If you plan to use a non-ABB high-output motor or an IP23 motor, consider these additionalrequirements for protecting the motor insulation and bearings in drive systems:• If motor power is below 350 kW: Equip the drive and/or motor with the filters and/orbearings according to the table below.• If motor power is above 350 kW: Consult the motor manufacturer.Requirement forNominal AC supplyvoltage ABB du/dt and common mode filters, insulated N-end motor bearingsMotor insulation system100 kW < PN < 350 kW orIEC 315 < frame size <IEC 400PN < 100 kW or framesize < IEC 315134 hp < PN < 469 hp orNEMA 500 < frame size <NEMA 580PN < 134 hp or frame size< NEMA 500+ N or CMF+ N or CMFStandard: ÛLL = 1300 VUN ≤ 500 V+ N + du/dt + CMF+ du/dt + (N or CMF)Standard: ÛLL = 1300 V420 V < UN < 500 Vor+ N or CMF+ N or CMFReinforced: ÛLL = 1600 V,0.2 microsecond rise time+ N + du/dt + CMF+ du/dt + (N or CMF)Reinforced: ÛLL = 1600 V500 V < UN ≤ 600 Vor+ N + CMF+ N or CMFReinforced: ÛLL = 1800 V+ N + du/dt + CMF+ N + du/dtReinforced: ÛLL = 1800 V600 V < UN ≤ 690 V+ N + CMF+ N + CMFReinforced: ÛLL = 2000 V,0.3 microsecond risetime 1)1) If the intermediate DC circuit voltage of the drive is increased from the nominal level due to long term resistor brakingcycles, check with the motor manufacturer if additional output filters are needed in the applied drive operation range.Additional data for calculating the rise time and the peak line-to-line voltageThe diagrams below show the relative peak line-to-line voltage and rate of change of voltageas a function of the motor cable length. If you need to calculate the actual peak voltage andvoltage rise time considering the actual cable length, proceed as follows:• Peak line-to line voltage: Read the relative ÛLL/UN value from the diagram below andmultiply it by the nominal supply voltage (UN).• Voltage rise time: Read the relative values ÛLL/UN and (du/dt)/UN from the diagrambelow. Multiply the values by the nominal supply voltage (UN) and substitute into equationt = 0.8 · ÛLL/(du/dt).68 Guidelines for planning the electrical installation
