8-7
8-3 Troubleshooting
Troubleshooting
8
8-3 Troubleshooting
If an error occurs in the machine, determine the error conditions from the alarm indicator and
operating status, identify the cause of the error, and take appropriate countermeasures.
Error Diagnosis Using the Displayed Alarm Codes
Alarm
code
Alarm Name Cause Countermeasure
11
Control power supply
undervoltage
The voltage between P and N in the
control voltage converter has dropped
below the specified value.
1 The power supply voltage is low. A
momentary power failure occurred.
2 The power supply capacity is
insufficient. The inrush current at
power-ON caused the power
supply voltage to drop.
3 The Servo Drive has failed.
Measure the line voltage between
control power supply L1C and L2C.
1 Resolve the cause of the power
supply voltage drop and/or
momentary power failure.
2 Increase the power supply
capacity.
3 Replace the Servo Drive.
12 Overvoltage
The voltage between P and N in the
main circuit has exceeded the speci-
fied value. The power supply voltage is
too high. Phase advance capacitor
and/or UPS (uninterruptible power
supply) is causing a jump in voltage.
1 Regenerative energy cannot be
absorbed due to a disconnection of
the regeneration resistor.
2 Regenerative energy cannot be
absorbed due to the use of an
inappropriate external regeneration
resistor.
3 The Servo Drive has failed.
Measure and check the line voltages
between L1, L2, and L3 of the main
power supply. Input a correct voltage.
Remove the phase advance capacitor.
1 Measure the resistance for the
external regeneration resistor
between terminals B1 and B2 of the
Servo Drive, and check that the
reading is normal. Replace it if
disconnected.
2 Provide the necessary
regeneration resistance and
wattage.
3 Replace the Servo Drive.
13
Main power supply
undervoltage
With the Undervoltage Alarm Selection
(Pn065) set to 1, the main power
supply between L1 and L3 was
interrupted for longer than the time set
by Momentary Hold Time (Pn06D).
Alternatively, the voltage between P
and N in the main circuit dropped
below the specified value while the
Servo Drive was ON.
1 The power supply voltage is low.
2 A momentary power failure
occurred.
3 The power supply capacity is insuf-
ficient - The inrush current at
power-ON caused the power
supply voltage to drop.
4 Missing phase - A single-phase
power supply was used for a three-
phase Servo Drive.
5 The Servo Drive has failed.
Measure and check the line voltages
between L1, L2, and L3 of the main
power supply.
1 Resolve the cause of the power
supply voltage drop and/or
momentary power failure.
2 Check the setting for the
Momentary Hold Time (Pn06D).
3 Increase the power supply
capacity. Refer to the Servo Drive
specifications for the power supply
capacity.
4 Correctly connect the phases (L1,
L2, and L3) of the power supply.
Connect single-phase 100 V and
single-phase 200 V to L1 and L3.
5 Replace the Servo Drive.
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