The load can also be switched via a contact.Connection of input/outputmodules to two power supplyunitsGiven here are two examples of the feeding of inputs and outputs ofdifferent modules from two power supply units.With non-floating input/output modules, the negative terminals (L-) ofthe power supply units are connected to reference potential (PE)because the inputs of the 420 module are referred to chassis ground.Output 1 Output 2ELRPhase (L)Manu-LoadNeutral (N)ELR = Electronic Load RelayELR alFigure 8-11 Parallel Connection of Outputs for AC Voltage OutputsReference Potential++DQe.g. 4410 V++DQe.g. 4410 V0 Ve.g. 420DI0 Ve.g. 420DI2 L +1 L +I I I I I I I I IAC230 VDC24 V+_+_AC230 VDC24 VL _QL Q LQ QQ QL Q QLCentral Ground Pointor Rackof the CC/EUandConnectionto ProtectiveConductor (PE)Figure 8-12 Feeding of Non-Floating Input/Output Modules from Two Power Supply UnitsInstallation and StartupSystem Manual8 - 26 C79000-B8576-C199-03
