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...
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