Power Supply and Controls

Power Supplies and Controls. Induction heating furnace loads rarely can be connected directiy to the user s electric power distribution system. If the load is to operate at the supply frequency, a transformer is used to provide the proper load voltage as weU as isolation from the supply system. Adjustment of the load voltage can be achieved by means of a tapped transformer or by use of a solid-state switch. The low power factor of an induction load can be corrected by installing a capacitor bank in the primary or secondary circuit. 

When a sensor is used in an appliance, additional components like a low-voltage power supply and control electronics are required. As these components have a big influence on the actual cost price of the product, it is very important that the cost price of the sensor is reduced to the bare minimum, since a lower cost price makes the product more competitive. 

Power Supply and Controls 3.1.3.1 Power Supply Systems... 

Cables associated with emergency power supplies and control systems. 

Only the most sensitive and expensive products are usually freeze-dried. Among these are antibiotics, antitoxins, antisera, certain vitamins, cancer chemotherapy drugs, diagnostic reagents, and other unstable and easily oxidiz-able materials. Because of the high value of the dryer load, they are often equipped with standby vacuum pumps and refrigeration units, as well as a standby electrical power supply and control instrumentation to protect against any failure. 

When costs are compared, the control transformer is competitive because in a single unit the power supply and control transformer exists. 

By eliminating nuclear grade main circulating pumps, their prime movers, associated valves, instrumentation, power supply and control system, the plant is made simpler and easier to maintain as compared to the options involving forced circulation in the main heat transport... 

Design of machinery to facilitate handling > Controls, control systems and control devices > Failure of power supplies and control circuits >- Software... 

The simplified requirements to safety systems (as comes to their scope, capability, operation speed, power supply, and control and monitoring requirements) due to a strong reliance on inherent safety features and the principles of passive actuation and systems operation ... 

Fig. 8.15 A facility for manual electroplating. The modular equipment is suitable for both rack- and barrel-plating. Construction materials include corrosion-resistant PVC-clad steel and stainless steel. Applications include precious-metal plating in the electronics industry. Power supply and control circuitry are located above the tanks. (Courtesy PMD Chemicals Ltd.)...

Not so long ago there were only analog solutions for video interfaces. For power supply and control channels, separate cables were often used. Video was predominately transmitted over a 75-ohm coaxial cable. The analog standards not only determine the cable type and voltage level, but also the frame rate, number of lines, the duration of a line and the type of modulation for color information. 

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