YASKAWA U1000 iQpump Drive, Technical Manual

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6.4 Fault Detection
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Fault Displays, Causes, and Possible Solutions
Faults are detected for drive protection, and cause the drive to stop while toggling the form-C output associated with terminals
MA-MB-MC. Remove the cause of the fault and manually clear the fault before attempting to run the drive again.
Table 6.14 Detailed Fault Displays, Causes, and Possible Solutions
Digital Operator Display Fault Name
Aov
Power Supply Overvoltage
The input power supply voltage became equal to or higher than the Input Power Supply Overvoltage
Detection Level.
200 V Class: Approximately 277 Vrms
400 V Class: Approximately 630 Vrms
Cause Possible Solution
• The power supply voltage exceeded the
range listed in drive input power
specifications.
• Regenerative operation was performed
when the power supply capacity was too
small.
• The power supply circuit opened during
regeneration.
• Reduce the voltage to within the range in the power supply specifications.
• Increase the capacity of the power supply.
Digital Operator Display Fault Name
AUv
Power Supply Undervoltage
The input power supply voltage became equal to or lower than the Input Power Supply Undervoltage
Detection Level (L2-21).
200 V Class: Approximately 150 Vrms
400 V Class: Approximately 300 Vrms
Cause Possible Solution
The capacity of the power supply is too small. Increase the capacity of the power supply.
The distortion in the power supply is too large. Lower the impedance of the input power supply wiring.
A phase loss occurred in the input power
supply.
Check the input power supply for phase loss or an imbalance in the interphase voltages. Investigate and
correct the cause and then reset the fault.
The built-in fuse is open.
An internal transistor was destroyed. The input wiring is grounded or short circuited.
The output transistor has failed because the drive output has grounded or short circuited.
Replace the board or the drive. For instructions on replacing the control board, contact Yaskawa or your
nearest sales representative.
Digital Operator Display Fault Name
bUS
Option Communication Error
• The connection was lost after establishing initial communication.
• Only detected when the run command frequency reference is assigned to an option card.
Cause Possible Solution
No signal was received from the PLC • Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits and repair as needed.
Faulty communications wiring or an existing
short circuit
Communication data error occurred due to
noise
• Check the various options available to minimize the effects of noise.
• Counteract noise in the control circuit, main circuit, and ground wiring.
• Ensure that other equipment such as switches or relays do not cause noise. Use surge absorbers if
necessary.
• Use only recommended cables or other shielded line. Ground the shield on the controller side or the
drive input power side.
• Separate all communication wiring from drive power lines. Install an EMC noise filter to the drive
power supply input.
The option card is damaged Replace the option card if there are no problems with the wiring and the error continues to occur.
The option card is not properly connected to
the drive
• The connector pins on the option card do not line up properly with the connector pins on the drive.
• Reinstall the option card.
6.4 Fault Detection
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual 367
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Troubleshooting