Siemens SIPLUS PSU User manual

SIPLUS PSU
Power Supply Unit 6DL3500-8BA
Operating Instructions A5E00854207E

SIPLUS PSU (6DL3500-8BA)
SIPLUS PSU Power Supply Unit A5E00854207E 2 of 30
Copyright (C) Siemens AG 2018 V 8.00 released 2018-05-03
General and safety information
Copyright
Copyright © Siemens AG 2018 All Rights Reserved
SIMATIC®and SIPLUS®are registered trademarks of the Siemens AG.
Liability disclaimer
We have checked that the contents of this document correspond to the hardware and software de-
scribed. However, since deviations cannot be precluded entirely, we cannot guarantee full consisten-
cy.
The information in this document is regularly checked, however, and the necessary corrections in-
cluded in subsequent editions. Suggestions for improvement are welcome. Technical data are sub-
ject to modifications.
Warning notices
These Operating Instructions contain information which you should observe in order to ensure your
own personal safety, as well to avoid material damage. The notices referring to your personal safety
are highlighted in the manual by a warning triangle. Notices referring only to equipment damage have
no safety alert symbol. Warnings are shown in descending order according to the degree of danger
as follows:
DANGER
indicates that death or serious injury will result if proper precautions are not
taken.
WARNING
indicates that death or serious injury may result if proper precautions are not
taken.
CAUTION
indicates that minor personal injury may result if proper precautions are not
taken.
NOTICE
means that material damage can occur if the appropriate precautions are not
taken.
Note
highlights important information about the product, handling the product, or part of the
documentation that is of particular importance.
In the event of a number of levels of danger prevailing simultaneously, the warning cor-
responding to the highest level of danger is always used. A warning that uses a safety
alert symbol indicating possible personal injury may also include a warning relating to
material damage.

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Qualified personnel
The device/system must only be set up and used in conjunction with this documentation. Transport,
commissioning and operation of the device/system may only be performed by qualified personnel.
For the purpose of the safety information in these Operating Instructions, a "Qualified Person" is
someone who is authorized to energize, ground, and tag equipment, systems, and circuits in accord-
ance with established safety procedures.
Correct usage of Siemens products
Please observe the following:
WARNING
Danger in case of none designated use of the product!
Serious injury may result.
Siemens products may only be used for the applications indicated in the cata-
log and in the relevant technical description. If third-party products and com-
ponents are used, these must be recommended or approved by Siemens. To
ensure trouble-free and safe operation of the products, they must be appropri-
ately transported, stored, assembled, installed, commissioned, operated and
maintained. The permitted environmental and ambient conditions must be ad-
hered to. Notices in the relevant documentation must be observed.
CAUTION
Risk to be burnt!
Burns at the hands by hot surfaces of the equipment’s housing or the heat
sink!
Do not touch the surface of the housing and the heat sink and let it cool down
before an exchange.
Note
For ecologically compatible recycling and disposal of your old device, contact a certifi-
cated waste disposal service for electronic scrap. Please dispose the old device ac-
cording to the local regulations in your country.

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Electrostatic Sensitive Devices ESD
Almost all electronic devices and modules are equipped with highly integrated components or ele-
ments in MOS technology. For technological reasons, these electronic components are very sensitive
to overvoltage and, consequently, to electrostatic discharge.
The short designation for such electrostatic sensitive components/modules is: "ESD", which is the
commonly used international abbreviation ”ESD” (Electrostatic Sensitive Device).
NOTICE
Electrostatic Sensitive Devices ESD can be damaged!
The presence of this symbol on cabinet, rack or packaging labels indicates the
use of electrostatically sensitive devices and thus the touch sensitivity of the
respective modules. When touching the modules these can be damaged. This
can lead to an immediate failure or to a reduction of the life time of the mod-
ules.
Open the packing only at an ESD workplace. Discharge the body of your own
by establishing of an electrical connection to the earth potential before touch-
ing the module.
These modules can be destroyed by voltage and energy far below the limits of human perception.
Voltages of this kind occur as soon as a device or an assembly is touched by a person who is not
electrostatically discharged.
Components which were subject to such overvoltage are usually not recognized immediately as being
defective, because the malfunction does not occur until after a longer period of operation.
When working on the system, the following points must be followed exactly to ensure the safe dis-
charge of electrostatic charges:
∂Before performing any work on the system, create a ground connection by wearing a
wrist band.
∂Always place or work on components on a grounded, conductive surface.
∂Only transport components in suitable protective bags.
Tolerances of the prescribed tightening torques
Note:
If not indicated differently, the tolerances of the prescribed tightening torques in these
operating instructions are ±10 %.

