Kuka · KR C4 Operating Instructions
A failure has been detected in one or more mains input phases supplying the KPP or KSP device for a specific axis. This indicates an issue with the incoming AC power supply to the drive, such as a blown fuse, tripped breaker, or open phase. Loss of a mains phase can cause imbalances, overheating, and prevent the drive from operating.
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Inspect the power lead connecting to the KPP for damage, loose connections, or incorrect phasing.
Inspect all KPP cabling, including input power terminals, for secure connections and integrity.
Perform a Power Off / Power On cycle of the entire system to reinitialize the drive bus.
Check the status indicators or diagnostics of the KPP device.