Applications
9.3 Series connection for increased voltage
SITOP PSU300M/300B
Manual, 11.2014, C98130-A7574-A2-2-7629
69
9.3
Series connection for increased voltage
To achieve an output voltage of 48 V DC, two 24 V SITOP PSU300M/300M power supplies
of the same type can be connected in series. In this case, connect the "-" terminal of the first
power supply to the "+" terminal of the second power supply. The "+" terminal of the first
power supply and the "-" terminal of the second power supply are routed to the load.
Depending on the grounding point of the secondary output voltages, voltages of +48 V,
±24 V or -48 V can be realized.
In the case of an asymmetric load distribution, it is not possible to guarantee correct
functionality.
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 V DC according to EN 60950 cannot be guaranteed in the case of a
fault.
Figure 9-4
Series connection for increased voltage
