YASKAWA iQpump1000 User Manual page 257

HOA Keypad Display
LF
Cause
The output cable is disconnected
The motor winding is damaged
The output terminal is loose
The rated current of the motor being used
is less than 5% of the drive rated current
An output transistor is damaged
A single-phase motor is being used
HOA Keypad Display
LF3
<1>
Cause
The gate drive board in the power unit is
damaged.
Cable to the current detection circuit in the
power unit is damaged or not connected
properly.
Cable between the output rector and the
power unit is loose or not connected.
<1> Detected in models 4A0930 and 4A1200.
HOA Keypad Display
LFB
Cause
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).
HOA Keypad Display
LOAUX
Low PI Aux Lvl
Cause
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.
HOA Keypad Display
LOP
Cause
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
Output Phase Loss
• Phase loss on the output side of the drive.
• Setting L8-07 to 1 or 2 enables Phase Loss Detection.
• Check for wiring errors and properly connect the output cable.
• Correct the wiring.
• Check the resistance between motor lines.
• Replace the motor if the winding is damaged.
• Apply the tightening torque specified in this manual to fasten the terminals.
Gauges and Tightening Torques on page 110
Check the drive and motor capacities.
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.
The drive cannot operate a single phase motor.
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
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.
Check for incorrect wiring and correct any wiring mistakes.
Contact Yaskawa or your nearest sales representative for instructions.
Low Feedback
The feedback signal is too low.
• 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.
Low PI Auxiliary Feedback Level
• Raise the PI Aux Feedback level
• Adjust parameters Q6-09 and Q6-10.
Loss of Prime
The pump has lost its prime.
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
5.2 Fault Detection
Refer to Main Circuit Wire
257
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