Broken tool detection control unit 28420

ELTEX Central Control Unit 28420 for ELTEX logic current signal givers General description The 28420 electronic board is a central control unit used for Eltex signal givers (weft break sensors) with logic current output (E-type). The central control unit compares the signals from the signal giver and the light switch and gives a stop pulse to the weaving machine when necessary. Function and specifications Power supply: 16-30 V DC. (16-24 V DC on units with serial number lower than 90380000) Relay stop output: The relay is normally energized. As soon as a weft fault occurs, the relay will be deenergized. ANTI-function: A weft stop motion with this electronic board and an E2070 or an ANTI signal giver can detect if too many yarns are inserted by mistake. Size: Europe size board, 100 x 160 mm. Models 28420: Europe connector DIN 41612 series F, 32 poles, row b + z. 28421: Europe connector DIN 41612 series D, 32 poles. Fitting: The central control unit is designed to fit in the control box of the weaving machine. On machines where there is no connector available for this unit, use the 28420 unit fitted in the Eltex plastic case 13400. Logic current principle Eltex logic current signal givers are communicating with the central control unit by means of a DC current signal. When one yarn is moving, the signal giver is sending a certain amount of current, and this is called a ”current unit”. The central control unit can be set to detect one or two current units from the signal giver.