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Frequency Converters (50:60hz)

A frequency converter, converts alternating current (AC) from one frequency to another.

Aerospace / Aircraft Ground Power Units (400hz)

When parked on the ground an aircraft cannot use the normal 50Hz mains power as it needs 400Hz power.

Lift Power Systems

These purpose built systems are designed to supply power to emergency evacuation lifts.

Uninterruptible Power Supply (UPS) Systems

An uninterruptible power supply (UPS) system provides power to a critical load.

Variable Speed Drives

Adjustable speed drive (ASD) or variable-speed drive (VSD) describes equipment used to control the speed of machinery.

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?

Variable Speed Drives (VSDs) or Adjustable Speed Drives (ASD) are pieces of equipment that help to control the speed of machinery. VSDs and ASDs can be vital – many industrial processes need to operate at varying speeds, depending on the product.

Variable Speed Drives are most typically used in pumps, compressors and fans, but can also be applied to many other types of equipment. There are many benefits to using VSDs and ASDs, including a rise in productivity and a saving in energy.

“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)

Power Systems International Limited was established in the UK in 1986 and the name was chosen as a strong brand name recognising its position in both the international markets where operated and the total reliability of power products demanded for critical loads of all types.

ISO 9001:2015 Certified

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