2.4 Fault
46 YASKAWA TOEPYAIGA5001A GA500 DRIVE MAINTENANCE & TROUBLESHOOTING
Code Name Causes Possible Solutions
LF Output Phase Loss
The motor main circuit cable is disconnected. Connect motor main circuit cable wiring. Correct wiring errors in
the main circuit drive input power.
There is a disconnection in the motor coil winding. If a coil is disconnected, measure the motor Line-to-Line Resistance
and replace the motor.
The screws on the drive output terminals are loose. Tighten the terminal screws to the correct tightening torque.
The rated output current of the motor is less than 5%
of the drive rated current.
Examine the drive capacity or the motor output to be applied.
You are trying to use a single-phase motor. The drive cannot operate a single-phase motor.
The output transistor in the drive is damaged. • Re-energize the drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact Yaskawa
or your nearest sales representative.
Note:
• The drive detects this fault if phase loss occurs on the output side of the drive.
• Do a Fault Reset to clear the fault.
• Set L8-07 [Output Phase Loss Protection Sel] to enable and disable LF detection.
Code Name Causes Possible Solutions
LF2 Output Current Imbalance
Phase loss occurred in the wiring on the output side
of the drive.
Examine for wiring errors or disconnected wires on the output side
of the drive, and repair problems.
The output terminal screws of the drive are loose. Tighten the terminal screws to the correct tightening torque.
There is not balance between the three phases of the
PM motor impedance.
• Measure the Line-to-Line Resistance for each motor phase and
make sure that resistance is equal in the three phases, and that all
wires are connected correctly.
• Replace the motor.
The drive output circuit is broken. • Re-energize the drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact Yaskawa
or your nearest sales representative.
Note:
• The drive detects this fault if there is not balance between the three phases of the output current from the PM motor.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
LSo Low Speed Motor Step-Out
The motor code set incorrectly. • Set E5-01 [PM Motor Code Selection] correctly as specified by
the motor.
• For specialized motors, refer to the motor test report and set E5-
xx correctly.
The load is too large. • Decrease the load.
• Replace the drive and motor with larger capacity models.
An external force on the load side caused the motor to
move at start.
Find and repair problems on the load side that cause the motor to
rotate from the load side.
The drive incorrectly detected the motor magnetic
pole position.
• Set b3-01 = 1 [Speed Search at Start Selection = Enabled].
• If the value for U6-57 [PolePolarityDeterVal] is lower than 819,
increase the value set in n8-84 [Polarity Detection Current].
Consult the motor manufacturer for information about maximum
setting values.
The setting of n8-84 [Polarity Detection Current] is
too low.
Increase the n8-84 setting from the default. Consult the motor
manufacturer for information about maximum setting values.
Incorrect values set in L8-93 [Low Speed Pull-out
DetectionTime], L8-94 [Low Speed Pull-out Detect
Level], and L8-95 [Low Speed Pull-out Amount].
Increase the values set in L8-93 to L8-95.
The drive incorrectly detected the motor magnetic
pole position.
If you are using an IPM motor, do High Frequency Injection Auto-
Tuning.
Note:
• The drive detects this fault if it detects step-out while running at low speed.
• Do a Fault Reset to clear the fault.
• LSo is a protective function that stops the motor and stops the reverse run if a motor without a motor code incorrectly detects the initial polarity. To quickly detect motor reversal,
decrease the values set in L8-93 to L8-95 to a range in which the drive does not malfunction.
Code Name Causes Possible Solutions
nSE Node Setup Error
The H1-xx = 47 [Node Setup (CANopen)] terminal
was activated during run.
The drive received a Run command while the Node
Setup function was active.
Stop the drive when the Node Setup function is in use.
Note:
Do a Fault Reset to clear the fault.
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