7
05.01
7.2 Voltage matching
7-211
©
Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
A SIMODRIVE NE module and other loads/machines are connected at the
matching transformer (refer to Fig. 7-7).
Line fuses
PE
NE module
Line supply
connection/
transformer for
the plant
S
K
plant
Additional loads/
machines
V1
U1
W1
S
K
line
Commutating
reactor
S
K
transformer
Matching trans-
former for the
machine
Line filter
For isolating
transformer:
Ground the star
point!
1)
Line fuses
1) Loadability, note dependent of the vector group!
Fig. 7-7
Connection schematic, matching transformer for additional loads
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
n
or S
K
is too
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).
Matching
transformer
configuration
7 Line Supply Connection
02.12
