LOGO!Power
Operating Instructions, 06.2014, C98130-A7560-A999-3-7629
47
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
lengths and the same cable cross-sections (or the same impedance) up to a common
external network junction (terminal strip) if possible.
● The parallel-switched power supplies must be switched on simultaneously with a common
switch in the mains supply line (e.g. with the main switch available in control cabinets).
● The output voltages measured in no-load operation for the power supplies that are not yet
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%.
Figure 9-1 Parallel connection, correct and incorrect
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