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...

Products & Services
Motor Controllers
Motor controllers receive supply voltages and provide signals to motor drives that are interfaced to motors. They include a power supply, amplifier, user interface, and position control circuitry.
Motor Speed Controllers
Motor speed controllers are electronic devices that control motor speed. They carry specifications for drive type, product classification, electrical ratings, and operating parameters.
Frequency-to-Current Converters
Frequency-to-current converters accept a frequency (an AC signal) and produce an output current whose value is a function of the input frequency.
Encoder and Resolver Signal Conditioners
Encoder and resolver signal conditioners accept encoder and resolver measurements and convert or condition these signals into digital data or suitable levels. 
Motion Controllers
Motion controllers range from simple linear controllers to complex, user-programmable modules that act as controllers within complex integrated multi-axis motion systems.

Topics of Interest

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...

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