Phoenix Contact CSS 1.5-1/3-EMC Handleiding (152 Pagina's)

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5.5.2 Grid types

Symmetric ground system

NOTE:

If you remove the IT plug-in bridge, the CONTACTRON Speed Starter is no longer

EMC compatible.

You have to make sure to observe the local EMC standards.

In a symmetrical grounding power system, you have to use the IT plug-in bridge to

maintain the effect of the built-in EMC filter and surge protective device.

Figure 5-9 Symmetrical grounding power system

Floating ground system (IT system)

A floating ground system is also called an IT system, an ungrounded system, or a high

impedance/resistance (greater than 30 Ω) grounded system.

– Remove the IT plug-in bridge to disconnect the ground cable from the internal filter

capacitor and surge protective device.

– Do not install an external RFI/EMC filter. The external EMC filter passes through a

filter capacitor and connects power input to the ground. This is very dangerous and

damages the CONTACTRON Speed Starter.

– In situations where EMC is required, use an EMC filter specifically for IT systems if

necessary. Disconnecting the ground cable from the filter prevents damage to the

CONTACTRON Speed Starter, but compliance with EMC is no longer guaranteed.

– If EMC is required, check for excess electromagnetic radiation affecting nearby

low-voltage circuits. In some situations, the adapter and cable naturally provide

enough suppression. If in doubt, install an extra electrostatic shielded cable on the

power supply side between the main circuit and the control terminals to increase

shielding.

L2

L3

L1

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