When power supplies are connected in parallel, mostly, is intent to increase the output current. Due to the design of active current sharing, they are mostly without reverse current protection, therefore, they are not the best solution when talking about redundancy. For redundant purpose, please choose the PSU with redundant function or implement external redundant modules. Be sure that the difference in output voltage and wiring impedance, should be as small as possible.

1. Use PSP models as example, connect P(LP/CS) terminals together (Please refer to the parallel function of specification). Input and output should be connected in parallel before connecting to the AC source and loads.

2. Output voltage difference between S.P.S. units should be as small as possible, normally < 0.2V.

3. The power supplies should be paralleled with short and large diameter wiring together first, and then connected to the load.

4. After paralleling, the maximum usage of total power should be around 90% of the rated total power.

5. When power supplies are paralleled, if the load is lower than 10% of rated load of individual S.P.S. The LED indicator or signals (Power Good、Pok、Alarm Signal) may malfunction.

6. To ensure that the load current is effectively shared in parallel operation, in general, it is recommended not to use more than 4-6 power supplies at one time.

7. In some models, the +S, -S terminals should be used to reduce unstable pulsation of output voltage.