General System Design Items; Fuse Protection; Selection Of Ac Supply Fuses - ABB ACSM1 System Manual

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General system design items

Fuse protection

Fuses are needed on the AC supply side and in the DC connections. These
will provide protection for the cabling and also limit the damage in case of
short circuit in the system. Following items should be checked for fuse
selection.
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Selection of AC supply fuses

The standard selection table for the AC supply fuses in the single drive
configuration can be found in the ACSM1 hardware manual. That selection
guideline can be used, when the AC supply line current of the drive
module(s) connected to AC supply is according to that table.
Here are the general guidelines for the selection of AC supply fuses.
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Fuse class depending on fault current type and protected items
Fuse voltage rating
Fuse current rating
Standards and regulations. Here are given the general guidelines for
the fuse selection, please observe always also the local and application
specific regulations.
IEC fuse class gG or UL class T are suitable for AC supply side
Fuse voltage rating of 500 V should be selected for 380...480 V AC
supply.
Fuse nominal current
where factor 1.6 covers the influence of cyclic load and ambient
conditions. If the average motoring line current I
known the nominal power ratings of the drive module can be used.
However the selected fuse current rating and operation curve should
be in line with the supply cable cross section to meet the regulations
for the cable protection.
≈ 6 ×
I 1 . I
F N , mot , ave ( ) i
is not exactly
mot,ave