Cable, electrical, foam pipe / Electro-technical equipment

Induction motor control stations are low voltage electrical switchboards. They ensure complex protection and control automation according to set-up process variables, including smooth start, reverse, smooth stop and control of speed and torque in the given range on the shaft of one or several three-phase induction motors, including their cascade ignition using frequency converters.

Basic operating principle is based on motor torque control by means of interconnected voltage control in induction motor stator subject to frequency variation of alternating current applied to it. Motor can operate with speed of 0 to rated speed for which it is designed. It is important, as in some cases it is necessary to variate drive rotational frequency in the course of time or hold technological process parameters accurately, maintaining the target speed of processing plant mechanism.

Control stations perform functions of motor and mechanism control and protection against inadmissible operating conditions as well as functions of integration into computer-aided manufacturing (CAM). These functions are mostly used in construction, food, chemical and petroleum industries for centrifugal mechanisms, pump units, fans, compressors, conveyors and machine drives. 

Advantages of control stations:

-Due to motor inrush current limitation, supply main voltage surges and dips are eliminated, thus electromechanical and heat loads on conductors and their insulation are decreased. Drive ceases to effect the other devices connected with the mains used.

-Frequency converter controlling the electric motor can maintain process variables at the set level without using other drive rotational speed control methods, thus it ensures the ease of use, maintenance and operation and makes it possible to improve the quality and expand the range of control, not to speak of economy and reliability of the device operation. 

Control stations constitute economic solution which enables to:

-decrease mechanism operation cost by reduction of mechanical wear and improvement of equipment availability;

-decrease mechanism operation cost by optimized power consumption (energy saving of up to 60%) and due to considerably more comfortable operation;

-minimize probability of pressure wave origination during startup of fans and pumps and eliminate probability of pipeline break;

-decrease load on reduction gears, belts, bearings;

-decrease risk of product damage on conveyor during its startup and stop;

-reduce motor startup influence on supply mains due to current surge and voltage dips in the mains;

-provide functions of local automation and integrate control stations into complex Automated Control Systems.

Typical control station is a wall or floor-mounted metal cabinet of the required IP as per GOST 14254-96 with unilateral maintenance. Cabinet design provides easy access to components during mounting and setup.

Subject to typical circuit, the cabinet is provided with switches, protection devices, automation devices and frequency converters themselves and soft starters fabricated by leading world-wide manufacturers Danfoss, Vacon, ABB, Schneider-Electric, Siemens, etc.

From the front of the cabinet door there are control and warning elements such as protection reset button, electric drive startup and stop command button, supply mains power voltage indicator, alarm fittings "Readiness", "Startup" or "Forward", "Backward", "End of startup", "Overload", "Emergency", mode selection switches, ammeters, remote terminal, automation module terminal (HMI), etc.

Input and output cables of power circuits can be located at the bottom or at the top of the cabinet. In-house floor-mounted or hinged cabinets are used as load carrying structures.

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