). Or, the voltage
between the positive and negative
terminals in the control power supply
converter dropped below the
specified value while the Servo was
ON.
100-V models: Approx. 80 VDC
(approx. 55 VAC)
200-V models: Approx. 110 VDC
(approx. 75 VAC)
400-V models: Approx. 180 VDC
(approx. 125 VAC)
· 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.
· Phase loss: A Servo Drive with 3-
phase input specification was
operated with a single-phase
power supply.
· The Servo Drive has failed (circuit
failure).
Measure the voltage between the L1,
L2, and L3 lines on the connector and
the terminal block.
· Increase the power supply voltage
capacity. Change the power
supply.
· Eliminate the cause of the failure
of the electromagnetic contactor
on the main circuit power supply,
and then turn ON the power again.
· Check the setting of the
Momentary Hold Time (Pn509).
Correctly set the phases of the
power supply.
· Increase the power supply
capacity. Refer to Servo Drive and
Servomotor Combination Tables
on page 2-11 for information on
the power supply capacity.
· Connect the phases (L1, L2, L3) of
the power supply correctly. Use L1
and L3 for single-phase 100 V and
single-phase 200 V.
· Replace the Servo Drive.
1
Main power supply
undervoltage (AC cut-
off detection)
Alarm
number
Name Cause Measures
Main Sub
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