Control panel

Figure 13.5 A typical mimic-cum-process control panel (Courtesy ECS)

Think of the pump curve like the dashboard or control panel of a car. No one would operate a car without the dash instrumentation panel. 

For a ready reference to the readers, we provide power and control scheme diagratns, usually required in day-to-day use. while wiring an MCC or a control panel, or ttiaintenance at site. 

Fig. 1 The view of the polar display with monitors arcs and control panel for SFT6000N board parameters. Recorded signal is from the eddy current probe moved along in a brass tube of inner diameter 20 mm with 2 mm holes as artificial flaws. SFT6000N card operates with 40 kHz injection voltage firequency.

Figure 23.37 A power schematic drawing for an automatic capacitor control panel

For instrument modules, relay and control modules or control panels or all power modules, where an interlock with the door is not possible or is not provided, a proper shroud or shutter must be provided on all exposed live parts rated above 240 V. 

Consider ergonomics in the design of displays and control panels. 

The information on the dash panel is located right in front of the eyes of the operator of the ear. It s a shame that most pump operators don t have their control panel (the curve) before their eyes, or even within reach, as they operate the pumps. This is the source of many problems with pumps. 

In the final analysis, pumps should be operated at or near their BEP. These pumps will run for years without giving problems. The pump curve is the pump s control panel, and it should be in the hands of the personnel who operate the pumps and understood by them. 

I Overheating shortens the life of a capacitor. Adequate ventilation and cooling facilities, through convection and radiation, must be made available at the place of installation. When housed inside a cubicle, as in a capacitor control panel and in a tier fonnation. sufficient space must be provided between each unit. Adequate 

The expander is now ready to be put into operation. Open the compressor inlet valve and expander discharge valve simultaneously. Then open the compressor discharge valve. Make sure the variable nozzles are in the closed position. Push the start button on the control panel to open the inlet shutdown valve. 

Electrical. The plant electrical system is sometimes more important than the steam system. The electrical system consists of the utihty company s entry substation, any ia-plant generating equipment, primary distribution feeders, secondary substations and transformers, final distribution cables, and various items of switch-gear, protective relays, motor starters, motors, lighting control panels, and capacitors to adjust power factor. 

An extraction plant should operate at steady state in accordance with the flow-sheet design for the process. However, fluctuation in feed streams can cause changes in product quaUty unless a sophisticated system of feed-forward control is used (103). Upsets of operation caused by flooding in the column always force shutdowns. Therefore, interface control could be of utmost importance. The plant design should be based on (/) process control (qv) decisions made by trained technical personnel, (2) off-line analysis or limited on-line automatic analysis, and (J) control panels equipped with manual and automatic control for motor speed, flow, interface level, pressure, temperature, etc. 

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