YASKAWA iQpump1000 - Page 269

HOA Keypad Display Fault Name
Internal circuitry is damaged
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, 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
Uv3
Undervoltage 3 (Soft-Charge Bypass Circuit Fault)
The soft-charge bypass circuit failed.
Cause Possible Solution
The relay or contactor on the soft-charge
bypass circuit is damaged
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
HOA Keypad Display Fault Name
Uv4
<1>
Gate Drive Board Undervoltage
Voltage drop in the gate drive board circuit
Cause Possible Solution
Not enough power is being supplied to the
gate drive board.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the gate drive board or the entire drive. For instructions on replacing
the gate drive board, contact Yaskawa or a Yaskawa representative.
<1> Detected in models 4A0930 and 4A1200.
HOA Keypad Display Fault Name
VLTS Volute-Thermostat Fault
Cause Possible Solution
The digital input assigned to the volute/
thermostat input (H1-0o = 88 or 89) is
active.
Check the wiring or wait for the volute or motor to cool.
Both volute/thermostat inputs are
programmed simultaneously (H1-0o = 88
and 89).
•
Program only one digital input to either H1-0o = 88 or H1-0o = 89.
• Auto-restart of this fault is controlled by parameter L5-53, Volute-TStat Retry Selection.
HOA Keypad Display Fault Name
voF
Output Voltage Detection Fault
Problem detected with the voltage on the output side of the drive.
Cause Possible Solution
Hardware is damaged. Internal drive
module MC / FAN overheat protection
circuit board is due to abnormal ambient
operating power.
• Lower ambient temperature.
• Replace 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
WLL
Water Level Loss
Water Level Loss
Cause Possible Solution
An analog input programmed for setting 23
“WaterLvl/Suction” has dropped below 3
mA or risen above 21 mA for longer than 1
second.
Repair level sensor or wiring.
5.2 Fault Detection
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
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Troubleshooting