GENSET SIZING
Generator Set Sizing Calculations (Continued)
Step 3. Enter Individual Load Characteristics
a.Calculate the values for SkVA, SkW, RkVA, and RkW and then enter the values on the worksheets. See determining load characteristics on page 22 for instructions on how to calculate the values for various types of loads.
b.If the load quantity (QTY) is one, enter the values for SkVA, SkW, RkVA, and RkW directly onto the columns under the load step totals heading.
c.If the load quantity is greater than one, enter the values for SkVA, SkW, RkVA, and RkW in the columns under the individual load characteristics heading. Then multiply each load entry by the number under QTY and enter the products under the load step totals heading for SkVA, SkW, RkVA, and RkW.
d.If nonlinear loads are included, calculate a GkW value for each nonlinear load and enter it under the GkW column. Follow the guidelines in part C above for multiple nonlinear loads.
e.In order to obtain a total GkW in applications that include linear as well as nonlinear loads, enter the values for RkW for all the linear loads under GkW as well (RkW = GkW for linear loads only).
Step 4. Enter Individual Load Characteristics
Now all the loads on the load schedule should be listed on the generator set sizing worksheets, all the load characteristics should be calculated and entered on the worksheets, and the worksheets numbered in load step sequence.
Referring back to Figure 1, find the load step totals as follows:
a.Starting with worksheet #1 (Load Step #1), add the entries in each column under the load step totals heading and enter the sums on the load step totals line.
b.On worksheet #2 enter the load step totals from worksheet #1 as instructed on the worksheet.
c.Repeat steps a and b as necessary through all the worksheets.
d.Go back through all the worksheets and highlight or circle the highest load step total of SkVA, SkW, RkVA, RkW, and GkW. Generator set selection will be based on these values.
PAGE 20 — INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07)