YASKAWA A1000 Series Quick Start Manual page 185

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
<1>
Cause
The incorrect motor code has been entered.
The load is too heavy.
The drive incorrectly detected the position of
the motor poles.
Values set to parameters L8-93, L8-94, and
L8-95 are incorrect.
<1> This function prevents continuous operation in reverse when using high frequency injection (n8-57 = 1) in AOLV/PM (A1-02 = 6) with a motor
for which no motor code has been entered (it does not only prevent reverse operation). Set L8-93, L8-94, and L8-95 to low values within range of
erroneous detection to quickly detect undesirable reverse operation.
Digital Operator Display
Cause
Overcurrent occurred during Overexcitation
Deceleration.
The node setup terminal closed during run.
A Run command was issued while the node
setup function was active.
YASKAWA ELECTRIC TOEP C710616 41G YASKAWA AC Drive - A1000 Quick Start Guide
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.
Apply the tightening torque specified in this manual to fasten the terminals.
Gauges and Tightening Torques on page 94
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. 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.
LSo Fault
LSo
Pull-out has been detected at low speed.
• Enter the correct motor code for the PM motor being used into E5-01.
• For special-purpose motors, enter the correct data to all E5 parameters according to the test report
provided for the motor.
• Reduce the load.
• Use a larger drive.
• Make sure some external force is not rotating the motor at start.
• Enable Speed Search Selection at start. (b3-01 = 1).
• If the value displayed in U6-57 is lower than 819, then set the polarity judge current (n8-84) higher
than the default value. If the motor is to be operated at a speed higher than the rated speed, consult with
the manufacturer.
• Increase the value set to L8-93.
• Increase the value set to L8-94.
• Increase the value set to L8-95.
Node Setup Error
nSE
A terminal assigned to the node setup function closed during run.
Stop the drive when using the node setup function.
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Reduce the overexcitation deceleration gain (n3–13).
5.2 Fault Detection
Refer to Main Circuit Wire
185
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