YASKAWA AC Drive GA700 High Performance Type Technical Manual

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.

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.