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HOA Keypad Display
Minor Fault Name
Fdv
Power Supply Frequency Fault
The input power supply frequency exceeded the allowable frequency fluctuation.
Cause
Possible Solution
A momentary power loss occurred.
Reset the fault.
An input power supply wiring terminal is
loose.
Check for loose terminals.
The fluctuation in the voltage of the input
power supply is too large.
Increase the Power Supply Frequency Fault Detection Width (L2-27).
The built-in fuse is open.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
The phase rotation direction has changed in
the input power supply.
Correct the wiring.
The detected power supply frequency
exceeded the allowable value.
Improve the power supply.
HOA Keypad Display
Minor Fault Name
Feedback Loss Go To Freq. b5-13
PI Feedback Loss
The drive will run at the speed set in b5-13, Feedback Loss Goto Frequency.
Cause
Possible Solutions
PI feedback source is incorrectly installed
or is not working. Effective only when
b5-12 is set to 3 (Run at b5-13).
• Confirm that the PID feedback source is installed and working properly.
• Drive response to this condition is controlled by b5-12, Feedback Loss 4 to 20 mA Detection Selection,
and b5-13, Feedback Loss Go To Frequency.
HOA Keypad Display
Minor Fault Name
Feedback Loss Wire Break
PI Feedback Loss
The analog input programmed for PID feedback has gone above 21 mA or fallen below 3 mA.
Cause
Possible Solutions
PI feedback source is incorrectly installed
or is not working. This is effective only
when b5-12 Feedback Loss 4 to 20 mA
Detection Selection is set to 1 (alarm).
• Confirm that the PID feedback source is installed and working properly.
• Drive response to this condition is controlled by b5-12, Feedback Loss 4 to 20 mA Detection Selection,
and b5-13, Feedback Loss Go To Frequency.
• Auto-restart of this fault is controlled by L5-42, Feedback Loss Fault Retry Selection.
HOA Keypad Display
Minor Fault Name
Freq. Ref Pump Min (P1-06)
Minimum Pump Frequency Reference
Drive frequency reference is set lower than P1-06, Minimum Pump Frequency.
Cause
Possible Solutions
The frequency reference is set lower than
P1-06. The frequency reference is
internally set to the P1-06 value during this
time.
This will only be active when the following
conditions are true:
• Drive is NOT in PI Mode
• Minimum Pump Frequency is enabled
(P1-06 > 0.00)
Increase the frequency reference to a value greater than P1-06.
HOA Keypad Display
Minor Fault Name
Freq. Ref Thrust (P4-12)
Thrust Frequency Reference
The fixed frequency reference is set to a value lower than the P4-12, Thrust Frequency, setting.
Cause
Possible Solutions
The frequency reference is set lower than
P4-12. The frequency reference is
internally set to the P4-12 value during this
time.
This will only be active when the following
conditions are true:
• Drive is NOT in PI Mode
• Thrust bearing is enabled (P4-12 > 0.00)
Increase the frequency reference to a value greater than P4-12.
5.4 Alarm Detection
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual
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Troubleshooting