ABB 3BDH000033R1 card stock

ABB 3BDH000033R1 card stock

Technical data of product parameters

As the temperature of loop 1 drops, the output of loop 1 goes up proportionally and the setpoint
of loop 2 goes up proportionally. Thus heat is added to the system at the element even though the 3BDH000033R1
temperature near the element may have been at setpoint (150°F).
With proportional control, when loop 1 is at setpoint, its output is 0%, and the setpoint of loop 2 is
equal to the base setpoint (150°F). If the temperature of loop 1 drops to 149°F, the deviation results
in a proportional output of 10%. This times the span of 40° F results in an increase in setpoint for
loop 2 of 4°F. The loop 2 setpoint increases to 154°F. For every degree that loop 1 drops, loop 2 3BDH000033R1
increases by 4°F until the output of loop 1 is 100% and the loop 2 setpoint is 190°F. Any further drop
in the loop 1 process variable does not affect loop 2.
The PID parameters of loop 2 must be tuned to perform efficient control.
For two-zone cascade control systems, the PID settings for both loops, the primary plus the 3BDH000033R1
secondary, must be optimized for good temperature control.A chemical process requires a formula of two parts water (H2
O) to one part potassium hydroxide
(KOH) to produce diluted potassium hydroxide. The desired flow of H2
O is 10 gallons per second
(gps), so the KOH should flow at 5 gps. Separate pipes for each chemical feed a common pipe. The
flow rate of each feeder pipe is measured by a CLS200, with H2
O flow as process variable 1 and
KOH flow as process variable 2. The outputs of loops 1 and 2 adjust motorized valves.

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