6EP1352-1SH03 データシートの表示（PDF） - Siemens AG

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6EP1352-1SH03

Power supply LOGO!Power

Siemens AG 

Applications

5

5.1

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

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 5-1 Parallel connection to increase power rating

CAUTION

For connection of more than two power supplies in parallel, additional measures must be

taken to prevent high backward feeding currents in the event of a secondary device fault.

For this purpose, a suitable protective circuit (e.g. decoupling diode) must be installed

between each "+" terminal of the power supply and the common connection point.

LOGO!Power

Operating Instructions, 02.2011, C98130-A7560-A999-1-7619

19

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