YASKAWA V1000 Series Installation & Start-Up Manual page 205

LED Operator Display
Uv2
Cause
L2-02 changed from its default
value in drive that is 7.5 kW or
smaller without installing a
Momentary Power Loss Ride-Thru.
The wiring for the control power
supply is damaged.
Internal circuitry is damaged.
LED Operator Display
Uv3
Cause
The contactor on the inrush
prevention circuit is damaged.
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
Control Power Supply Voltage Fault
Voltage is too low for the control drive input power.
Correct parameter L2-02 setting or install optional Momentary Power Loss
Ride-Thru unit.
• Cycle power to the drive. Check if the fault reoccurs.
• Replace the drive if the fault continues to occur.
• Cycle power to the drive. Check if the fault reoccurs.
• Replace the drive if the fault continues to occur.
Undervoltage 3 (Inrush Prevention Circuit Fault)
The inrush prevention circuit has failed.
• Cycle power to the drive. Check if the fault reoccurs.
• Replace the drive if the fault continues to occur.
• Check monitor U4-06 for the performance life of the inrush prevention
circuit.
• Replace the drive if U4-06 exceeds 90%.
5.4 Fault Detection
Fault Name
Possible Solution
Fault Name
Possible Solution
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