Baumuller b maXX 5500 - Page 267

Accessories and Spare Parts
Instruction handbook b maXX BM5500, BM5600, BM5700
Document No.: 5.13008.10
267
of 314
11
Device protection Use semiconductor fuses with the tripping characteristic aR (DVDE 0636-201 / DIN EN
60269-2-1 / HD 630.2.1 54). Connect these in series with the cable protection fuses. In
the event of a short-circuit, these protect the line-side rectifier unit circuit on the input side
against complete destruction, in order that it is possible to repair the device.
Dimension suitable device protection fuses depending on peak current and the maximum
load integral i
2
t
off
.
1)
Use fuses that fall below the specified cutoff integral (i
2
t
aus
) in the operating point.
Cable protection +
device protection
There are two alternatives for protecting cable and devices:
m Connecting cable protection fuses and semiconductor fuses in series
m Using full-range fuses with the tripping characteristic gR and gS (DVDE 0636-201 / DIN
EN 60269-2-1 / HD 630.2.1 54).
Dimension the suitable cable and devices protection fuses based on the cross-section of
the power supply cable used, the peak current and the maximum load integral i
2
t
off
.
In contrast to safety fuses, the device and cables may also be fused with the listed circuit
breakers according to UL (DIVQ).
Only circuit breakers without trip delay are approved. Circuit breakers with only a thermal
tripping characteristic are not tested and thus not approved. A particular point to consider
is that, in case of an error, the device is not protected against destruction; instead, only
the system is protected against the risk of fire.
The suitability of circuit breakers depends on the cross-section of the power supply cable
used and the dimensioning of the rated and peak current of the devices.
Device Maximum load integral
1)
BM551X 310 A
2
s
BM5522 400 A
2
s
BM5523 450 A
2
s
BM5524
BM5525
BM5526
BM5527
800 A
2
s
BM553X
BM563X
9 500 A
2
s
BM554X
BM564X
b 15.000 A
2
s
BM555X
BM565X
BM575X
97.000 A
2
s
BM556X
BM566X
BM576X
245.000 A
2
s
BM557X
BM577X
1.125.000 A
2
s