HOA Keypad Display
Fault Name
One of the drive input power wiring
terminals is loose
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.
Gauges and Tightening Torque on page 67
for details.
There is a problem with the voltage from
the drive input power
• Check the voltage.
• Correct the voltage to be within the range listed in drive input power specifications.
• If there is no problem with the power supply to the main circuit, check for problems with the main circuit
magnetic contactor.
The power has been interrupted
Correct the drive input power.
The capacitors are worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace the entire drive if U4-05 exceeds 90%. Contact Yaskawa or your nearest sales representative.
The relay or contactor on the soft-charge
bypass circuit is damaged.
• Cycle power to the drive.
• If the problem continues, replace the entire drive. Contact Yaskawa or your nearest sales representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace the entire drive if U4-06 exceeds 90%. Contact Yaskawa or your nearest sales representative.
HOA Keypad Display
Fault Name
Uv2
Control Power Supply Voltage Fault
Voltage is too low for the control drive input power.
Cause
Possible Solution
Control power supply wiring is damaged
• Cycle power to the drive.
• If the problem continues, replace the entire drive or the control power supply.
Internal circuitry is damaged
• Cycle power to the drive.
• If the problem continues, replace the entire drive. Contact Yaskawa or your nearest sales 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.
• If the problem continues, replace the entire drive. Contact Yaskawa or your nearest sales representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace the entire drive if U4-06 exceeds 90%. Contact Yaskawa or your nearest sales representative.
HOA Keypad Display
Fault Name
VLTS
Volute-Thermostat Fault
Cause
Possible Solution
The digital input assigned to the volute/
thermostat input (H1-0
o
= 88 or 89) is
active.
Check the wiring or wait for the volute or motor to cool.
Both volute/thermostat inputs are
programmed simultaneously (H1-0
o
= 88
and 89).
• Program only one digital input to either H1-0
o
= 88 or H1-0
o
= 89.
• Auto-restart of this fault is controlled by parameter L5-53, Volute-TStat Retry Selection.
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.
5.3 Fault Detection
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Troubleshooting