PSI 6000 Medium-Frequency Inverters Technical ... - Bosch Rexroth

1-10Safety instructionsDANGEROUS ELECTRICAL VOLTAGEDanger of life through insufficient protective conductor system!The medium-frequency inverters must be connected to the protectiveearthing (PE) circuit of the system. Please ensure that the crosssectionalarea of cables used for protective conductor wiring is sufficientlylarge. The electrical continuity of the protective earthing circuitmust be verified in accordance with EN 60204 Part 1.DANGEROUS ELECTRICAL VOLTAGEAny residual current devices used on the mains side of the MF invertersto protect persons getting into direct or indirect contact must beof type B. As per IEC 60 755, these devices must also be capable ofsafely detecting possible residual currents of 1 kHz frequency.DANGEROUS ELECTRICAL VOLTAGEMF inverters may be operated in earth neutral systems only.Protective grounding is the only protective measure permitted as perprEN 50 178 (DIN VDE 0160)!Operation in systems with ordinary residual-current circuit-breakersis not permitted because of the risk that residual currents may flowfrom the intermediate circuit to earth and back into the systemwithout tripping the RCCB.In the case of operation with an isolating transformer, single-sidedgrounding of the intermediate circuit is not permitted.DANGEROUS ELECTRICAL VOLTAGEOperation in unbalanced networks (only one network phasegrounded) is not permitted.. Note: It is recommended that the whole welding system be operatedwithin a separate welding power network.The MF inverters are approved for operation in grounded systems (TT or TNsystems). For operation in non-grounded systems (e.g., IT systems), anisolation transformer with its center point of earth potential in secondary circuitmust be used.1070 080 059-101 (2001.04) GB