13 Troubleshooting
YASKAWA TOEPC71061752B GA500 Drive Installation & Primary Operation 95
Code Name Causes Possible Solutions
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.
The output terminal screws of the
drive are loose.
Tighten the terminal screws to the correct
tightening torque.
There is not balance between the
three phases of the PM motor
impedance.
• Measure the Line-to-Line Resistance for
each motor phase and make sure that
resistance is equal in the three phases,
and that all wires are connected correctly.
• Replace the motor.
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.
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.
To Next Page
Loading...
