5.3 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 triggering the fault output terminal MA-MB-MC.
Remove the cause of the fault and manually clear the fault before attempting to run the drive again.
Table 5.4 Detailed Fault Displays, Causes, and Possible Solutions
HOA Keypad Display
Fault Name
ACCUM
Accum Level
Accumulated Level Fault
The total volume of water flow measured over time by the flow meter has exceeded the fault level setting.
Cause
Possible Solution
The accumulated level has exceeded the
values set in P6-11 to P6-14. This is only
effective when P6-15, Accumulated
Behavior is set to 2 (fault with manual
monitor reset) or 3 (fault with automatic
monitor reset.
Set the Accumulated Level fault characteristics in P6-11 to P6-14 and P6-16.
Drive response to this condition is controlled by P6-15, Accumulated Behavior.
Auto-restart of this fault is controlled by P6-15, Accumulated Behavior and P6-05, Flow Accumulation Reset.
HOA Keypad Display
Fault Name
AJF
Anti-Jam Fault
Anti-Jam Fault
Cause
Possible Solution
The drive was not able to clear debris from
the impeller in fewer than the number of
attempts set in P7-02. This is only effective
when P7-01, Anti-jam Operation is set to 1
(enabled).
• Check for proper pump operation. Remove debris from the pump impeller.
• Set the Anti-jam fault characteristics in P7-02 to P7-08.
• Drive response to this condition is controlled by P7-01, Anti-jam Operation Selection.
HOA Keypad 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.
HOA Keypad 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.
5.3 Fault Detection
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual
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5
Troubleshooting