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Contents
General and safety information...................................................................................................2
1List of abbreviation used .........................................................................................................6
2Application ................................................................................................................................7
2.1 Utilization ...............................................................................................................................7
2.2 Functions ...............................................................................................................................7
3Design .......................................................................................................................................8
3.1 Mechanical Structure..............................................................................................................8
3.2 Electrical Structure .................................................................................................................9
3.2.1 Block Diagram...............................................................................................................9
3.2.2 Electrical Terminals .......................................................................................................9
4Mode of Operation..................................................................................................................10
4.1 Feeding................................................................................................................................10
4.2 Sub-Distribution....................................................................................................................10
4.3 Fuse Protection....................................................................................................................10
4.4 Switching off the Supply Outputs .........................................................................................11
4.5 Monitoring and Signaling......................................................................................................11
4.6 Signaling Outputs.................................................................................................................12
4.7 Signaling Scheme ................................................................................................................13
4.8 Earthing Concept .................................................................................................................14
4.9 Protective Equipment ...........................................................................................................14
4.10 Checking of the Feeder Diodes............................................................................................14
5Technical Data ........................................................................................................................15
5.1 Mechanics............................................................................................................................15
5.2 Environmental Conditions ....................................................................................................15
5.3 Feeding................................................................................................................................16
5.4 Supply Outputs.....................................................................................................................17
5.5 Signaling Outputs.................................................................................................................18
6Installation instruction ...........................................................................................................19
6.1 Mounting position, heat dissipation and derating..................................................................19
6.2 Installation into the cabinet...................................................................................................20
6.3 Back-up fuse........................................................................................................................20
7Commissioning.......................................................................................................................21
7.1 Mounting into the instrumentation and control cabinet .........................................................21
7.2 Earthed Mounting.................................................................................................................23
7.3 Unearthed Mounting.............................................................................................................23
7.4 Inactivating of unused supply outputs ..................................................................................23
8Maintenance and Diagnosis...................................................................................................24
8.1 Self-Test Functions ..............................................................................................................24
8.2 Malfunctions.........................................................................................................................24
8.3 Checking of the Feeder Diodes............................................................................................25
8.4 Repair ..................................................................................................................................27
8.5 Replace of an Equipment.....................................................................................................27
9Order Designations ................................................................................................................29
10 Annex.......................................................................................................................................30
10.1 List of Figures ......................................................................................................................30
10.2 List of Tables........................................................................................................................30

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1 List of abbreviation used
AWG American Wire Gauge, coding for wire diameter
BGT Module rack
DC Direct current
DI Digital Input
EU902, EU903, EU905 Product name of FUM module racks of the SPPA-systems
FET Field-Effect-Transistor
FUM Function module of the SPPA module spectrum
H x W x D Height x width x depth
HC High Current
I & C Instrumentation and control
LED Light Emitting Diode
MELD Collective message output active HIGH
MELD_N Collective message output active LOW
PCS7 PC supported automation system S7
PELV Protective Extra Low Voltage according to EN 50178
PLC Programmable Logic Controller
PSU Power Supply Unit
SELV Safety Extra Low Voltage according to EN 60950-1
SIPLUS Siemens brand
SPPA Siemens Power Plant Automation

