Variable Speed Drives

RANGE OF VARIABLE SPEED DRIVES

PSI supply a range of variable speed drives to suit a variety of applications. Up to 90kVA power range, we can often recommend the perfect solution to suit your requirements.

VSD-PE100COST EFFECTIVE, COMPACT AND HANDY
  • POWER RANGE: 0.5kVA to 2.5kVA
  • INPUT VOLTAGE: 200V TO 230V SINGLE PHASE
  • OUTPUT VOLTAGE: 200V TO 230V 3 PHASE
  • FREQUENCY RATINGS: 0 TO +/- 400HZ
  • IP20
  • RFI Filter and optional Modbus RTU communications
VSD-PE300HIGH PERFORMANCE
  • POWER RANGE: 0.5kVA to 30kVA
  • INPUT VOLTAGE: 200V TO 240V Single Phase or 3 Phase / 380V to 480V 3 Phase
  • FREQUENCY RATINGS: 0 TO +/- 400HZ
  • IP20 or IP66
  • BUILT-IN EMC FILTER AND COMPLIANT WITH
  • INTERNATIONAL STANDARDS
    BUILT-IN SAFE TORQUE OFF (STO) AND REDUNDANT INPUT CIRCUIT
  • Specific for heavy-duty applications that require high starting torque and precise control.
VSD-PE500OUTSTANDING CONTROL FEATURES
  • POWER RANGE: 0.7kVA to 90kVA
  • INPUT VOLTAGE: 200V TO 240V Single Phase or 3 Phase / 380V to 480V 3 Phase
  • FREQUENCY RATINGS: 0 TO +/- 400HZ
  • IP20 or IP66
  • EMC and harmonic filters integrated across the range, optional dV/dt filter

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Where the speed drives are really useful?
ENERGY SAVING!

Fans

Reducing the speed of the fan is a much more energy efficient way than dampers to regulate the output of fans.

PUMPS

Using a variable speed drive to control the pump rather than using simple throttle control can result in significant power SAVING.

AIR COMPRESSORS

The potential for energy savings from using VSDs for air compressors will depend on the control system being replaced.

What is a Variable Speed Drive – VSD?

Adjustable speed drive (ASD) or variable-speed drive (VSD) describes equipment used to control the speed of machinery. Many industrial processes must operate at different speeds for different products.

Most motors are designed to operate at a constant speed and provide a constant output; however, modern technology requires different speeds in many applications where electric motors are used.  Effects of applying VSDs are in both productivity improvements and energy savings in pumps, fans, compressors and other equipment.

“VSDs enhance process operations, particularly where flow control is involved. VSDs provide soft-start capabilities, which decrease electrical stresses and line voltage sags associated with full voltage motor start-ups, especially when driving high-inertia loads.” (S.S. Turkel)

Differences between a variable frequency drive (VFD) and a variable speed drive (VSD)

A variable frequency drive (VFD) refers to AC drives only and a variable speed drive (VSD) refers to either AC Drives or DC Drives. VFDs vary the speed of an AC motor by varying the frequency to the motor. VSDs referring to DC motors vary the speed by varying the voltage to the motor.

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