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Document Title: Tech Guide ~ Yaskawa V1000 Basic User Guide
DC Bus Under Voltage
Input power phase loss.
• The main circuit drive input power is wired incorrectly.
One of the drive input power wiring terminals is loose.
• Ensure there are no loose terminals.
There is a problem with the voltage from the drive input power.
• Check the voltage.
The power has been interrupted.
• Correct the drive input power.
Drive internal circuitry has become worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace the drive if U4-05 exceeds 90%.
Input Power Phase Loss
There is phase loss in the drive input power.
• Check for wiring errors in the main circuit drive input power.
There is loose wiring in the drive input power terminals.
• Ensure the terminals are tightened properly.
There is excessive fluctuation in the drive input voltage.
• Check the voltage from the drive input power.
There is poor balance between voltage phases.
• Stabilize drive input power or disable phase loss detection.
Over Voltage
Deceleration time is too short and regenerative energy flows from the motor into the drive.
• Increase the deceleration time (C1-02, -04, -06, -08).
Drive input power voltage is too high.
• Check the voltage.
Surge voltage entering from the drive input power.
• Install a DC reactor.
Ground fault in the output circuit causing the DC bus capacitor to overcharge.
• Check the motor wiring for ground faults.
The dynamic braking transistor is damaged.
• Replace the drive.
Common Drive Faults
Note: these are basic tips, refer to the technical manual for more information
