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Yaskawa GA500 Uv1: DC Bus UndervoltageCites the manual · line-by-line check pending
What it means DC bus fell too low while running.
Safety Safety disclaimer: General information only, written in plain English by an experienced maintenance hand. It is not the manufacturer's instructions. Always follow the OEM manual, your site procedures and local electrical codes. Only qualified people should work on this equipment.
LOTO LOTO: Lock out and tag out all energy sources before touching wiring, motors or mechanics. Wait the drive's stated DC bus discharge time and verify zero energy with a meter before you work.
Likely causes Supply dip Loose input wiring Checks, in order Check supply and wiring Source Source (reworded, not copied): Yaskawa, GA500 Drive Maintenance & Troubleshooting Manual, TOEPYAIGA5001A, Faults. Official manual (PDF) . Fault numbers and names can differ between firmware versions.