GE 90-30 PLC Series Installation And Hardware Manual page 100

Input Power/Current Calculation
GFK-0356Q Chapter 4 Power Supplies
Determine total output load from typical specifications listed for individual modules in
Chapters 2 and 3.
Use the graph to determine average input power.
Divide the input power by the operating source voltage to determine the input current
requirements.
Use the lowest input voltage to determine the maximum input current.
Allow for start-up surge current requirements.
Allow margins ( 0% to 20%) for variations.
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