Why VSD?
A Variable Speed Drive (VSD) is an electronic control device used to regulate the speed and torque of an electric motor by adjusting the frequency and voltage supplied to the motor. It enables precise control of motor performance to match process requirements, improving system efficiency and operational flexibility.
Reduce requirement of operation
A VSD significantly reduces the starting current of a machine by gradually increasing the voltage and frequency during startup. This reduces the strain on both the machine and the electrical system, prevents voltage drops, and puts less demand on the local power grid.
A = % full load current
B = Seconds
1 = Direct Online starter
2 = Star Delta
3 = Soft starter
4 = VSD
Increase machine efficiency
VSD automatically adjusts the booster’s operating speed to match production of compressed O2 to demand in real time. VSD is designed for operations where application requirement fluctuates, such as facilities that operate different processes or multiple shifts so flow demand increases and decreases throughout the day.
Unlike fixed speed machines which always run at full capacity and waste energy when machine is at unload situation, VSD motors can adjust their speed to the load. This results in substantial energy savings, often 20–50% or more.
A = Air demand
B = Time
1 = Energy consumption fixed speed load/unload
2 = Energy consumption VSD
3 = Air demand
Increase machine reliability
VSD helps reduce a booster’s load/unload cycles and even its start/stop frequency by continuously adjusting the motor speed to match the required air demand. Instead of frequently switching between load and unload or starting and stopping to maintain pressure, the VSD enables smooth, continuous operation. This minimizes mechanical stress and reduces wear on components, also extends the booster’s lifespan.
A = Frequency of load/unload
B = Flow ratio*
1 = Fixed Speed Drive
2 = VSD (OGB)
* = demanding flow/ max flow
