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Step 1: Preparation of the auxiliary voltage
According to figure 21 a de-activated and re-feeding protected PELV (according to EN 50178) auxilia-
ry voltage source U3 has to be connected to SIPLUS PSU 2 terminals L1/L2. The power supply
should have sufficient power and the current limitation must be adjusted to 60 A.
Before activation it has to be adjusted to a permissible voltage according to chapter 5.3.
NOTICE
Danger of property damage!
The SIPLUS PSU as well as post-connected equipments and voltage sources
may be damaged in case of false polarity.
Please observe the correct polarity before connecting the auxiliary supply.
NOTICE
Danger of property damage!
The power supply may be damaged in case of feeding back.
The used power supply must be re-feeding protected.
Step 2: Load assumption by U3
U3 has to be activated and the voltage has to be adjusted according to chapter 5.3 so that a slight
voltage raise compared with the de-activated U3 can be measured at the X105 resp. X106 terminals.
This shows a reduced current flow through the diode of the SIPLUS PSU 2 and thus an entire supply
of the SIPLUS PSU 2 from U3.
The procedure is described in chapter 8.3 "Checking of the Feeder Diodes" step 2.
Step 3: De-energizing SIPLUS PSU 1
The voltage sources U1 and U2 are deactivated. The SIPLUS PSU 1 is now entirely de-energized
because U3 is blocked by the SIPLUS PSU 2 diodes.
Step 4: Exchange
The leads to the SIPLUS PSU and the fixing screws at the mounting rack can be loosened now and
the equipment can be replaced according to chapter 5.3 "Feeding". Please observe the correct blade
fuses.
Note
Do not reuse bonding means, such as self locking screws or special contact disks for
the assembly at coated and anodized cabinet bars. You have to replace these by new
parts.
Step 5: Restart
After the corresponding installation of the replaced SIPLUS PSU the voltage sources U1 and U2 can
be activated again.
Step 6: Load assumption by U1 and U2
U3 has to be deactivated so that SIPLUS PSU 1 as well as 2 are supplied by the voltage sources U1
and U2.
U3 can be removed afterwards. The replace of the equipment is completed.
SIPLUS PSU Power Supply Unit
Copyright (C) Siemens AG 2018
A5E00854207E
V 8.00 released
SIPLUS PSU (6DL3500-8BA)
28 of 30
2018-05-03
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