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SCHNEIDER Drive Price List w.e.f 1st july 2014 (VIEW)  SCHNEIDER Customer Care No:18001030011
Introduction of Drives

A variable-frequency drive (VF DRIVES) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.

VF DRIVESs are used in applications ranging from small appliances to the largest of mine mill drives and compressors. However, around 25% of the world's electrical energy is consumed by electric motors in industrial applications, which are especially conducive for energy savings using VSDs in centrifugal load service, and VF DRIVESs' global market penetration for all applications is still relatively small. This highlights especially significant energy efficiency improvement opportunities for retrofitted and new VF DRIVES installations.

Over the last four decades, power electronics technology has reduced VF DRIVES cost and size and improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.

VF DRIVESs are available in a number of different low and medium voltage AC-AC and DC-AC topologies.

Types of Drives

AC drives can be classified according to the following generic topologies:

  • Voltage-source inverter (VSI) drive topologies (see image): In a VSI drive, the DC output of the diode-bridge converter stores energy in the capacitor bus to supply stiff voltage input to the inverter. The vast majority of drives are VSI type with PWM voltage output.
  • Current-source inverter (CSI) drive topologies (see image): In a CSI drive, the DC output of the SCR-bridge converter stores energy in series-reactor connection to supply stiff current input to the inverter. CSI drives can be operated with either PWM or six-step waveform output.
  • Six-step inverter drive topologies (see image): Now largely obsolete, six-step drives can be either VSI or CSI type and are also referred to as variable-voltage inverter drives, pulse-amplitude modulation (PAM) drives, square-wave drives or D.C. chopper inverter drives. In a six-step drive, the DC output of the SCR-bridge converter is smoothed via capacitor bus and series-reactor connection to supply via Darlington Pair or IGBT inverter quasi-sinusoidal, six-step voltage or current input to an induction motor.
  • Load commutated inverter (LCI) drive topologies: In a LCI drive, a special CSI case, the DC output of the SCR-bridge converter stores energy via DC link inductor circuit to supply stiff quasi-sinusoidal six-step current output of a second SCR-bridge's inverter and an over-excited synchronous machine.
  • Cycloconverter or matrix converter (MC) topologies (see image): Cycloconverters and MCs are AC-AC converters that have no intermediate DC link for energy storage. A cycloconverter operates as a three-phase current source via three anti-parallel connected SCR-bridges in six-pulse configuration, each cycloconverter phase acting selectively to convert fixed line frequency AC voltage to an alternating voltage at a variable load frequency. MC drives are IGBT-based.
  • Doubly fed slip recovery system topologies: A doubly fed slip recovery system feeds rectified slip power to a smoothing reactor to supply power to the AC supply network via an inverter, the speed of the motor being controlled by adjusting the DC current.

Applications of Drives

VF DRIVESs are frequently used to control motors for:

  • Fans
  • Pumps (centrifugal, positive displacement or slurry pumps)
  • Compressors
  • Mills, conveyors, kilns, extruders, lifts

Used in the following industries:

  • Power generation e.g. induced draft fans, forced draft fans, condensate pumps, water supply pumps, .
  • Metallurgy: dusting fans, furnace fans, oxygen-generators of steel production, etc.
  • Oil & Gas, petroleum, petrochemistry: oil transfer pumps, compressors, pumps, etc.
  • Mining: mortar pumps, fans, etc.
  • Water and waste water: water supply pump, etc.
  • HVAC: large air conditioning compressors.

Our Major Brands of Drives are

Schneider Drives , Crompton Greaves Drives