19 Troubleshooting
YASKAWA TOEPC71061737B GA800 Drive Installation & Primary Operation 111
Code Name Causes Possible Solutions
GF Ground Fault
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.
An increase in the stray capacitance of the cable and
the ground terminal caused an increase in the leakage
current.
• If the wiring length of the cable is more than 100 m, decrease the
carrier frequency.
• Decrease the stray capacitance.
There was a problem with the drive hardware. Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
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.
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.
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.
nSE Node Setup Error
The H1-xx = 47 [Node Setup (CANopen)] terminal
was activated during run.
Stop the drive when the Node Setup function is in use.
oC Overcurrent
The load is too large. • 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.
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