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2 Application
2.1 Utilization
SIPLUS PSU is a power supply module in electronic cabinets for the feeding and sub-distribution of
the power supply DC 24 V. It was developed especially for use in instrumentation and control cabi-
nets of the Siemens power station instrumentation and control systems SPPA-T2000 and SPPA-
T3000 and the Siemens automation system PCS7. It serves for the protected power supply of cabinet
components like racks, fans, heat exchangers, thermostats, door contacts and cabinet lamps.
Figure 1: SIPLUS PSU
The SIPLUS PSU was designed for the installation into electronic cabinets with 19 inch modular de-
sign. By turning the lateral mounting angles by 180° backwards it can also be screwed to rear as-
sembly walls without problems (see Chapter 7 “Commissioning”).
2.2 Functions
The SIPLUS PSU integrates the following functions in a compact unit:
∂Redundant cabinet feeding power supply DC 24V
∂Separate branch terminals DC 24V for the power supply of an adjacent cabinet
∂20 supply outputs for sub-distribution of the DC 24 V supply within the instrumentation and
control cabinet
∂Fuse Protection of the cabinet sub-distribution
∂Manual switch-off of every single electrical circuit of the cabinet sub-distribution
∂Monitoring and signaling of a blown fuse or detection of a failure
∂Indication of the operating state of all power supply outputs (X1-20) via LED displays
∂Electrical connection of the ground potential M of the cabinet feeding with cabinet ground
∂Disconnection of the earth connection for plants with central earth connection point
∂Flexible installation by lateral assembly brackets with several fixing options
∂Test of the feeder diodes with power supply in operating state

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3 Design
3.1 Mechanical Structure
Figure 2: Physical dimensions of the SIPLUS PSU

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3.2 Electrical Structure
3.2.1 Block Diagram
Figure 3: Block Diagram SIPLUS PSU
3.2.2 Electrical Terminals
Figure 4: Electrical Terminals SIPLUS PSU

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4 Mode of Operation
4.1 Feeding
The 24 V DC power supply is fed in redundantly via four screw terminals L1, L2, 2 x M (X101 –X104).
To keep the voltage drops in the supply lines to the first instrumentation and control cabinet low, wire
cross-sections of 25 mm2up to 50 mm2resp. AWG 6 up to AWG 0 can be attached to the feeder
terminals. For connecting adjacent instrumentation and control cabinets another four screw terminals
2 x M, L1, L2 (X105 –X108) for wire cross-sections of 4 up to max. 16 mm2resp. AWG 12 - 4 are
disposable at every SIPLUS PSU. The feeder terminals and the branch terminals for the adjacent
cabinet are internally linked.
4.2 Sub-Distribution
The redundant supply potentials L1 and L2 feed via two feeding diodes in wired-or connection on a
common potential L1/L2 (X109). Twenty protected outputs DC 24 V (X1-X20) are built from this for
the sub-distribution in the instrumentation and control cabinet. The connection of the cabinet compo-
nents to be provided is carried out at SPPA-cabinets via pre-assembled current supply lines accord-
ing to chapter 5.4 “Supply Outputs”. The supply lines are accomplished with 2 poles (L and M). They
are attached by line plugs to the jacks X1-X20. The connection elements for the power supply lines
are not included in the scope of delivery. However they can be ordered separately.
4.3 Fuse Protection
The supply outputs X1-X20 are protected via blade fuses. The fuses are plugged in fuse holders and
are accessible external for the exchange.
In supply outputs for EU902/EU903/EU905 module racks only slow acting fuses with 15 A rated cur-
rent may be used. When using other fuses the selectivity to the post-connected rack built-in fuses is
not ensured.
In the delivery state all fuse holders are fit with slow acting blade fuses 15 A. Sets of slow acting fuse
links 4 A, 8 A and 15 A can be ordered as spare parts (see chapter 9 “Order Designations”).
In addition the supply outputs have an electronic short-circuit and overcurrent supervision (see chap-
ter 4.5 “Monitoring and Signaling”)
NOTICE
Danger when using unsuitable blade fuses.
Dangerous conditions at the equipment or in the plant may occur in case of
fault.
Only blade fuses with a nominal current of max. 15 A and a nominal voltage of
minimum 45 V may be used (see chapter 9 “Order Designations”).

