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Code
Name
Uv1
DC Bus Undervoltage
Control Power
Uv2
Undervoltage
◆
Disposal
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Disposal Instructions
Correctly dispose of the product and packing material as specified by applicable regional, local,
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WEEE Directive
YASKAWA TOMPYEULA5001C LA500 Installation and Operation Instructions
Causes
There is a phase loss in the drive
input power.
There is loose wiring in the drive
input power terminals.
The drive input power voltage is
changing too much.
There was a loss of power.
The main circuit capacitors have
become unserviceable.
The relay or contactor on the soft-
charge bypass relay is damaged.
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.
There was a problem with the
drive hardware.
Possible Solutions
Correct errors with the wiring for main
circuit drive input power.
Tighten the terminal screws to the correct
tightening torque.
• 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.
Use a better power supply.
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.
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.
Connect the momentary power loss recovery
unit to the drive.
• 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.
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