Rev D

PSAYC SERIES

2 Watt

AC/DC Switching Power Supplies

08/25/2015

Wall Industries, Inc. • 37 Industrial Dr., Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797

website: www.wallindustries.com • e-mail: sales@wallindustries.com

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APPLICATION NOTES

AC Input Line Connection:

The pin of AC line (L), AC Neutral (N), and the third wire safety ground (FG) should be retained from the AC power

outlet to the power supply input terminals without accidental interchange. (Figure 1.1)

The FG pin should be connected to the equipment where power supply is placed as thicker and shorter to protect

electric shock or noise interference. (Figure 1.2)

Series and Parallel Operation

I.

Series operation: Most power converters can be operated in series if they have overload limitation by either

constant current or constant power circuits. To protect each output from the reverse voltage applied by the

other unit in the event of load short circuits, reverse biased diodes are used as shown in Figure 2.1.

II. Parallel operation: This is only recommended with power converters specifically designed for parallel

connection. In the parallel redundant scheme illustrated in Figure 2.2, one of the power converters could be

replaced by a battery followed by a DC-DC converter to provide a no-break power sustem in the event of

main supply failure.