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Siemens 6SN1123-1AA00-0DA2 Configuration Manual
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105.011.3 Engineering a drive1-33© Siemens AG 2012 All Rights ReservedSIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition1.3.1 Calculation of the required DC link power (PZK ) for dimensioningthe supply system, infeed unitSteady–state operation:PZK = PVSA ZK + PMSD ZKPZK Pn infeed module Feed axes with rotary motorsThe following formula is used in the engineering sheet to determine the cal-culated power:Pcalc FD = 0.105 ⋅ M0 ⋅ nn ⋅ 10–3 [kW]Where:Pcalc FD calculated power for feed axes [kW]0.105 factor 2 ⋅ π/60For feed axes, calculated with M0M0 stall torque [Nm]n n rated speed [RPM] Feed axes with linear motorsP = Fn ⋅ VMAX, FN ⋅ 10–3 [kW]Where:F n rated force [N]VMAX, Fn maximum velocity at the rated force [m/min]The DC link power PVSA ZK of the feed axes is calculated using the engineeringsheet. The following factors must be taken into account: Speed ratio ñ/nN Coincidence factor K for the number of feed axes per areaIf the exact values of the speed ratio ñ/nN and coincidence factor K are knownfor the application in question, these should be used. Main spindlesFor main spindle drives, the efficiencies must be included in the calculationand are roughly estimated using the following factors:– Motors 4 kWPMSD ZK 1.45 ⋅ PMSD motor shaft [kW]– Motors 4 kWPMSD ZK 1.25 ⋅ PMSD motor shaft [kW]Where:PMSD ZK DC link power for the main spindle drive [kW]1.45 or 1.25 Assumed factor for the motor efficiencyPmotor shaft MSD mechanical power [kW] used at the shaft of themain spindle motorThe rated motor current may not exceed the rated output current of thepower modules. The maximum motor current must always be less than themaximum converter current.1 Overview of the Drive System02.07 |
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