MIL-HDBK-1005/7A
6.13.5.2 Automatic . Use automatic control to start, stop, or
regulate rates of operations automatically in response to
changes in a measured variable or other input. All equipment
should also have manual control to override automatic control
regardless of the degree of automation provided.
6.13.5.3 Design Considerations. Many controls combine manual
and automatic operations. The operator may initiate an
automatic -timed cycle backwash system, or adjust set points of a
proportional controller based on instrument observation.
Controls that seldom require adjustment (rate of flow to
filters, for example) should be manual. Controls requiring
frequent adjustment (starting sump pumps, proportional chemical
feeding) should be automatic. Decisions on whether the
automation is on/off -timed cycle, or proportional, should be
based on analysis of plant requirements.
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