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HOA Keypad Display
Minor Fault Name
The feedback level has risen above the level
set in P1-11, High Feedback Level
This is only effective when P1-13, High
Feedback Selection, is set to 1 (Alarm and
digital out).
• Decrease the feedback signal.
• Set the High Feedback alarm characteristics in P1-11 and P-12.
• Drive response to this condition is controlled by P1-13, High Feedback Selection.
HOA Keypad Display
Minor Fault Name
HISUC
High Suction
High Section Pressure
Cause
Possible Solution
The suction pressure has fallen below the
level set in Q5-12. This is only effective
when Q5-14, High Suction Pressure
Behavior Select is set to 1 (alarm).
• Reduce the system pressure.
• Set the High Suction Pressure alarm characteristics in Q5-12.
• Drive response to this condition is controlled by Q5-14, High Suction Pressure Behavior Select.
• Auto-restart of this fault is controlled by Q5-14, High Suction Pressure Behavior Select and Q5-15, Suction
Pressure Auto-restart Time.
HOA Keypad Display
Minor Fault Name
LOAUX
Low PI Aux Lvl
Low PI Auxiliary Feedback Level
Cause
Possible Solution
PI Aux Feedback has fallen below the
Q6-09 level for longer than the time set in
Q6-10 and the drive is running in HAND or
AUTO.
• Raise the PI Aux Feedback level
• Adjust parameters Q6-09 and Q6-10.
HOA Keypad Display
Minor Fault Name
LOP
Loss of Prime
The pump has lost its prime and P1-22 is set to 1.
Cause
Possible Solution
The measured quantity of water has
dropped below the level set in P1-19, Prime
Loss Level, for the time set in P1-20, Loss
of Prime Time, and the output frequency
has risen above P1-21, Prime Loss
Frequency. This could be due to a dry well,
air in the system, or no water in the system.
This is effective only when P1-22 Loss of
Prime Selection is set to 1 (alarm).
• If there is resistance in the pump, allow the system to pump water again.
• Set the Loss of Prime alarm characteristics in P1-18, P1-19, P1-20, and P1-21.
• Drive response to this condition is controlled by P1-21, Loss of Prime Selection.
HOA Keypad Display
Minor Fault Name
LOSUC
Low Suction
Low Section Pressure
Cause
Possible Solution
The suction pressure has fallen below the
level set in Q5-09 for longer than the time
set in Q5-10. This is only effective when
Q5-11, Low Suction Pressure Behavior
Select is set to 1 (alarm).
• Increase the system pressure.
• Set the Low Suction alarm characteristics in Q5-09, Q5-10, and Q5-18. Q5-10 Detection Delay Time only
applies if Q5-01 = 2.
• Drive response to this condition is controlled by Q5-11, Low Suction Pressure Behavior Select.
HOA Keypad Display
Minor Fault Name
Low City Pressure
Low City Pressure
Cause
Possible Solution
Insufficient pressure is present on the inlet
to the pump.
Shown when P4-24 = 0 and when the digital
input has been active (closed for P4-21 = 0,
or open for P4-21 = 1) for the time set in
P4-22.
• Check pressure switch contact for correct operation.
• Check control wiring to drive terminal strip from pressure switch contact.
• Check to make sure that suction pressure is present by means of a separate measuring device.
HOA Keypad Display
Minor Fault Name
Low Feedback Low FB Sensed
Low Feedback Level Alarm
The feedback signal is too low.
Cause
Possible Solutions
5.4 Alarm Detection
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual
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Troubleshooting