YASKAWA iQpump1000 User Manual page 265

HOA Keypad Display
Load inertia is set incorrectly
Motor hunting occurs
HOA Keypad Display
PF
Cause
There is phase loss in the drive input power
There is loose wiring in the drive input
power terminals
There is excessive fluctuation in the drive
input power voltage
There is poor balance between voltage
phases
The main circuit capacitors are worn out
HOA Keypad Display
PoC
Cause
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).
HOA Keypad Display
rF
Cause
The proper braking resistor option has not
been installed
A regenerative converter, regenerative unit,
or braking unit is being used
HOA Keypad Display
rH
Cause
Deceleration time is too short and excessive
regenerative energy is flowing back into the
drive
The duty cycle is too high
Excessive braking inertia
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
• 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.
• Adjust the parameters that control hunting.
• Set the gain for Hunting Prevention (n1-02).
• Adjust the AFR time constant (n2-02 and n2-03).
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).
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
• Ensure the terminals are tightened properly.
• Apply the tightening torque as specified in this manual.
Tightening Torques on page 110
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
Stabilize drive input power or disable phase loss detection.
• 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.
Pump Over Cycle
• 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.
Braking Resistor Fault
The resistance of the braking resistor is too low.
Select a braking resistor option that it fits the drive braking transistor specification.
Set L8-55 to 0 to disable the braking transistor protection selection.
Braking Resistor Overheat
Braking resistor protection was triggered.
Fault detection is enabled when L8-01 = 1 (disabled as a default).
• 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.
Check the duty cycle. Maximum of 3% duty cycle is available when L8-01 = 1.
Recalculate braking load and braking power. Reduce the braking load by adjusting braking resistor settings.
Fault Name
Fault Name
Possible Solution
Refer to Main Circuit Wire Gauges and
for details.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
5.2 Fault Detection
5
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