Line Supply Fuses, Transformers And Main Switch - Siemens SIMODRIVE 611 digital Configuration Manual

7 Line Supply Connection

7.3 Line supply fuses, transformers and main switch

7.3 Line supply fuses, transformers and main switch
7.3.1 Assignment of the line fuses to the NE modules
Table 7-3 Selection aid for line supply protection measures
X X X
X – X
X – –
– X X
– – –
7-208
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Fuses are necessary for line protection, to limit damage to the converter, to pro-
tect against electrical shocks, and to avoid fire in case of a fault.
Fuses and plant conditions, such as loop resistance and short–circuit power,
must be harmonized with each other so that the limit curve shown in Fig. 7-7 is
not exceeded.
Fusible links (Table 7-4) or, as alternative, circuit–breakers (Table 7-5) must be
used.
Table 7-3 should be used to choose the protection measure appropriate for the
local conditions.
Fusible links that can be used: LV HRC, D, DO size with gL characteristics. We
recommend the SIEMENS fuse types, listed below, that do not restrict/limit the
main power data of the NE modules.
Fusible links in accordance with the
documentation when tripped in less
than 10 ms (
or , , , )
Circuit–breaker with parameterized
magnetic short–circuit deactivation
adapted to the loop resistance (,
, , )
RCD switch (AC/DC–sensitive
type B) and isolating transformer or
circuit–breaker with residual current
monitor (RCM) (, )
Fusible links in accordance with the
documentation that can be tripped in
less than 10 ms
(
in accordance with test, , ,
, )
RCD switch (AC/DC–sensitive
type B) and isolating transformer or
circuit–breaker with residual current
monitor (RCM) (, )
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
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Minimum accept- Excessively large fusible
able links increase the device
damage in case of fault or
can cause fire
Minimum accept- Fusible links rather than
able circuit–breakers can cause
increased device damage or
fire
Spurious tripping Device damage or fire
for large configu-
rations
Excessive line Excessively large fusible
supply dips for links increase the device
other loads damage in case of fault or
can cause fire
Excessive line Device damage or fire
supply dips for
other loads
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