a b c d e f g h i j k l m n o p q r s t u v w x y z #


Drives & MCC

Drives & MCC Control Systems. A motor controller is a device that controls the performance of an electric motor. It might include a manual or automatic means for starting and stopping the motor, selecting forward or reverse rotation, selecting and regulating the speed, regulating or limiting the torque, and protecting against overloads and faults. A motor control center (MCC) groups these motor controllers and related devices in one compact structure. A motor control center consists of one or more enclosed vertical sections mounted on the floor. It contains incoming line facilities, a common horizontal bus, wireway trough, and conduit facilities for incoming and outgoing wires. Each vertical section typically contains a vertical bus connected to the power bus, a vertical wireway, one or more combination motor control units, and various related devices, including push buttons, selector switches, etc.

  • SPEC #: 17656
  • Code: 17-50-06


Electrical Controller. A device that governs in some predetermined manner the electric power delivered to an apparatus or system.

  • SPEC #: 17654
  • Code: 17-50-04


MMI & OIT Control Systems. Man Machine Interface (MMI) and Operator Interface Terminals (OIT) are operator interfaces with which users interact in order to control other devices. Some include knobs, levers, and controls. Others provide programmable function keys or a full key pad. Devices that include a processor or interface to personal computers are also available. Many include alphanumeric or graphic displays. Some are web-enabled. Others include software drivers, a stylus, and support for a keyboard, mouse, and printer. Devices that are designed for harsh environments include enclosures that meet standards from the National Electronics Manufacturers’ Association (NEMA).

  • SPEC #: 17655
  • Code: 17-50-05

Panel Purge System

Purge Panel. Purge panels are designed to automatically flush explosive gases out of the control enclosure by sending a protective gas such as instrument air or an inert gas through the system until enclosure volumes have been exchanged. After the purging cycle is completed, power can be applied to protective enclosure. These panels usually contain controls similar to the following: shatter-proof windows, pressurization valves, regulated and differential pressure gauges, low-pressure alarms, and purge valves.

  • SPEC #: 17641
  • Code: 17-40-01