Momentum
Structuring Your Power Supply System Overview This section contains guidelines for planning and wiring your power supply system. Use Separate Power Supply for Outputs Operating voltage and input voltage can be derived from one power supply (PS). We recommend that the output voltage be drawn from a separate power supply (e.g., 10 A or 25 A, referred to as PS1 and PS2). A separate output voltage supply prevents interferences caused by switching processes from affecting the voltage supply to the electronics. Where larger output currents are involved, provide additional power supplies for the output voltage (PS3, ...). Use Star Configuration
CAUTION POTENTIAL FOR SHORT CIRCUITS AND/OR POWER-UP/POWER-DOWN SPIKES Provide external fuses on the operating voltage to protect the module. Appropriate fuse values are shown in the wiring diagrams. An unprotected module may be subject to short circuits and/or power-up/power-down spikes. Failure to follow these instructions can result in injury or equipment damage. Each I/O base should be fed by the power supply in star configuration, i.e., separate leads from the power supply to each module. Avoid Induction Loops Do not create any induction loops. (This can be caused by laying out the supply conductors L+/M, ... in pairs.) As a remedy, use twisted-pair wiring. Avoid Series Connections The series connections often found in automatic circuit breakers should be avoided since they increase the inductive component in the output-voltage leads. Potential-Isolated Fieldbus Islands The potential relationships of the bus adapters are designed so that the individual I/O stations form potential-isolated islands (e.g., by isolating the incoming remote bus of InterBus). To decide whether potential balancing is necessary, refer to the installation guidelines of the used communication adapter.
178
33002439 10/2019
