YASKAWA iQpump1000 Quick Start Manual page 181

The feedback signal has dropped below the
level set in P1-08, Low Feedback Level, for
the time set in P1-09, Low Feedback Level
Fault Delay Time.
This is effective only when P1-10, Low
Feedback Selection, is set to 0 (Fault and
digital out).
HOA Keypad Display
LOP
Cause
The pump load, measured based on the
P1-18 setting (output current, kilowatts, or
power), 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 is effective only
when P1-22 Loss of Prime Selection is set
to 0 (fault).
HOA Keypad Display
LOSUC
Low Suction
Cause
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 2 (fault).
HOA Keypad Display
LOWFL
Low Flow
Cause
Insufficient flow
After waiting the P6-08 delay time at start,
the measured water flow has fallen below
the P6-06 level for the time set in P6-07.
This is only effective when P1-09, Low
Flow Select is set to 2 (fault).
HOA Keypad Display
LOWWL
Low Water Level
Cause
The water level has fallen below the level
set in Q4-09 for the longer than the time set
in Q4-10. This is only effective when
Q4-11, Low Level Behavior is set to 2
(fault).
HOA Keypad Display
LWL
Cause
The Low Water Level switch is activated,
defective, or P1-30, Low Water Digital
Input Configuration, is programmed
incorrectly.
YASKAWA TOEP YAIP1W 01A YASKAWA AC Drive - iQpump1000 Quick Start Guide
• Set the Low Feedback fault characteristics in P1-08 and P1-09.
• Drive response to this condition is controlled by P1-10, Low Feedback Selection.
• Auto-restart of this fault is controlled by L5-40, Low Feedback Fault Retry Selection.
Loss of Prime
The pump has lost its prime.
• Check for a dry well, air in the system, or no water in the system. Restart the pump using the preferred
priming method suggested by the pump manufacturer.
• Set the Loss of Prime fault 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.
• Auto-restart of this fault is controlled by L5-51, Loss of Prime Fault Retry Selection and P1-23, Loss of
Prime Maximum Restart Time after Fault
Low Section Pressure
• Increase the system pressure.
• Set the Low Suction fault characteristics in Q5-09, Q5-10, and Q5-18.
• Drive response to this condition is controlled by Q5-11, Low Suction Pressure Behavior Select.
• Auto-restart of this fault is controlled by Q5-11, Low Suction Pressure Behavior Select and Q5-15, Suction
Pressure Auto-restart Time.
Low Flow
Increase flow
• Set the Low Flow fault characteristics in P6-06, P6-07, and P6-08.
• Drive response to this condition is controlled by P6-09, Low Flow Select.
• Auto-restart of this fault is controlled by P6-09, Low Flow Select and P6-10, Low Flow Auto-restart Time.
Low Water Level
• Raise the water level.
• Set the Low Water Level fault characteristics in Q4-09 and Q4-10.
• Drive response to this condition is controlled by Q4-11, Low Level Behavior.
• Auto-restart of this fault is controlled by Q4-11, Low Level Behavior and Q4-12 Water Level Control
Auto-restart Time.
Low Water Level
The "Low Water Level" digital input is active (H1-0o = 8F).
Raise the water level and/or adjust the Low Water Level switch.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
5.2 Fault Detection
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