Siemens 6SN1123-1AA00-0DA2 Configuration Manual page 229

7 Line Supply Connection
7.3 Overcurrent protective devices, transformers and main switch
Leading contact is
not absolutely
required
Switching element
without
leading contact
I/RF module
Fig. 7-11 Examples of three configurations that do not require a leading contact
7-228
Caution
If switching elements are used without leading contact, then it must be
absolutely ensured that after powering–down and –up the NE module again,
terminal 48 (start/contactor control) is deenergized in order to activate the
precharging circuit. If this is not the case, then high re–charging currents
(similar to short–circuit currents) can occur when powering–up again. These
re–charging currents are not limited by the pre–charging circuit. This can trip
the fuse or damage/destroy the NE module.
For the subsequently described configurations, it is not absolutely necessary
that a leading contact is used for the switching element:
S
Only one NE module is connected to the switching element.
Caution
When using I/R modules, no additional loads may be connected to the
switching element.
S
Connection of NE modules with the same power class to one switching ele-
ment. In this case, the restrictions for connecting several
NE modules to a switching element must be carefully observed (refer to the
following page).
Caution
If I/R modules are connected together with UI modules to one switching
element, overvoltage limiter modules must be used.
Switching element
without
leading contact
Further
UI module
consumers
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Switching element
without
leading contact
I/RF module I/RF module
16 kW 16 kW
Overvoltage limiter modules must be used
No additional loads may be connected
Carefully observe the following restrictions
and limitations!
© Siemens AG 2012 All Rights Reserved
05.08
05.01
UI module
28 kW