5.2 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 5.2 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
AUXFB
PI Aux Lvl Loss
Wire-break detection for PI Aux Feedback Level
Cause Possible Solution
The analog input programmed for “PI Aux
FB Level” (H3-oo = 27) has dropped
below 3 mA or risen above 21 mA for
longer than 1 second.
Repair transducer or wiring.
HOA Keypad Display Fault Name
bAT Digital Operator Battery Voltage Low
Cause Possible Solution
The digital operator battery is low Replace the digital operator battery.
HOA Keypad Display Fault Name
boL
Braking Transistor Overload Fault
The braking transistor reached its overload level.
Cause Possible Solution
The wrong braking resistor is installed Select the correct braking resistor.
HOA Keypad 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
5.2 Fault Detection
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
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5
Troubleshooting
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