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Miscellaneous Load Calculations APPENDIX A Rev. Jan 2011 Application Manual – Liquid Cooled Generator Sets occur. This occurs when rapidly changing UPS input frequency results from a sudden transient load change on a generator set. During this transient event, static UPSs with solid–state bypass switches must break synch with the source and disable the bypass. RkW RkW = RkVA x RPF RkVA RkVA = (Output kVA x Recharge Rate) ÷ Efficiency RPF Running power factor as entered or default SkW SkW = RkW SkVA SkVA = RkVA SPF SPF = RPF AkW For 3 pulse, AkW = 2.5 x RkW For 6 pulse, AkW = 1.4 x RkW For 12 pulse, AkW = 1.1.5 x RkW With input filter, AkW = 1.15 x RkW for 6 and 12 pulse AkW = 1.40 x RkW for 3 pulse Ramps 1∅ Ramps = (RkVA x 1000) ÷ voltage 3∅ Ramps = (RkVA x 1000) ÷ (voltage x 1.73) Described below are the types and calculations GenSize uses for the various miscellaneous loads: Welder Load Calculations RkW If RkVA entered: RkW = RkVA x RPF If Ramps entered: 1∅ RkW = (Ramps x voltage x RPF) ÷ 1000 3∅ RkW = (Ramps x voltage x RPF x 1.73) ÷ 1000 RkVA If Ramps entered: RkVA = RkW ÷ RPF RPF Running power factor as entered or default SkW SkW = RkW SkVA SkVA = SkW ÷ SPF PkW PkW = PkVA x SPF PkVA As entered, or 1∅ PkVA = (Pamps x voltage) ÷ 1000 3∅ PkVA = (Pamps x voltage x 1.73) ÷ 1000 SPF SPF = SkVA ÷ SkW AkW AkW = RkW Ramps 1∅ Ramps = (RkVA x 1000) ÷ voltage 3∅ Ramps = (RkVA x 1000) ÷ (voltage x 1.73) General Receptacle Load Calculations RkW RkW = Entered kW RkVA RkVA = RkW ÷ RPF RPF Running power factor as entered or default SkW SkW = RkW SkVA SkVA = SkW ÷ SPF SPF SPF = RPF PkW PkW = RkW PkVA PkVA = RkVA AkW AkW = RkW Ramps 1∅ Ramps = (RkW x 1000) ÷ (voltage x RPF) 3∅ Ramps = (RkW x 1000) ÷ (voltage x RPF x 1.73) User Defined Load Calculations RkW If kW entered: RkW = Kw If kVA entered: RkW = kVA x RPF If Ramps entered: 1∅ RkW = (Ramps x voltage x RPF) ÷ 1000 3∅ RkW = (Ramps x voltage x RPF x 1.73) ÷ 1000 RkVA If kW entered: RkVA = RkW ÷ RPF If RkVA entered: RkVA = kVA If Ramps entered: 1∅ RkVA = (Ramps x voltage) ÷ 1000 3∅ RkVA = (Ramps x voltage x 1.73) ÷ 1000 A–13
Application Manual – Liquid Cooled Generator Sets Entering Loads into Steps RPF Running power factor as entered or default SkW If kW entered: SkW = kW If kVA entered: SkW = SkVA x SPF If Starting amps entered:1∅ SkW = (Ramps x voltage x RPF) ÷ 1000 3∅ SkW = (Ramps x voltage x RPF x 1.73) ÷ 1000 SkVA SkVA = SkW ÷ SPF SPF SPF = RPF, except for HID where default SPF = 0.85 and RPF = 0.90 PkW PkW = SkW PkVA PkVA = SkVA AkW AkW = RkW Ramps 1∅ Ramps = (RkW x 1000) ÷ (voltage x RPF) 3∅ Ramps = (RkW x 1000) ÷ (voltage x RPF x 1.73) Figure A–2. GenSize Application Project Window After entering the loads, you need to enter all of the project loads into Load Steps. Open the first load step by clicking on the Steps folder on the left of the screen. Note that initially, there are no loads in the Step. Step sequence loading can reduce the size of generator set required when using multiple steps. Multiple transfer switches can be used to connect load to the generator set at different times, simply by adjusting the transfer time delays on the individual switches. Simply allow a few seconds between steps to allow the generator set to stabilize with each load step. To enter individual loads into the step, simply click and drag the load over the step. Once the load is placed into a step, you can set the load quantity in the step by right clicking and selecting Set Quantity from the drop down menu. Alternatively, each time you click and drag a load into the step, the quantity will increase. A–14 APPENDIX A Rev. Jan 2011
Page 1 and 2: Chapter 8 Appendices
Page 3 and 4: Application Manual - Liquid Cooled
Page 13: Application Manual - Liquid Cooled
Page 23 and 24: APPENDIX B CONTENTS APPENDIX B CONT
Page 25 and 26: LINE APPENDIX B 3 2 1 Autotransform
Page 27 and 28: LINE 3 2 1 APPENDIX B MOTOR STARTIN
Page 29 and 30: APPENDIX B FULL-VOLTAGE KVA CURVE k
Page 55 and 56: Application Manual -- Liquid Cooled
Page 57 and 58: Application Manual -- Liquid Cooled
Page 59: Application Manual -- Liquid Cooled

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