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4.4 Switching off the Supply Outputs
Every supply output can be switched on and off manually over a channel switch. This channel switch
switches a Smart-FET-transistor which interrupts the electrical circuit. The state of a supply output is
indicated by the channel LED. Green light signals the "ON" state (toggle switch lever in up position).
Yellow light signals the "OFF" state (toggle switch lever in down position). In the “OFF” state the out-
put is in high-impedance mode.
Not used supply outputs can be inactivated by switching the output off and unplugging the fuse. Inac-
tive outputs are signaled by dark LEDs.
The operating states are described in the chapter 4.7 ”Signaling Scheme” in tabular form.
4.5 Monitoring and Signaling
The fuses are monitored on interruption. The monitoring is only active when the supply output is
switched on (operating state "ON"). A blown fuse is signaled by the channel LED with a red continu-
ous light. In addition an accumulative status signal is output at the signaling outputs MELD (active
HIGH) and MELD_N (active LOW).
Figure 5: Channel set-up
No. Meaning
1) Blade fuse
2) Smart-FET-Transistor with electronic monitoring
3) Channel-LED
4) Suppressor-Diode
5) Output capacitor
6) Plug for terminal connection
(see chapter 9 “Order Designations”)
7) Entire channel of a supply output
The Smart-FET-transistors have electronic short circuit and overload supervisions. The electronic
supervision can activate and switch off the output at high short-circuit currents. The short circuit and
overload supervisions are only active when the supply output is switched on (operating state "ON").
An activating of the electronic supervision is signaled by the channel LED with a red continuous light.
In addition at the signaling outputs MELD (active HIGH) and MELD_N (active LOW) a collective sta-
tus signal is output.
1)
2)
3)
6)
5)
4)
7)

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For electronic switching off there are two possible reasons:
-Overload
At overload condition the transistor/Smart-FET switches off thermally. After a short cooling
time the transistor switches on automatically again. This process recurs until there is no more
overload condition or the fuse is blown.
-Low impedance short circuit
The short circuit supervision responds and a clocked current limitation is realized. When the
short circuit is eliminated it is automatically switched on.
If a power supply output channel LED signals a red continuous light in the “OFF” state, then there is
an internal fault. The supply channel is faulty and must not be switched on any more. In addition at
the signaling outputs MELD (active HIGH) and MELD_N (active LOW) a collective message is output.
When a monitoring circuit is activated the supply output concerned goes into the operating state
"FAULT". Fault treatment and reset conditions are described in the chapter 8 “Maintenance and Di-
agnosis”.
The operating states are described in the chapter 4.7 “Signaling Scheme” in tabular form.
4.6 Signaling Outputs
When a monitoring facility in a supply output is activated a collective message is output. The signal is
provided at two signaling outputs via the plug connector X21. The signaling output MELD provides a
HIGH active signal DC 24 V/0.5 A. The signaling output MELD_N provides a LOW active signal
DC 24 V/0.5 A.
The signaling outputs are short-circuit-proof and overload-proof against M and DC 24 V. After remov-
al of the short-circuit or overload condition, the outputs resume their function automatically. By means
of suppressor diodes they are protected against positive and negative overvoltage.
Note:
In order to connect the signaling outputs in wired-or with other digital DC outputs, both
outputs are high-impedance in the inactive condition. Therefore the MELD output must
be charged with a pull-down resistor against M and the MELD_N output must be
charged with a pull-up resistor to DC 24 V1
To match the specified signal levels in the inactive state, the pull resistors must not exceed 100 kΩ.
At wired-or connection with other digital DC outputs the pull resistors have to be more low-impedance
according to the specification of these outputs. Example: Wired-or connection with a second digital
DC output. The second output requires a pull resistor of 39 kΩ. The pull resistor is the parallel con-
nection of 39 kΩand 100 kΩand results in 28 kΩ.
1or with current drawing digital DC inputs (MELD) and current sourcing digital DC inputs (MELD_N) respectively

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4.7 Signaling Scheme
The states of the supply outputs are signaled by channel LEDs.
LED - Display State of
operation
Switch
position Fuse Output condition (X1…X20)
MELD
(X21)
MELD_N
(X21)
dark „INACTIVE“ OFF Unplugged High impedance Low High
yellow „OFF“ OFF OK High impedance Low High
green „ON“ ON OK DC 24 V Low High
red „FAULT“ OFF/ON OK/blown High impedance High Low
Table 1: Signaling scheme
The operating state "FAULT" is described in detail in the chapter 8.2 “Malfunctions”.

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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.
4.9 Protective Equipment
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”.
4.10 Checking of the Feeder Diodes
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”.

