Earthing Concept; Protective Equipment; Checking Of The Feeder Diodes - Siemens SIPLUS PSU Operating Instructions Manual

Table of Contents

SIPLUS PSU (6DL3500-8BA)

4.8 Earthing Concept

The reference potential of the cabinet feeding (M feeding terminals) is electrically connected to the

metal housing of the SIPLUS PSU internally. The connection between M potential and cabinet earth

is established by mounting the PSU at the cabinet rack.

For use of the SIPLUS PSU in plants with central earthing point the internal connection between M

potential and unit casing can be disconnected.

The chapter 7 "Commissioning" contains more information about the professional mounting.

Device internal electronics is protected by Suppressor diodes from surge at every supply output and

signaling output.

EMC capacitors at supply outputs X1-X20 increase the electromagnetic compatibility of the cabinet

supply.

The short circuit and overload protection is described in the chapter 4.5 "Monitoring and Signaling".

The diodes for the redundant feeding of the supply potential L1 resp. L2 can be checked in online

operation without interrupting the voltage lines at the supply outputs. For this purpose the supply po-

tential L1/L2, that is wired-or connected from L1 and L2, is provided at a screw terminal (X109) (see

figure 3 and figure 4).

The screw terminal L1/L2 (X109) is dimensioned for wire cross-sections according to chapter 5.3

"Feeding".

The procedure for checking the feeder diodes is described in detail in the chapter 8 "Maintenance

and Diagnosis".

SIPLUS PSU Power Supply Unit

A5E00854207E

14 of 30

V 8.00 released

2018-05-03

Table of Contents