HOA Keypad Display Fault Name
Load inertia is set incorrectly
• Check the load inertia settings when using KEB, overvoltage suppression, or Stall Prevention during
deceleration.
• Adjust the load inertia ratio in L3-25 to better match the load.
Motor hunting occurs
• Adjust the parameters that control hunting.
• Set the gain for Hunting Prevention (n1-02).
• Adjust the AFR time constant (n2-02 and n2-03).
HOA Keypad Display Fault Name
PF
Input Phase Loss
Drive input power has an open phase or has a large imbalance of voltage between phases. Detected when
L8-05 is set 1 (enabled).
Cause Possible Solution
There is phase loss in the drive input power
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
There is loose wiring in the drive input
power terminals
• Ensure the terminals are tightened properly.
• Apply the tightening torque as specified in this manual. Refer to Main Circuit Wire Gauges and
Tightening Torques on page 110 for details.
There is excessive fluctuation in the drive
input power voltage
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
There is poor balance between voltage
phases
Stabilize drive input power or disable phase loss detection.
The main circuit capacitors are worn out
• Check the maintenance time for the capacitors (U4-05).
• Replace the capacitor if U4-05 is greater than 90%. For instructions on replacing the capacitor, contact
Yaskawa or a Yaskawa representative.
Check for problems with the drive input power. If drive input power appears normal but the alarm continues
to occur, replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or a Yaskawa representative.
HOA Keypad Display Fault Name
PoC Pump Over Cycle
Cause Possible Solution
The pump has exceeded the number of
cycles set in P2-10 in the time set in P2-11
and P2-12 is set to 2 (fault).
• Set the Pump Over Cycle fault characteristics in P2-10 and P2-11.
• Drive response to this condition is controlled by P2-12, Over Cycling Mode.
• Auto-restart of this fault is controlled by L5-52, Pump Over Cycle Fault Retry Selection.
• Set the Pump Over Cycle automatic setpoint compensation in P2-12, Over Cycling Mode, P2-13, Setpoint
Compensation, and P2-14, Maximum Setpoint Compensation.
HOA Keypad Display Fault Name
rF
Braking Resistor Fault
The resistance of the braking resistor is too low.
Cause Possible Solution
The proper braking resistor option has not
been installed
Select a braking resistor option that it fits the drive braking transistor specification.
A regenerative converter, regenerative unit,
or braking unit is being used
Set L8-55 to 0 to disable the braking transistor protection selection.
HOA Keypad Display Fault Name
rH
Braking Resistor Overheat
Braking resistor protection was triggered.
Fault detection is enabled when L8-01 = 1 (disabled as a default).
Cause Possible Solution
Deceleration time is too short and excessive
regenerative energy is flowing back into the
drive
• Check the load, deceleration time, and speed.
• Reduce the load inertia.
• Increase the deceleration times (C1-01 to C1-04).
• Replace the dynamic braking option with a larger device that can handle the power that is discharged.
The duty cycle is too high Check the duty cycle. Maximum of 3% duty cycle is available when L8-01 = 1.
Excessive braking inertia Recalculate braking load and braking power. Reduce the braking load by adjusting braking resistor settings.
5.2 Fault Detection
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
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5
Troubleshooting
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