Overload Capability - Siemens SINAMICS S120 Equipment Manual

3.7.1

Overload capability

The Power Modules are equipped with an overload reserve e.g. to handle breakaway
torques.
In drives with overload requirements, the appropriate base load current must, therefore, be
used as a basis for the required load.
The criterion for overload is that the drive is operated with its base load current before and
after the overload occurs (a load duration of 300 s is used as a basis here).
Low overload
The base load current for low overload (I
150% for 10 s.
Fig. 3-9
High overload
The base load current for a high overload (IH) is based on a duty cycle of 150% for 60 s or
160% for 10 s.
Fig. 3-10
Chassis Power Units Liquid Cooled
SINAMICS S120 Equipment Manual, Edition 12/2007, 6SL3097-2AM00-0BP4
10 s
1.5 * I
L
1.1 * I
L
I
L
60 s
300 s
Low overload
10 s
1.6 * I
H
1.5 * I
H
I
H
60 s
300 s
High overload
) is based on a load duty cycle of 110% for 60 s or
L
Power Modules
3.7 Technical specifications
3-15