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Warp let-off system has a frequency converter, which is intended for letting off from warp beam or feeding unit. The drive is mounted either on the weaving machine or on a frame positioned behind the weaving machine. The let-off starts with a machine running signal; the speed of the let-off motor is controlled by a proximity switch mounted on the whip roller system and an internal speed memory. An alarm signal switches the weaving machine off in case of over tightened warp or any other error.
Illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted to correlate with human brightness perception.