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PAGE 20 — INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07)
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.