YASKAWA CIPR-GA50UВ001AJ Series Installation & Primary Operation page 124

15 Troubleshooting
Code Name
GF Ground Fault
LF Output Phase Loss
Output Current
LF2
Imbalance
124
Causes
The feedback sensor is not
operating correctly.
A fault occurred in the feedback
input circuit of the drive.
Overheating caused damage to
the motor or the motor
insulation is not satisfactory.
The motor main circuit cable is
contacting ground to make a
short circuit.
An increase in the stray
capacitance of the cable and the
ground terminal caused an
increase in the leakage current.
There was a problem with the
drive hardware.
The motor main circuit cable is
disconnected.
There is a disconnection in the
motor coil winding.
The screws on the drive output
terminals are loose.
The rated output current of the
motor is less than 5% of the
drive rated current.
You are trying to use a single-
phase motor.
The output transistor in the
drive is damaged.
Phase loss occurred in the
wiring on the output side of the
drive.
YASKAWA TOEPC7106170YB YASKAWA AC Drive GA500 Installation & Primary Operation
Possible Solutions
Examine the sensors on the control
device side.
Replace the control board or the drive.
For information about replacing the
control board, contact Yaskawa or your
nearest sales representative.
Measure the motor insulation resistance,
and replace the motor if there is electrical
conduction or unserviceable insulation.
• 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.
• If the wiring length of the cable is
more than 100 m, decrease the carrier
frequency.
• Decrease the stray capacitance.
Replace the control board or the drive.
For information about replacing the
control board, contact Yaskawa or your
nearest sales representative.
Connect motor main circuit cable wiring.
Correct wiring errors in the main circuit
drive input power.
If a coil is disconnected, measure the
motor Line-to-Line Resistance and
replace the motor.
Tighten the terminal screws to the correct
tightening torque.
Examine the drive capacity or the motor
output to be applied.
The drive cannot operate a single-phase
motor.
• 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.
Examine for wiring errors or
disconnected wires on the output side of
the drive, and repair problems.