A 75kw induction motor was being used to control air movement in an oven. The fan was being run at full speed, regardless of the requirements of the process with the air flow in the oven controlled by a butterfly valve.
The valve controlled the air flow from the fan as required, without reducing the energy required to run the fan motor, a highly inefficient system that wasted a significant amount of energy.
Rotor Technical Services Ltd supplied and commissioned a Variable Speed Drive (VSD) by IMO Jaguar. The new system was integrated into the existing oven control system, controlling the fan speed instead of controlling the air flow by the butterfly valve. The speed of the fan has been significantly reduced, resulting in reduced energy usage and therefore improving efficiency.