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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 mm
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 mm
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").
SIPLUS PSU Power Supply Unit
Copyright (C) Siemens AG 2018
2
2
up to 50 mm
resp. AWG 6 up to AWG 0 can be attached to the feeder
A5E00854207E
V 8.00 released
SIPLUS PSU (6DL3500-8BA)
2
resp. AWG 12 - 4 are
10 of 30
2018-05-03
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