YASKAWA iQpump1000 Quick Start Manual page 197

Cause
The temperature parameter values are set
incorrectly.
HOA Keypad Display
HCA
Cause
Load is too heavy.
Acceleration and deceleration times are too
short.
A special-purpose motor is being used, or
the drive is attempting to run a motor
greater than the maximum allowable
capacity.
The current level increased due to Speed
Search after a momentary power loss or
while attempting to perform a fault restart.
HOA Keypad Display
High Feedback High FB Sensed
Cause
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).
HOA Keypad Display
LOP
Cause
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).
HOA Keypad Display
Low City Pressure
Cause
Insufficient pressure is present on the inlet
to the pump.
HOA Keypad Display
Low Feedback Low FB Sensed
Cause
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).
YASKAWA TOEP YAIP1W 01A YASKAWA AC Drive - iQpump1000 Quick Start Guide
Set the temperature parameters in the following order:
Q2-08 > Q2-07 > Q2-06 > Q2-05
Current Alarm
Drive current exceeded overcurrent warning level (150% of the rated current).
Reduce the load for applications with repetitive operations (i.e., stops and starts), or replace the drive.
• Calculate the torque required during acceleration and for the inertia moment.
• If the torque level is not right for the load, take the following steps:
• Increase the acceleration and deceleration times (C1-01 through C1-04).
• Increase the capacity of the drive.
• Check the motor capacity.
• Use a motor appropriate for the drive. Ensure the motor is within the allowable capacity range.
The alarm will only appear briefly. There is no need to take action to prevent the alarm from occurring in
such instances.
High Feedback Level Alarm
The feedback signal is too high.
• 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.
Loss of Prime
The pump has lost its prime and P1-22 is set to 1.
• 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.
Low City Pressure
• 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.
Low Feedback Level Alarm
The feedback signal is too low.
• 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.
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Fault Name
Possible Solution
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solutions
5.3 Alarm Detection
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