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    ABB Drives (ACS-510-01): How to process two 4-20mA signals for speed control with minimum to no additional device.

    I need to process two 4-20 mA signals from two pressure differential sensors (Dwyer MS-121-LCD) and average them so that their average will be the final signal to be translated as frequency (Max 60 Hz) in ABB ACS-510-01 VFDs in order to provide a pressurized air in stairwells for emergency...