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The benefits and challenges of cascade control
May 24, 2023 — This situation represents the first of two reasons to consider cascade. From a process view, the controller influence on the temperature is the steam flow rate. The controller changes steam flow rate through the valve. But some other influences can also affect the steam flow rate, so control it.
Top 50 Automation Companies of 2021: Green Muscles In
Nov. 8, 2022. The Top 50 global and North American automation suppliers fend off recession with sustainability and digitalization. Larry O'Brien, Chantal Polsonetti, Mike Guilfoyle. The automation marketplace proved its resilience again in 2021 and returned to pre-pandemic levels. Despite advances in project engineering that reduced cycle times ...
How to size and select your next pressure relief valve
Nov 4, 2020 — Ghulam Farooq. A pressure relief valve (PRV) is a safety device designed to protect a pressurized vessel or system in case of an overpressure event. An overpressure event refers to any condition that would cause pressure in a vessel or system to increase beyond the specified design pressure or maximum allowable working pressure (MAWP).
How valve failure modes interact with controller actions and …
Dec 9, 2021 — The controller action is selected for the total loop (Figure 1) to always have negative feedback (RA). Each RA (180° phase shift) in the loop causes a sign reversal, while each DA results in no phase shift. In terms of the total loop, this means that if both the valve and the process are DA (phase shift = 0) or if both are RA (phase shift -180 ...
Rockwell Automation’s expanding technology strategy
Nov 9, 2023 — Agile. Sustainable. These are the three key outcomes Rockwell Automation is focused on creating for users of its technologies, said Blake Moret, chairman and CEO of Rockwell Automation during the opening keynote at Automation Fair 2023. “Our job is to understand customers’ complex challenges, help them better define what the specific issues ...
Understanding switch configurations - Control Global
Nov 25, 2019 — A: NO and NC are the fundamental blocks of understanding any logic, be it soft or hardware. Normal condition is defined as energized condition and when plant/equipment/machine is running in normal condition, logic is true. NC means normally-closed contact. NO means normally-open contact.
Good grounding practices - Part 1 | Control Global
Nov 13, 2018 — Standard manufacturer’s recommended grounding practices for handling digital equipment should be followed. It's also common practice for raised-floor installations to specify a resistivity for the floor tile or a resistance to ground. For example, IBM specifies no greater than 2 x 1010 ohms to the ground reference.
Back to Basics: Understanding how ultrasonic continuous level ...
Aug 7, 2013 — Ultrasonic level sensors work by the "time of flight" principle using the speed of sound. The sensor emits a high-frequency pulse, generally in the 20 kHz to 200 kHz range, and then listens for the echo. The pulse is transmitted in a cone, usually about 6° at the apex.
A straightforward explanation of feedforward control
Jun 9, 2020 — Greg: The use of feedforward control is often a missed opportunity because of the misinformation in the literature and the lack of guidance on implementation. Here we get a straightforward understanding and approach to feedforward control from Peter Morgan, who as leader of the ISA 5.9 Standards and Practices (S&P) working group for PID algorithms is responsible for generating a technical ...