Momentum
Grounding Momentum Devices Overview This section describes how to provide two types of grounding for assembled Momentum devices: functional earth (FE), used to discharge high frequency disturbances, guaranteeing proper EMC behavior protective earth (PE), used to protect against personal injuries according to IEC and VDE
Grounding Momentum Devices Momentum devices consist of an I/O base assembled with a communications adapter or a processor adapter and possibly an option adapter. The PE of the adapters is electrically connected with the PE of the I/O base; you do not have to provide any further grounding of the adapter. Grounding Guidelines Follow these guidelines. Be sure you establish good ground contacts. Connect the grounding screw to protective earth (PE) for AC and DC modules with a recommended maximum torque of 4.4 in/lb (0.5 Nm) using a PZ2 driver.
Cable Specifications When you are using ground cable up to 10 cm (4 in) long, its diameter should be at least 12 AWG (or 2.5 mm2). When longer cables are used, larger cable diameters are required, as shown in the following illustration.
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