Cause Possible Solutions
The temperature parameter values are set
incorrectly.
Set the temperature parameters in the following order:
Q2-08 > Q2-07 > Q2-06 > Q2-05
HOA Keypad Display Minor Fault Name
HCA
Current Alarm
Drive current exceeded overcurrent warning level (150% of the rated current).
Cause Possible Solutions
Load is too heavy. Reduce the load for applications with repetitive operations (i.e., stops and starts), or replace the drive.
Acceleration and deceleration times are too
short.
• 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.
A special-purpose motor is being used, or
the drive is attempting to run a motor
greater than the maximum allowable
capacity.
• Check the motor capacity.
• Use a motor appropriate for the drive. Ensure the motor is within the allowable capacity range.
The current level increased due to Speed
Search after a momentary power loss or
while attempting to perform a fault restart.
The alarm will only appear briefly. There is no need to take action to prevent the alarm from occurring in
such instances.
HOA Keypad Display Minor Fault Name
High Feedback High FB Sensed
High Feedback Level Alarm
The feedback signal is too high.
Cause Possible Solutions
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 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
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.
5.3 Alarm Detection
YASKAWA TOEP YAIP1W 01A YASKAWA AC Drive - iQpump1000 Quick Start Guide
197
5
Troubleshooting
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