HOA Keypad Display
Fault Name
GF
Ground Fault
• A current short to ground exceeded 50% of rated current on the output side of the drive.
• Setting L8-09 to 1 enables ground fault detection.
Cause
Possible Solution
Motor insulation is damaged
• Check the insulation resistance of the motor.
• Replace the motor.
A damaged motor cable is creating a short
circuit
• Check the motor cable.
• Remove the short circuit and reapply power to the drive
• Check the resistance between the cable and the ground terminal .
• Replace the cable.
Excessive leakage current at the drive
output
• Reduce the carrier frequency.
• Reduce the amount of stray capacitance.
The drive started to run during a current
offset fault or while coasting to a stop
• Set b3-01 to 1 to enable Speed Search at Start.
• Perform Speed Search 1 or 2 (H1-
oo
= 61 or 62) via one of the external terminals.
Hardware problem
If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
HOA Keypad Display
Fault Name
HFB
High Feedback
The feedback signal is too high.
Cause
Possible Solution
The feedback signal has risen above the
level set in P1-11, High Feedback Level,
for the time set in P1-12, High Feedback
Level Fault Delay Time.
This is effective only when P1-13, High
Feedback Selection, is set to 0 (Fault and
digital out).
• Set the High Feedback fault characteristics in P1-11 and P1-12.
• Drive response to this condition is controlled by P1-13, High Feedback Selection. Auto-restart of this fault
is controlled by L5-41, High Feedback Fault Retry Selection.
HOA Keypad Display
Fault Name
HIAUX
High PI Aux Lvl
High PI Auxiliary Feedback Level
Cause
Possible Solution
PI Aux Feedback has risen above the Q6-12
level for longer than the time set in Q6-13
and the drive is running in AUTO, and
output frequency is greater than zero.
• Lower the PI Aux Feedback level
• Adjust parameters Q6-12 and Q6-13.
HOA Keypad Display
Fault Name
HIFLO
High Flow
High Flow
The meter has detected a high flow condition.
Cause
Possible Solution
The flow is too high
Reduce the flow
The measured water flow has risen above
the P6-17 level for the time set in P6-18.
This is only effective when P6-19, High
Flow Select is set to 2 (fault).
• Set the High Flow fault characteristics in P6-17 and P6-18.
• Drive response to this condition is controlled by P6-19, High Flow Select.
• Auto-restart of this fault is controlled by P6-19, High Flow Select.
HOA Keypad Display
Fault Name
HISUC
High Suction
High Section Pressure
Cause
Possible Solution
The suction pressure has fallen below the
level set in Q5-12 for longer than the time
set in Q5-13. This is only effective when
Q5-14, High Suction Pressure Behavior
Select, is set to 2 (fault).
• Reduce the system pressure.
• Set the High Suction Pressure fault characteristics in Q5-12, Q5-13, and Q5-18.
• 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.
5.3 Fault Detection
186
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual
