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
Apply the tightening torque specified in this manual to fasten the terminals. Refer to Main Circuit Wire
Gauges and Tightening Torques on page 85 for details.
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
<1>
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. Refer to Diagnosing and Resetting Faults on page 327 for details. If the fault
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.
One of the motor cables has shorted out or
there is a grounding problem
• Check the motor cables.
• Remove the short circuit and reapply power to the drive.
• Check the resistance between the motor cables and the ground terminal .
• Replace damaged cables.
The load is too heavy
• Measure the current flowing into the motor.
• Replace the drive with a larger capacity drive if the current value exceeds the rated current.
• Determine if there is sudden fluctuation in the current level.
• Reduce the load to avoid sudden changes in the current level or switch to a larger drive.
The acceleration or deceleration times are too
short
Calculate the torque needed during acceleration relative to the load inertia and the specified acceleration
time. If it is not possible to set the proper amount of torque, make the following changes:
• Increase the acceleration time (C1-01, C1-03).
• Increase the S-curve characteristics (C2-01 through C2-04).
• Increase the capacity of the drive.
6.4 Fault Detection
300
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
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