Chapter 7 Earthing and Shielding
GFK-2958E
RSTi-EP User Manual
332
7.2
Potential Ratios
7.2.1
Basic aspects
As regards the potential ratios of a RSTi-EPsystem, the following aspects must be kept in mind:
•
The power supply of the network adapter and I/O modules as well as field power is provided
via the power supply at the power-feed module (PF)
•
A potential-free design is made possible through the use of an isolated power supply at the
system power supply and the field power supply
The block diagram shows the typical design of a RSTi-EP system. The power supply concept here
makes sure that, starting with a certain capacity utilisation, power refresh is implemented using
power-feed modules.
RSTi-EP Power Supply Concept
7.2.2
Potential-free Design
In a potential-free design, the reference potentials of control and load circuits are galvanically
isolated from each other. A potential-free design is necessary for the following:
––
Use of the power-feed module (EP-19xx), i.e. in all AC load circuits
––
DC load circuits that cannot be coupled
Potential-free installation depends on the type of earthing.
Summary of Contents for RSTi-EP
Page 1: ...RSTi EP User Manual GFK 2958E November 2017...
Page 23: ...Chapter 1 Introduction GFK 2958E RSTi EP User Manual 19 Notes...
Page 56: ...Chapter 3 Configuration GFK 2958E RSTi EP User Manual 52 Notes...
Page 183: ...Chapter 5 Detailed Descriptions of I O Modules GFK 2958E RSTi EP User Manual 179 EP 5111...
Page 184: ...Chapter 5 Detailed Descriptions of I O Modules GFK 2958E RSTi EP User Manual 180 EP 5111...
Page 316: ...Chapter 5 Detailed Descriptions of I O Modules GFK 2958E RSTi EP User Manual 312 Notes...
Page 330: ...Chapter 6 Installation GFK 2958E RSTi EP User Manual 326 Notes...
Page 344: ...Chapter 7 Earthing and Shielding GFK 2958E RSTi EP User Manual 340...
Page 345: ...Chapter 7 Earthing and Shielding GFK 2958E RSTi EP User Manual 341 Notes...
Page 385: ...Chapter 8 Web Server GFK 2958E RSTi EP User Manual 381 Notes...
Page 401: ...Chapter 11 Disassembly and Disposal GFK 2958E RSTi EP User Manual 397 Notes...
Page 413: ...Chapter 12 LED Indicators and Troubleshooting GFK 2958E RSTi EP User Manual 409 Notes...
Page 416: ...Chapter 14Accessories and Replacement Parts GFK 2958E RSTi EP User Manual 412 Notes...