acs800 vsd retrofit on Atlas Copco air compressorEDC Air Compressors recently retro-fitted an ABB ACS800 variable speed drive into an Atlas Copco ZT90 vsd air compressor. The successful installation, at a local brewery, took under 5 hours to complete, meaning minimal down-time for the customer. The new ACS800 drive selected for the job is more compact with a smaller footprint than the vsd previously installed -  meaning space was not an issue.