3UF5 SIMOCODE-DP System Motor Protection and Control Device

The 3UF50 Basic UnitVoltage supply• internal 24 V DC supply, if you are using mechanical contacts• external 24 V DC supply, if you are using solid-state sensors (e.g. limit switchesfor level measurements). Input 1 is the reference potential, i.e. threeinputs are available to you.• external 24 V DC, if you are using mechanical contacts. A2 is the referencepotential, i.e. there are four inputs available (only 24 V DC versions of theunit).In1 .2 .3 .41 2 3 4 5Possible input circuitryfor all AC / DC versions of the unitInput circuitry with internal24 V DC (pulsed)Buffering 20 ms+_In1 .2 .3 .41 2 3 4Input circuitry with external24 V DC.+_A1A2In1 .2 .3 .41 2 3 4Possible input circuitryfor 24 V DC versionsInput circuitry with external24 V DC (pulsed)All four inputs can therefore beused.Fig. 15: Diagram of input circuitryNoteThe internal 24 V DC voltage supply must be used for the inputs of the BasicUnit only.Cable lengthsFurther information about cable lengths is given in the appendix,page C-5.2-6 GWA 4NEB 631 4286-02a