BOOK_CONTENT
From Motors & Drives: A Practical Technology Guide
AC Contactor
Designed for the specific purpose of establish or interrupting an AC power circuit. A contactor is a high power, electromagnetic switch. It is constructed of a low voltage "control circuit" (for example, 24VDC) and a "power circuit," where the high voltage is being controlled (for example 460VAC, 3-Phase). A contactor is essentially a high power relay.
AC Drive
An electronic device that converts a fixed frequency and voltage source to an adjustable frequency and AC voltage source. It controls the speed, torque, horsepower, and direction of an AC motor.
A/D Converter
A device that converts an analog signal (continuous values of voltage or current, e.g., sinewave) to a digital number.
Adjustable Speed
Varying the speed of a motor, either manually or automatically. The desired operating speed (set speed) is relatively constant regardless of load.
Adjustable Speed Drive (Electrical)
An adjustable-speed drive consists of the motor, drive controller, and operator's controls (either manual or automatic).
Analog Input (AI)
An analog input is an input for the user-supplied DC signal. The signal may be a speed reference or a process feedback. This signal can be from manual speed pot DC voltage (0 to 10 VDC) DC current (0 to 20 mADC). For many drives, the abbreviation is AI.
Analog Input Module
An I/O module that converts an analog signal from an analog measuring device that may be processed by the processor.
Analog Output Module
An I/O module that converts a digital signal from the processor into an analog output...
Copyright ISA - The Instrumentation, Systems, and Automation Society 2003 under license agreement with Books24x7

Products & Services
Copper, Brass, and Bronze Alloys
Copper, brass, and bronze alloys are non-ferrous metals with excellent electrical and thermal conductivity as well as good corrosion resistance, ductility and strength.
Anodes
Anodes are consumables used in a variety of electrochemical processes such as corrosion protection (sacrificial anodes) and electroplating (plating anodes).
Nonferrous Metals and Alloys
Nonferrous metals and alloys are non-iron-based metals or alloys used for a wide range of applications.
Bonded Seals
Bonded seals are metal washers with a rubber insert bonded to the inside diameter for use in high pressure applications.
Studs
Studs are mechanical fasteners which are threaded on one or both ends. One end is secured to an object. The other end is used typically with a nut.

Topics of Interest

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