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Siemens D 21.4 · 2017
SINAMICS S120 drive system
Chassis format
Air-cooled units in chassis format
7
■
Characteristic curves
(continued)
Overload capability
SINAMICS S120 chassis units have an overload reserve, e.g. to
handle breakaway torques. If larger surge loads occur, this must
be taken into account in the configuration. For drives with over-
load requirements, the appropriate base load current must,
therefore, be used as a basis for the required load.
The permissible overload levels are valid under the prerequisite
that the drive units are operated with their base-load current
before and after the overload condition based on a duty cycle
duration of 300 s.
For temporary, periodic duty cycles with high variations of load
within the duty cycle, the relevant sections of the SINAMICS Low
Voltage Engineering Manual must be observed.
Power Modules and Motor Modules
The base load current for a low overload
I
L
is based on a duty
cycle of 110 % for 60 s or 150 % for 10 s.
Low overload
The base load current for a high overload
I
H
is based on a duty
cycle of 150 % for 60 s or 160 % for 10 s.
High overload
Line Modules
The base-load current for a high overload
I
H DC
is the basis for a
duty cycle of 150 % for 60 s or
I
max DC
for 5 s.
High overload
60 s
10 s
300 s
t
1.1 x
I
L
1.5 x
I
L
Short-time current 110 %
Short-time current 150 %
Rated current (continuous)
Converter current
G_D213_EN_00035
Base-load current
I
L
for low overload
I
L
I
rated
60 s
10 s
t
1.5 x
I
H
1.6 x
I
H
Short-time current 160 %
Short-time current 150 %
Rated current (continuous)
Converter current
G_D213_EN_00036
Base-load current
I
H
for high overload
I
H
I
rated
300 s
60 s
5 s
t
300 s
I
rated DC
I
H DC
Base-load current
I
H DC
for high overload
G_D213_EN_00079
Converter current
Rated current (continuous)
Short-time current 150 %
Short-time current
I
max
I
max DC
1.5 x
I
H DC
© Siemens AG 2017