13 Troubleshooting
108 YASKAWA TOEPC71061752B GA500 Drive Installation & Primary Operation
Code Name Causes Possible Solutions
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.
The relay or contactor on the soft-
charge bypass relay is damaged.
U4-06 [PreChargeRelayMainte] shows the
performance life of the soft-charge bypass
relay. If U4-06 is more than 90%, replace
the board or the drive. For information
about replacing the board, contact Yaskawa
or your nearest sales representative.
Uv2
Control Power
Undervoltage
The value set in L2-02 [Power
Loss Ride Through Time]
increased and the momentary
power loss recovery unit is not
connected to the drive.
Connect the momentary power loss recovery
unit to the drive.
There was a problem with the
drive hardware.
• 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.
Uv3
Soft Charge
Answerback Fault
The relay or contactor on the soft-
charge bypass relay is damaged.
• Re-energize the drive.
• If the fault stays, replace the control
board or the drive.
• Check monitor U4-06
[PreChargeRelayMainte] shows the
performance life of the soft-charge
bypass relay. If U4-06 is more than 90%,
replace the board or the drive. For
information about replacing the control
board, contact Yaskawa or your nearest
sales representative.
◆ Minor Faults/Alarms
This section gives information about the causes and possible solutions when a minor fault or
alarm occurs. Use the information in this table to remove the cause of the minor fault or alarm.
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