7.4 Fault
264 YASKAWA SIEPC71061753C GA500 Technical Manual
Code Name Causes Possible Solutions
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.
Code Name Causes Possible Solutions
oC Overcurrent
The load is too heavy. • Measure the current flowing into the motor.
• Replace the drive with a larger capacity model if the current
value is more than the drive rated current.
• Decrease the load or replace with a larger drive to prevent
sudden changes in the current level.
Overheating caused damage to the motor or the
motor insulation is not satisfactory.
Measure the motor insulation resistance, and replace the motor if
there is electrical conduction or unserviceable insulation.
The motor main circuit cable is contacting ground
to make a short circuit.
• Examine the motor main circuit cable for damage, and repair
short circuits.
• Measure the resistance between the motor main circuit cable
and the ground terminal. If there is electrical conduction,
replace the cable.
A short circuit or ground fault on the drive output
side caused damage to the output transistor of the
drive.
• Make sure that there is not a short circuit in terminal B1 and
terminals U/T1, V/T2, and W/T3. Make sure that there is not a
short circuit in terminals - and terminals U/T1, V/T2, and W/
T3.
• If there is a short circuit, contact Yaskawa or your nearest sales
representative.
The acceleration time is too short. • Calculate the torque necessary during acceleration related to
the load inertia and the specified acceleration time.
• Increase the values set in C1-01, C1-03, C1-05, or C1-07
[Acceleration Times] to get the necessary torque.
• Increase the values set in C2-01 to C2-04 [S-Curve
Characteristics] to get the necessary torque.
• Replace the drive with a larger capacity model.
The drive is trying to operate a specialized motor or
a motor that is larger than the maximum applicable
motor output of the drive.
• Examine the motor nameplate, the motor, and the drive to
make sure that the drive rated current is larger than the motor
rated current.
• Replace the drive with a larger capacity model.
A magnetic contactor was switched at the output. Set the operation sequence to not turn ON or OFF the magnetic
contactor while the drive is outputting voltage.
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