VDF and Softstarter


A variable-frequency drive (VFD; also referred to as an adjustable-frequency drive, variable speed drive, AC drive, micro drive or inverter drive) is a used in electro-mechanical drive systems to protects and controls the speed and torque by varying motor input frequency and voltage.

A VFD can control the speed of the motor during the start and stop cycle, as well as throughout the run cycle. VFDs are used in applications where complete speed control is required, energy savings is a goal and custom control is needed.

VFD's can save a lot of energy. And they are good at reducing peak energy demand or reducing power when not required. They offer fully adjustable speed (pumps, conveyors, and fans) and can control starting, stopping, and acceleration. they have dynamic torque control and they provide smooth motion for applications such as elevators and escalators. They can maintain speed of equipment, making them ideal for manufacturing equipment and industrial equipment such as mixers, grinders, and crushers. They have self-diagnostics and communications, advanced overload protection, PLC-like functionality and software programming, digital inputs/outputs (DI/DO), analog inputs/outputs (AI/AO) and relay outputs.

Brands we deals with
  • ABB
  • Danfoss/Vacon
  • Siemens
  • Schneider Electric
  • Leroy Somer
  • Invertek


A Soft starter is a device used with AC electrical motors to temporarily reduce the load and torque in the power train and electric current surge of the motor during start-up. This reduces the mechanical stress on the motor and shaft, as well as the electrodynamic stresses on the attached power cables and electrical distribution network, extending the lifespan of the system.

Soft starters are used in applications that require speed and torque control are required only during startup (and stop if equipped with soft stop) or where there is a need to reduce large startup inrush currents associated with a large motor is required. They are also used when the mechanical system (the load) requires a gentle start to relieve torque spikes and tension associated with normal startup (for example, conveyors, belt-driven systems, gears, and so on). And they are used for pumps to eliminate pressure surges caused in piping systems when fluid changes direction rapidly.

Electrical soft starters temporarily reduce voltage or current input by reducing torque. Some soft starters may use solid-state devices to help control the flow of the current. They can control one to three phases, with three-phase control usually producing better results. Most soft starters use a series of thyristors or silicon controlled rectifiers (SCRs) to reduce the voltage. In the normal OFF state, the SCRs restrict current, but in the normal ON state, the SCRs allow current. The SCRs are engaged during ramp up, and bypass contactors are pulled in after maximum speed is achieved. This helps to significantly reduce motor heating. Soft starters are often the more economical choice for applications that require speed and torque control only during motor startup. Additionally, they are often the ideal solution for applications where space is a concern, as they usually take up less space than variable frequency drives.

Brands we deals with
  • ABB
  • Danfoss
  • Schneider Electric
  • Control Techniques
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