7.4 Faults
260 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Code Name Causes Possible Solutions
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 the manufacturer or your
nearest sales representative.
Note:
• The drive detects this fault if the PID feedback input is more than the level set in b5-13 for longer than b5-14.
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the stop method set in b5-12 [Fdback Loss Select Mode].
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 the manufacturer or your
nearest sales representative.
Note:
• The drive detects this fault if a current short to ground was more than 50% of rated current on the output side of the drive.
• Do a Fault Reset to clear the fault.
• L5-08 [U/OV,OH,GF A-Reset Select] disables the Auto Restart function.
Code Name Causes Possible Solutions
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 the
manufacturer or your nearest sales representative.
Note:
• The drive detects this fault if phase loss occurs on the output side of the drive.
• Do a Fault Reset to clear the fault.
• Set L8-07 [Out PhaseLoss Selection] to enable and disable LF detection.
Code Name Causes Possible Solutions
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 the
manufacturer 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 Mot 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 heavy. • 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 [SpSrch@Start Selection = Enabled].
• If the value for U6-57 [PoleDis IdDifVal] is lower than 819,
increase the value set in n8-84 [Polarity Det Current].
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