TerminalsID Label Element Purpose1 Protective conductor terminal for PSU module and housing.2 Strain reliefs for connecting cables, with metal contact surface forcable shields.3 DC Line ScrewterminalsSystem connection, 24 V input voltage4 Monitor Output RelayoutputStandstill of one or both fans is signalled via LED and relay contact tothe exterior, and results in shutdown of output voltages (can be shutdown via jumper F-R of the PSU; then only relay signal and LEDindication).5 Enable PowersupplyInput/outputNo voltage at the EN input results in shutdown of the PSU. Not morethan 7 EN inputs may be driven with one UH output (front terminal).6 DC 24 V; 0.4 A Output This output can be used to power the enable inputs of the U Periphery.7 Ext.Batt. 3.4 V Sockets Sockets for external 3.4 V backup voltage.CautionObserve the appropriate VDE specifications, especiallyVDE 0100. The terminals at the front are suitable for a conductorcross-section of up to 4 mm2 , solid, or 2.5 mm 2, flexible. Ensureadequate strain relief of the connections.15 V auxiliary submodule You can add a 15 V auxiliary submodule to the 6ES5 955-3NA12power supply unit (e.g. if you wish to use SINEC H1). The auxiliarysubmodule produces a stabilized 15 V output voltage from the 24 Voutput voltage. The auxiliary submodule is short-circuit protected.The output voltage is monitored. If the voltage is too low, the green"15/24 V o.k." LED on the front plate goes off. If the voltage is toohigh, the output is short-circuited by a thyristor.1 2 2 2 23 4 5 6 7DC Line5V DC 24V DC 0,4A15V/24VDCMonitor Output BatteryEnablePower supply24V DC+ -L+ MDisconnectbefore removingpower supply!46ES5 955-3NA12 Power Supply UnitSystem ManualC79000-B8576-C199-03 4 - 71