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5 Technical Data
5.1 Mechanics
Housing sheet steel, sendzimir galvanized
Dimensions H x W x D 159 mm x 484 mm x 130 mm
Weight 5.0 kg
Screws for fixing the mounting angle at the rack
Thread M6
Strength category 8.8
Tightening torque approx. 10 N m (depends on mounting frame) 2
fixing dimensions DIN 41494
Screws for fixing the mounting angle at the SIPLUS PSU housing
Thread M6
Strength category 8.8
Tightening torque 6 N m
Screw for fixing the contact shell between M-potential and housing
Thread M6
Strength category 8.8
Tightening torque 6 N m
5.2 Environmental Conditions
Ambient temperature (up to 35 A) 0 °C to +60 °C 3
Ambient temperature (up to 60 A) 0 °C to +40 °C
Heat flow natural convection according to chapter 6
Transport and storage temperature -40 °C to +70 °C
Degree of protection IP20 according to DIN EN 60529
Mixed gas test according to DIN EN 60068-2-60, Ke, Method 4
Degree of pollution 2 according to VDE 0110
Overvoltage class 3 according to VDE 0160
Conditions in operation and storage according to EN 60721-3-3, stationary, weather
protected
climatic environmental conditions 3K3 condensation excluded
chemical active environmental conditions 3C3 salt fog excluded
mechanical environmental conditions 3M4
mechanical active environm. conditions 3S2 sand appearing excluded
usage at altitude ≤2000 m
2Important to a safe electrical connection to the cabinet earth. The minimum tightening torque depends on the
material in which the fixing screws are screwed.
3When using cabinets it is recommended to install the SIPLUS PSU in the lowermost tier. The maximum ambi-
ent temperature in dependency of the consant current through the feeder diodes is to be considered according
to derating in chapter 6.1.

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5.3 Feeding
Nominal voltage L1, L2
Permitted ripple
DC 24 V according to DIN IEC 60038 4
±3.6 V (corresponds ±15 % of the nom. voltage)
Static limits (incl. ripple)
Lower limit
Upper limit
20 V
30 V
Dynamic limits (incl. ripple)
Upper limit 35 V, duration ≤500 ms, recovery time ≥50 s
Max. permitted constant current through the
feeder diodes 60 A, notice the derating in chapter 6.1
Power loss complete device
(at 30 A current consumption) 5typ. 26 W
Line terminal connection screw terminals
Feeder terminals L1, L2, 2 x M
X101, X102, X103, X104
min. wire cross-section 25 mm2or AWG 6
max. wire cross-section 50 mm2or AWG 0
dismantling length 24 mm
tightening torque 6 N m – 8 N m
Branch terminals 2 x M, L1, L2, L1/L2
X105, X106, X107, X108, X109
min. wire cross-section 4 mm2or AWG 12
max. wire cross-section 16 mm2or AWG 4
dismantling length 11 mm
tightening torque 1.5 N m -1.8 N m
Branch terminal L1/L2, X109
This terminal may be used exclusively for test
purposes according to chapter 8.3 “Checking of
the Feeder Diodes”
Figure 6: Feeding and branch terminals Figure 7: Feeding circuit
4External supply voltage is to be generated as potential free Protective Extra Low Voltage PELV (according to
EN 50178).
5Typical value for project planning when supplying four FUM sub racks with 7.5 A current consumption each

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5.4 Supply Outputs
Max. permitted constant current 6Imax = 15 A
Voltage drop from feeder terminal up to sup-
ply terminals X1-X20 typ. 1.00 V, max. 1.30 V
fuse link
type
Tripping characteristic 7
Rated voltage
blade fuse according to DIN 72581-3
(withdrawn standard) style C
15 A slow acting (5-fold rated current 200 ms min.)
≥45 V
Line terminal connection plug connectors, 2-pole
COMBICON MSTB 2,5 HC/ 2-ST-5.08 RDB
min. wire cross-section 0.25 mm2or AWG 24
max. wire cross-section 2.5 mm2or AWG 12
(see chapter 9 “Order Designations”)
NOTICE
Possible damages of the facility!
At insufficient dimensioning of the wire cross-section the respective line may
be excessive charged. This leads to strong heating of the conductor up to
damage.
The wire cross-section has to be dimensioned according to the nominal current
of the selected fuse and the expected load current.
Figure 8: Supply outputs
6When using fuse-links of the type Little fuse TF90 – 15 A (delivery condition) and considering the maximum
permitted continuous current at the input terminals, see chapter 5.3. For selection of the correct fuses see chap-
ter 9 “Order Designations”.
7For selectivity when connecting a FUM-Sub rack EU 902 / EU903 / EU905 or a S7-400H Sub rack

