Electrical installation383ADW000462R0101 DCS880 Hardware Manual e aIT (ungrounded) systemsDon’t use EMC filters in IT systems.The screen winding of existing dedicated transformers must be grounded.For installation without low voltage switch (e.g. contactor, air-circuit-breaker) use anovervoltage protection on the secondary side of the mains transformer.The voltage shift of the isolated supply must not be larger than the voltage shift incase on an earth fault.Supply voltageCheck supply voltages of:Auxiliary voltage XAUX (X99) on SDCS-PIN-H01 /SDCS-POW-H01Cooling fan TerminalsMains voltage for field circuit U1, V1, W1 (if used)Mains voltage for armature circuit U1, V1, W1Connecting the power cablesCheck:Grounding and screening of power cables see manual Technical Guide.Cross sectional areas and tightening torques of power cable see chapterCross-sectional areas - Tightening torques.VU1V1W1SA_550_003_netzanschl_a.aiVoltage shift incase of earth faultEarth fault
