Applications; Parallel Connection To Increase Power Rating - Siemens LOGO!Power Series Operating Instructions Manual

Applications

9.1

Parallel connection to increase power rating

To enhance performance, two LOGO!Power power supplies of the same type can be
galvanically connected in parallel.
The following must be observed:
● The cables connected to each power supply at terminals "+" and "-" must have identical
● The parallel-switched power supplies must be switched on simultaneously with a common
● The output voltages measured in no-load operation for the power supplies that are not yet
Figure 9-1
LOGO!Power
Operating Instructions, 06.2014, C98130-A7560-A999-3-7629
lengths and the same cable cross-sections (or the same impedance) up to a common
external network junction (terminal strip) if possible.
switch in the mains supply line (e.g. with the main switch available in control cabinets).
connected in parallel should not deviate more than a maximum of 0.2%. This usually
corresponds to the factory setting. If the output voltage is changed, you should connect
the "-" terminals and then, in no-load operation, measure the voltage difference between
the "+" terminals that have not yet been connected. The voltage difference should not
exceed 0.2%.
Parallel connection, correct and incorrect
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