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Document Title: Tech Guide ~ Yaskawa J1000/V1000/GA500 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.
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Ensure there are no loose terminals.
There is a problem with the voltage from the drive input power.
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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.
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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.
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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.
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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
