7
05.01
7.2 Voltage matching
7-200
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) -- 05/2008 Edition
Symmetrical 3--conductor or 4--conductor three--phase line supply with no di-
rectly grounded point. The loads are c onnected, e.g. with grounds.
Commutating
reactor
U1 V1 W1
IT line supply and isolating transformer
connection schematic
Line supply/transformer for the factory
Isolating
transformer
PE
N
L3
L2
L1
NE module
Commutating
reactor
U1 V1 W1
IT line supply and isolating transformer
connection schematic
Line supply/transformer for the factory
Isolating
transformer
PE
N
L3
L2
L1
NE module
PE
PE
≁ ≁
Line filter Line filter
Fig. 7-3 IT line supplies connection schematic
Thus, within the pulsed transistor converter, the voltage stressing on the insulat-
ing clearances between the power circuits at the line supply potential and the
open and closed --loop control circuits referred to the protective conductor poten-
tial, according to a rated voltage of 300 V complies with IEC/DIN EN 50178.
Due to the 6 --pulse 3 --phase bridge circuit in the line supply infeed module, any
fault currents will contain DC components. This must be taken into consider-
ation when selecting/dimensioning a fault current protective device, e.g. an
RCCB.
IT line supply
7L
ne Su
l
Connec
on 11.05
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