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HOA Keypad Display
Minor Fault Name
Parameter settings are not appropriate for
the load
Check the settings of parameters L6-02 and L6-03.
There is a fault on the machine side
Check the load for any problems.
HOA Keypad Display
Minor Fault Name
UL4
Undertorque Detection 2
The current has fallen below the minimum value set for torque detection (L6-05) for longer than the allowable
time (L6-06).
Cause
Possible Solution
Parameter settings are not appropriate for
the load
Check L6-05 and L6-06 settings
There is a fault on the machine side
Check the load for any problems.
HOA Keypad Display
Minor Fault Name
UL6
Motor Underload
The load has fallen below the underload curve defined in L6-14.
Cause
Possible Solution
The output current has fallen below the
motor underload curve defined in L6-14 for
longer than the time set to L6-03
Adjust the value set to L6-14 so that output current remains above the motor underload curve during normal
operation.
HOA Keypad Display
Minor Fault Name
Uv
Control Circuit Undervoltage
One of the following conditions occurred:
• Contactor to suppress inrush current in the drive was opened.
• Low voltage in the control drive input power. This alarm outputs only if L2-01 is not 0 and DC bus voltage
is under L2-05.
Cause
Possible Solution
Input power phase loss
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
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 drive input power transformer is too
small and voltage drops when the power is
switched on.
• Check for an alarm when the magnetic contactor, line breaker, and leakage breaker are closed.
• Check the capacity of the drive input power transformer.
HOA Keypad Display
Minor 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.
5.4 Alarm Detection
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual
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5
Troubleshooting