DC−bus operation
Basic dimensioning
Cable protection
7
355
EDS94SPP101 EN 10.2
7.5.7 Cable protection
In case of interferences, the cables have to be adequately protected (7.4.4).
Please consider the following when dimensioning the DC bus for a plant or machine:
ƒ Mains fuses can be used to protect the DC cables if the wiring is designed for 122 %
of the rated fuse current. Otherwise, the cable protection for the DC cables must be
specially determined.
ƒ Select the fuses for the currents resulting from power P
DC100%
. Please observe the
standards and regulations applicable for the particular location and application.
ƒ Fuse the DC−supply modules according to the Technical data on the AC mains side.
ƒ The DC outputs of the supply modules need not be fused if all connected controllers
are fused in accordance with the specifications.
ƒ "Multi Drive" controllers are default equipped with a fuse in the installation
backplane. The fuse is only effective if the DC busbar is used. In this case, a single
pole fusing against short−circuit is sufficient.
ƒ "Single Drive" controllers can be retrofit with a fuse in the mounting backplane. The
fuse will only be effective if the DC busbar is used. In this case, a single−pole fusing
against short−circuit is sufficient.
For retrofitting, use the E94AZJA0xx busbar mounting set.
ƒ If the DC bus is wired via the terminals +UG/−UG, always select a 2−pole cable
protection.
7.5.8 Filters
The following filters can be used for the DC−supply modules.
Mains filter DC power supply module
Type Device size Type Device size
E94AZMP0084 2 E94APNE0104 1
E94AZMP0294 3 E94APNE0364 3
E94AZMP0824 4 E94APNE1004 4
E94AZMP2004 5 E94APNE2454 5
The mains filters are designed for the following conditions:
ƒ 10 interconnected devices,
ƒ each with a 50 m motor cable,
ƒ EMC category C2.
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