Yaskawa iQpump1000 AC Drive Quick Start - Manual (Page 266)

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 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.
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.
• 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
The feedback level has dropped below the
level set in P1-08, Low Feedback Level
This is only effective when P1-10, Low
Feedback Selection, is set to 1 (Alarm and
digital out).
• Increase the feedback signal.
• Set the Low Feedback alarm characteristics in P1-08 and P1-09.
• Drive response to this condition is controlled by P1-10, Low Feedback Selection.
HOA Keypad Display Minor Fault Name
Low Suction Pressure Low Suction Pressure
Cause Possible Solution
Insufficient suction pressure is present.
This is only effective when Q5-11, Low
Suction Pressure Behavior Select is set to 1
(alarm).
• 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.
• Increase the system pressure.
• Set the Low Suction alarm characteristics in Q5-09, Q5-10, and Q5-18.
• Drive response to this condition is controlled by Q5-11, Low Suction Pressure Behavior Select.
HOA Keypad Display Minor Fault Name
Low Water in Tank Low Water in Tank
Cause Possible Solution
The water level in the tank is too low. This
is only effective when Q4-11, Low Level
Behavior is set to 1 (alarm).
• 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.
• Raise the water level.
• Set the Low Water Level alarm characteristics in Q4-09 and Q4-10.
• Drive response to this condition is controlled by Q4-11, Low Level Behavior.
5.3 Alarm Detection
266 YASKAWA TOEP YAIP1W 01B YASKAWA AC Drive - iQpump1000 Quick Start Guide