Siemens SINAMICS S120 Equipment Manual page 165

Note
The fans are power-up and power-down as a function of the heatsink temperature.
The fans start up at the heat-sink temperature specified in the power stack data (normally
56°C) and are switched off with a slight hysteresis when the heat-sink temperature
decreases again. The length of time it takes for the fans to stop once they have been
switched off depends on a number of factors (ambient temperature, output current, duty
cycle, etc.) and, therefore, cannot be determined directly.
The fans are not equipped with temperature-dependent speed control; Only the states on or
off exist.
Remove the holder for securing the Control Unit
If an additional component is to be flush-mounted to the left of the component, the holders
for securing the Control Unit must be removed.
Use suitable tools to lift the latching device
and push up the holder
Booksize power units
Manual, (GH2), 06/2008, 6SL3097-2AC00-0BP6
Remove the holder
3.2 Active Line Modules with internal air cooling
The holder removed
Line Modules Booksize
165