Yaskawa CIMR-AU 200V Drives User Manual
Page 205
Digital Operator Display
Fault Name
LF
Output Phase Loss
• Phase loss on the output side of the drive.
• Setting L8-07 to 1 or 2 enables Phase Loss Detection.
Cause
Possible Solution
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
• Apply the tightening torque specified in this manual to fasten the terminals.
Wire Gauges and Tightening Torque on page 120
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
Apply the tightening torque specified in this manual to fasten the terminals.
Gauges and Tightening Torque on page 120
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. 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.
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
<1>
LSo
LSo Fault
Pull-out has been detected at low speed.
Cause
Possible Solution
The incorrect motor code has been entered.
• 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.
The load is too heavy.
• Reduce the load.
• Replace the drive with a larger model.
The drive incorrectly detected the position of
the motor poles.
• 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.
5.2 Fault Detection
YASKAWA ELECTRIC TOEP C710616 41E YASKAWA AC Drive - A1000 Quick Start Guide
205
5
Troubleshooting