HOA Keypad Display
Fault Name
LF
Output Phase Loss
• Phase loss on the output side of the drive.
• Setting L8-07 to 1 or 2 enables Phase Loss Detection.
Cause
Possible Solution
The output cable is disconnected
• Check for wiring errors and properly connect the output cable.
• Correct the wiring.
The motor winding is damaged
• Check the resistance between motor lines.
• Replace the motor if the winding is damaged.
The output terminal is loose
• Apply the tightening torque specified in this manual to fasten the terminals.
Gauges and Tightening Torques on page 110
for details.
The rated current of the motor being used
is less than 5% of the drive rated current
Check the drive and motor capacities.
An output transistor is damaged
If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
A single-phase motor is being used
The drive cannot operate a single phase motor.
HOA Keypad Display
Fault Name
LF3
Power Unit Output Phase Loss 3
• Phase loss occurred on the output side
• Setting L8-78 to 1 enables Power Unit Output Phase Loss Protection
Cause
Possible Solution
The gate drive board in the power unit is
damaged.
Cycle the power supply. If the fault continues to occur, replace the gate drive board or the drive. Contact
Yaskawa or a Yaskawa representative for instructions on replacing the gate drive board.
Cable to the current detection circuit in the
power unit is damaged or not connected
properly.
Check for incorrect wiring and correct any wiring mistakes.
Cable between the output rector and the
power unit is loose or not connected.
Contact Yaskawa or your nearest sales representative for instructions.
<1> Detected in models 4A0930 and 4A1200.
HOA Keypad Display
Fault Name
LFB
Low Feedback
The feedback signal is too low.
Cause
Possible Solution
The feedback signal has dropped below the
level set in P1-08, Low Feedback Level, for
the time set in P1-09, Low Feedback Level
Fault Delay Time.
This is effective only when P1-10, Low
Feedback Selection, is set to 0 (Fault and
digital out).
• Set the Low Feedback fault characteristics in P1-08 and P1-09.
• Drive response to this condition is controlled by P1-10, Low Feedback Selection.
• Auto-restart of this fault is controlled by L5-40, Low Feedback Fault Retry Selection.
HOA Keypad Display
Fault Name
LOAUX
Low PI Aux Lvl
Low PI Auxiliary Feedback Level
Cause
Possible Solution
PI Aux Feedback has fallen below the
Q6-09 level for longer than the time set in
Q6-10 and the drive is running in HAND or
AUTO.
• Raise the PI Aux Feedback level
• Adjust parameters Q6-09 and Q6-10.
HOA Keypad Display
Fault Name
LOP
Loss of Prime
The pump has lost its prime.
Cause
Possible Solution
5.2 Fault Detection
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
257
5
Troubleshooting
Содержание iQpump1000
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