Kuka · KR C4 Operating Instructions
One or more mains phases supplying the KPP/KSP device have failed. This suggests an issue with the incoming AC power supply to the drive, potentially leading to incorrect operation or shutdown.
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Check the power lead connected to the KPP for disconnections or physical damage.
Inspect the KPP cabling for loose or damaged connections to the mains supply terminals.
Reinitialize the drive bus by performing a Power Off / Power On cycle of the entire system.
Check the KPP module itself for internal faults if mains supply is verified correct.