7
05.01
7.3 Line supply fuses, transformers and main switch
7-221
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) -- 05/2008 Edition
Table 7-11 Using a leading contact for SIMODRIVE units
Unit connected to
the switching ele-
ment
Leading con-
tact
required
No leading
contact
Remarks Risks
Only UI modules -- n -- --
Only UI modules with
additional loads
-- n -- --
Only I/R modules
(without additional
loads)
-- n
The appropriate
restrictions must
be carefully ob-
served.
If these restrictions are not carefully ob-
served, then smaller rating modules can
be destroyed by the modules that are
presently regenerating when the switching
element is opened.
Only modules that
can regenerate into
the line supply with
additional loads
n -- --
If a leading contact is not used, then the
additional connected loads could be de-
stroyed by overvoltages
I/R modules together
with UI modules
It is necessary to
use overvoltage
limiter modules.
If an overvoltage limiter module is not
used, when the switching element is
opened the module could be destroyed by
other modules that are regenerating at that
time.
-- n
The appropriate
restrictions must
be carefully ob-
served.
If these restrictions are not carefully ob-
served, then smaller rating modules can
be destroyed by the modules that are
presently regenerating when the switching
element is opened.
I/R modules together
with UI modules and
additional loads
n -- --
If a leading contact is not used, then the
additional connected loads could be de-
stroyed by overvoltages.
Summary
7L
ne Su
l
Connec
on02.0305.08
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