124
YASKAWA
TOEPC7106170YB YASKAWA AC Drive GA500 Installation & Primary Operation
Code
Name
Causes
Possible Solutions
The feedback sensor is not
operating correctly.
Examine the sensors on the control
device side.
A fault occurred in the feedback
input circuit of the drive.
Replace the control board or the drive.
For information about replacing the
control board, contact Yaskawa or your
nearest sales representative.
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.
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.
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.