Overload capability

SINAMICS S120 Liquid Cooled units have an overload reserve, e.g. to handle breakaway torques. If larger surge loads occur, this must be taken into account when configuring. In drives with overload 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 short, repeating load cycles with significant load fluctuations within the load cycle, the appropriate sections in the SINAMICS Low Voltage Engineering Manual must be observed (as PDF file on the CD-ROM provided with the catalog).

Power Modules and Motor Modules

The base load current for a low overload I_L is the basis for 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 the basis for 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

Pressure drop

Pressure drop for frame size FL

Pressure drop for frame size GL

Current derating as a function of the temperature of the cooling liquid

Current derating as a function of ambient temperature

Permissible ambient temperature as a function of installation altitude

Voltage derating as a function of installation altitude