As a result, eight ABB industrial drives, five ABB general purpose drives and low voltage ABB motors, rated from 0.75 kW to 250 kW were installed during a two week phase, part of which was the plant’s shutdown period. The equipment was selected as the incumbent drives supplier is not able to offer a drives and motors matched pair.
Following the installation, further measurements were taken and a 20 percent drop in energy consumption was observed. The results showed that by changing to AC drives, Weetabix has saved some £28,000 per year, with a payback within three years.
From an engineering perspective Weetabix have eliminated maintenance on the drive train, as there are no carbon brushes to replace, no forced cooling, and feedback devices are eliminated as the gearboxes are protected by implementing a torque limit control on the AC drive. It is estimated that engineering maintenance cost and plant downtime are reduced amounting to nearly £20,000 per year. This provides an overall estimated cost saving of £48,000 per year.