Differential-Pressure Switch; Door Limit Switches; Power Supply Unit - Siemens SINAMICS SL150 Operating Instructions Manual

Description
3.3 Power unit
3.3.2.7

Differential-pressure switch

The differential-pressure switch monitors the independent air cooling and the associated fans.
The operating range lies between 100 and 1000 Pa. The differential-pressure switch measures
the pressure drop across the heat sink elements. The pressure drop is then compared with the
set response threshold. When the fans are in operation and draw the required volumetric flow
through the heat sink elements, the response threshold must have been exceeded.
See also
Replacing the differential pressure monitor (Page 90)
3.3.2.8

Door limit switches

Door limit switches monitor the doors. The circuit breaker opens when a door is opened.
The electromechanical door interlocking system prevents access to the power unit while
operational. The following conditions must be fulfilled in order to open the doors: For additional
information, see Chapter "Opening the device (Page 78)".
3.3.2.9

Power supply unit

Two power supply units are installed in the power unit of the cycloconverter These power
supply units supply power to the current converters.
Figure 3-5
32
Power supply units
SINAMICS SL150 6SL38600UL432AA0Z
Operating Instructions Rev.201910281433 EXAMPLE