YASKAWA A1000 HHP Programming Manual page 190

2.4 Fault Detection
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
Digital Operator Display
Cause
Phase loss has occurred on the output side of
the drive
Terminal wires are loose on the output side of
the drive
The output circuit is damaged
Motor impedance or motor phases are uneven
Digital Operator Display
<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.
Digital Operator Display
Cause
The node setup terminal closed during run.
A Run command was issued while the node
setup function was active.
Digital Operator Display
Cause
The motor has been damaged due to
overheating or the motor insulation is
damaged
190
• 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.
• Check for loose terminals.
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.
Output Current Imbalance
LF2
One or more of the phases in the output current are lost.
• Check for faulty wiring or poor connections on the output side of the drive.
• Correct the wiring.
Check for loose terminals.
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.
• Measure the line-to-line resistance for each motor phase. Ensure all values match.
• Replace the motor.
Power Unit Output Phase Loss 3
LF3
• Phase loss occurred on the output side
• Setting L8-78 to 1 enables Power Unit Output Phase Loss Protection
Cycle the power supply.
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.
Check for incorrect wiring and correct any wiring mistakes.
Contact Yaskawa or your nearest sales representative for instructions.
Node Setup Error
nSE
A terminal assigned to the node setup function closed during run.
Stop the drive when using the node setup function.
Overcurrent
oC
Drive sensors detected an output current greater than the specified overcurrent level.
• Check the insulation resistance.
• Replace the motor.
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Diagnosing and Resetting Faults on page 224
Fault Name
Possible Solution
Fault Name
Possible Solution
for details. If the fault