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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
• Check for loose terminals.
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.
Digital Operator Display
Fault Name
LF2
Output Current Imbalance
One or more of the phases in the output current are lost.
Cause
Possible Solution
Phase loss has occurred on the output side of
the drive
• Check for faulty wiring or poor connections on the output side of the drive.
• Correct the wiring.
Terminal wires are loose on the output side of
the drive
Check for loose terminals.
The output circuit 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.
Motor impedance or motor phases are uneven
• Measure the line-to-line resistance for each motor phase. Ensure all values match.
• Replace the motor.
Digital Operator 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.
Refer to Diagnosing and Resetting Faults on page 224
continues to occur, replace the gate drive board or the entire 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.
Digital Operator Display
Fault Name
nSE
Node Setup Error
A terminal assigned to the node setup function closed during run.
Cause
Possible Solution
The node setup terminal closed during run.
Stop the drive when using the node setup function.
A Run command was issued while the node
setup function was active.
Digital Operator Display
Fault Name
oC
Overcurrent
Drive sensors detected an output current greater than the specified overcurrent level.
Cause
Possible Solution
The motor has been damaged due to
overheating or the motor insulation is
damaged
• Check the insulation resistance.
• Replace the motor.
2.4 Fault Detection
190
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
Summary of Contents for A1000 HHP
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