Siemens SITOP PSU400M, Manual

Page: 50 / 58

Applications
9.3 Series connection for increased voltage
SITOP PSU400M
50
Manual, 05.2018, C98130-A7601-A1-5-7629
9.3 Series connection for increased voltage
To achieve an output voltage of 48 V DC, two 24 V SITOP power supplies of the same type
can be connected in series.
Depending on the grounding point of the secondary output voltages, voltages of +48 V,
±24 V or -48 V can be realized.
Note
For additional details, see Catalog KT 10.1 Chapter 15 Technical information and configuring
(see
http://w3app.siemens.com/mcms/infocenter/content/en/Pages/order_form.aspx?nodeKey=ke
y_518431&infotype=catalogs )).
WARNING
SELV is not guaranteed in the case of a fault
When connecting two power supplies in series, the continuous, permissible SELV voltage
of a maximum of 60 VDC according to EN 60950-1 cannot be guaranteed in the case of a
fault.
Figure 9-3 Series connection