Siemens 6SN1123-1AA00-0DA2 Configuration Manual page 212

02.12
05.01
Matching
A SIMODRIVE NE module and other loads/machines are connected at the
matching transformer (refer to Fig. 7-7).
transformer
configuration
Fig. 7-7
A matching transformer must be dimensioned for the total of all loads connected
to it. The apparent power required for the NE modules must be determined and
added as shown in Chapter C.1.3, Table 7-1. If the transformer S
small, this can lead to increased line voltage dips and faults in the system and
in other loads at this connecting point.
The short–circuit power must be adequately dimensioned so that the overcur-
rent protective device reliably trips.
Warning
!
A sufficiently high system fault level (short–circuit power) is required to ensure
that when a ground fault does occur, the fuses rupture in the specified time. An
insufficient system fault level (short–circuit power) increases the time to trip
beyond permissible levels (e.g. a fire is possible).
© Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Line supply
connection/
S plant
K
transformer for
the plant
For isolating
transformer:
Ground the star
1)
point!
S transformer
K
Matching trans-
former for the
machine
S line
K
Line fuses
Z
Line filter
Commutating
reactor
U1 V1 W1
PE
NE module
1) Loadability, note dependent of the vector group!
Connection schematic, matching transformer for additional loads
7 Line Supply Connection
7.2 Voltage matching
Line fuses
Additional loads/
machines
or S is too
n K
7
7-211