19 Troubleshooting
YASKAWA TOEPC71061732E HV600 Drive Installation & Primary Operation 105
Code Name Causes Possible Solutions
There is motor hunting. • Adjust n1-02 [Hunting Prevention Gain Setting] settings.
• Adjust n8-45 [Speed Feedback Detection Gain] and n8-47 [Pull-
in Current Comp Filter Time] settings.
Speed search does not complete at start when you use
an induction motor in EZOLV control.
When E9-01 = 0 [Motor Type Selection = Induction (IM)], set b3-
24 = 2 [Speed Search Method Selection = Current Detection 2].
ov2 DC Bus Overvoltage 2
The wiring is too long and DC bus voltage is too
large.
• Shorten the shielded motor cable.
• Decrease the carrier frequency.
• If the power supply has a neutral ground, switch on the internal
EMC filter.
PE1, PE2 PLC Faults
The communication option detected a fault. Refer to the manual for the communication option card.
PF Input Phase Loss
There is a phase loss in the drive input power. Correct errors with the wiring for main circuit drive input power.
There is loose wiring in the drive input power
terminals.
Tighten the terminal screws to the correct tightening torque.
The drive input power voltage is changing too much. • Examine the input power for problems.
• Make the drive input power stable.
• If the input power supply is good, examine the magnetic
contactor on the main circuit side for problems.
There is unsatisfactory balance between voltage
phases.
• Examine the input power for problems.
• Make the drive input power stable.
• Set L8-05 = 0 [Input Phase Loss Protection Sel = Disabled].
The main circuit capacitors have become
unserviceable.
• Examine the capacitor maintenance time in monitor U4-05
[CapacitorMaintenance]. If U4-05 is more than 90%, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales
representative.
• If drive input power is correct and the fault stays, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales
representative.
SC Short Circuit/IGBT Failure
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.
SCF Safety Circuit Fault
The safety circuit is broken. Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
SEr Speed Search Retries Exceeded
The speed search-related parameters are set
incorrectly.
• Decrease b3-10 [Speed Estimation Detection Gain].
• Increase b3-17 [Speed Est Retry Current Level].
• Increase b3-18 [Speed Est Retry Detection Time].
• Do Auto-Tuning again.
STPo Motor Step-Out Detected
The motor code is set incorrectly for PM Control
Methods.
• 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.
TiM Keypad Time Not Set
There is a battery in the keypad, but the date and time
are not set.
Use the keypad to set the date and time.
UL3 Undertorque Detection 1
A fault occurred on the machine.
Example: There is a broken pulley belt.
Examine the machine and remove the cause of the fault.
UL4 Undertorque Detection 2
A fault occurred on the machine.
Example: There is a broken pulley belt.
Examine the machine and remove the cause of the fault.
UL6 Underload or Belt Break Detected
The output current decreased less than the motor
underload curve set in L6-14 [Motor Underload Level
@ Min Freq] for longer than the time set in L6-03
[Torque Detection Time 1].
Adjust the L6-14 setting to set the output current to stay the level
more than the motor underload curve during usual operations.
Uv1 DC Bus Undervoltage
There is a phase loss in the drive input power. Correct errors with the wiring for main circuit drive input power.
There is loose wiring in the drive input power
terminals.
Tighten the terminal screws to the correct tightening torque.
The drive input power voltage is changing too much. • Examine the input power for problems.
• Make the drive input power stable.
• If the input power supply is good, examine the magnetic
contactor on the main circuit side for problems.
There was a loss of power. Use a better power supply.
The main circuit capacitors have become
unserviceable.
Examine the capacitor maintenance time in monitor U4-05
[CapacitorMaintenance]. If U4-05 is more than 90%, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales representative.
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