Variable Speed Drive Solutions

Variable speed drives (VSDs), also known as variable frequency drives (VFDs), control the speed and torque of AC motors by adjusting the frequency and voltage of the power supply. They are one of the most effective tools for reducing energy consumption, improving process control, and extending equipment life in motor-driven systems.

Technical Solutions designs, supplies, installs, and commissions VSD systems for new installations and retrofit applications.

Motor Control

• Speed control for pumps, fans, compressors, conveyors, and other motor-driven equipment
• Soft-start capability — eliminating high inrush currents and mechanical shock during motor starting
• Precise torque control for demanding industrial processes
• Multi-motor coordination and synchronisation
• Forward/reverse operation with controlled acceleration and deceleration

Energy Savings

VSDs deliver significant energy savings in applications where load varies:

• Pumps — reducing speed by 20% can reduce energy consumption by approximately 50% (affinity laws)
• Fans and blowers — matching airflow to actual demand instead of throttling at full speed
• Compressors — adjusting output to process requirements
• HVAC systems — optimising chiller and air handling unit performance based on actual cooling demand
• Energy savings of 20-60% are achievable in typical variable-load applications

Pumps and Fans

Pump and fan applications represent the largest opportunity for VSD-based energy optimisation:

• Replacing throttle valves and dampers with speed control
• Eliminating bypass circuits and wasteful recirculation
• Maintaining constant pressure or flow with variable speed instead of on/off cycling
• Reducing water hammer and pressure surges through controlled speed changes

System Design and Retrofit

Technical Solutions provides complete VSD system engineering:

• Motor-drive matching — selecting VSD ratings compatible with existing motor characteristics
• Harmonic assessment — evaluating the impact of VSDs on the electrical network and specifying mitigation where required
• Cable and protection — EMC-compliant cable selection, motor cable length considerations, and circuit protection
• Control integration — connecting VSDs to existing PLC, SCADA, or building management systems
• Commissioning — parameter configuration, motor auto-tuning, and performance verification
• Retrofit planning — integrating VSDs into existing installations with minimal disruption to operations

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