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5.5 Signaling Outputs
MELD (X21, Pin right)
HIGH-level
LOW-level
Load current (HIGH level)
Short circuit current
Digital output DC 24 V, active HIGH (at fault)
min. L1 – 3.0 V resp. L2 – 3.0 V
max. 3.0 V
max. 0.5 A (current sourcing, short circuit proof
towards M)
max. 2.1 A
MELD_N (X21, Pin left)
LOW-level
HIGH-level
Load current (LOW level)
Short circuit current
leakage current
Digital output DC 24 V, active LOW (at fault)
max. 3.0 V
min. L1 – 3.0 V resp. L2 – 3.0 V
max. 0.5 A (current drawing, short circuit proof
towards L)
max. 15 µA (high impedant state)
Line terminal connection plug connectors, 2-pole
COMBICON MSTB 2,5 HC/ 2-ST-5.08 RDB
min. wire cross-section 0.25 mm2or AWG 24
max. wire cross-section 2.5 mm2or AWG 12
(see chapter 9 “Order Designations”)
NOTICE
Possible damages of the facility!
At insufficient dimensioning of the wire cross-section the respective line may
be excessive charged. This leads to strong heating of the conductor up to
damage.
The wire cross-section has to be dimensioned according to the short circuit
current of the respective signaling output.
Figure 9: Pin assignment signaling outputs
X21
MELD_N
MELD
L1/L2
M
LPullup
SIPLUS PSU
(optional)
Figure 10: Schematic diagram signaling outputs
As an option an external pullup can be connected to the MELD_N output in order to generate H-
levels when feeding voltage driven inputs (see fig. 10). The application impedance and the MELD_N
leakage current have to be considered here among other constraints.

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6 Installation instruction
6.1 Mounting position, heat dissipation and derating
According to figure 11 the SIPLUS PSU has to be installed so that a vertical unimpeded flow of the
cooling air at the heat sink on the back side of the equipment is ensured.
Figure 11: Airflow Figure 12: Derating of ambient temperature
For thermal optimizing of the incoming air the installation in the lower part of the cabinet is recom-
mended. In this case the equipment is placed close at the air inlet.
The Device is designed to handle a rated current of I = 60 A at ambient temperatures of Ta ≤60°C
without getting damaged.
However the ambient temperature is limited depending on the operating current through the feeder
diodes according to Figure 12 to ensure a save operation with a maximum allowed housing surface
temperature as required in the product safety standard EN 60950-1.
CAUTION
Risk to be burnt!
The heat sink and housing parts may be highly heated causing risk of injury in
case of touch.
Before touching the metal parts these have to cool down sufficiently.

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6.2 Installation into the cabinet
When operating the SIPLUS PSU in I & C cabinets the installation in the lowermost tier is recom-
mended. The supply cables and transfer cables to the neighboring cabinet are connected vertically
from below.
The SIPLUS PSU is designed for wall mounting, holm mounting and for installation in racks and cab-
inets. The fixing dimensions are designed according to chapter 5.1 “Mechanics”.
The SIPLUS PSU has to be installed exclusively in plants with limited admission (according to
EN 60950-1). This ensures that exclusively repairer (according to EN 60950-1) with sufficient tech-
nical instruction and experience have access to this installation.
For further instructions to installation and commissioning see chapter 7 “Commissioning”
6.3 Back-up fuse
The SIPLUS PSU has to be operated only with sufficient back-up fuse.
Figure 13: Operation with back-up fuse
In this case the potentials L1 and L2 have to be provided with external fuses (F1ext and F2ext) like
shown in the figure 13.
Dimensioning of the back-up fuse:
Recommended back-up fuse NEOZED 5SE2 63 A
Rated current max. 63 A
Rated voltage min. 60 V DC
Rated cut-off capability min. 2000 A
Cut-off I²t value I²tAmax. 16000 A² s (tA= 4 ms)
Pre-arcing I²t value I²tS
for reasons of the selectivity
min. 3000 A² s (tS= 4 ms)
If necessary the nominal current and the cut-off integral of the back-up fuse for the line protection of
the conductor to the supply terminals (X101 – X104) as well as for the line protection of the conduc-
tors to the branch terminals (X105 – X108) has to be dimensioned less.