Applications
9.3 Series connection for increased voltage
LOGO!Power
50 Operating Instructions, 06.2014, C98130-A7560-A999-3-7629
Series connection for increased voltage
To achieve a higher output voltage, two LOGO!Power 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 grounding point of the secondary output voltage, voltages of +2×U
A
, ±U
A
or -
2×U
A
can be implemented.
In the case of asymmetric load distribution, it is not possible to ensure correct functionality.
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 cannot be guaranteed in the case of a
fault.
Figure 9-3 Series connection
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