The Drive Control System (DCS) usually works with revolution encoders and manually entered roll diameters. Entering even just one of those diameters incorrectly can lead to expensive problems:
damaged sheet surface, resulting in poor printability
excessive canvas wear due to poor transfer of drive power
numerous sheet breaks, ruining the machine’s runnability
With its many different positions, the drying section requires a high quality DCS. Due to shrink and elongation of the web, each position needs its own running speed. Too much drag between two positions will break the sheet; too little drag causes wrinkles or fluttering.
Feltest Products for accurate speed measurements
Feltest RealSpeed– an accurate tachometer, specially designed for paper machines.