AEW datasheet(39/46 Pages) ASTEC

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3. Input and Output

3.1 Input fuse

The AEW power module has no internal fuse. An external fuse must always

be employed! To meet international safety requirements, a 250 Volt rated fuse

should be used. If one of the input lines is connected to chassis ground, then

the fuse must be placed in the other input line.

Standard safety agency regulations require input fusing. Recommended fuse

ratings for the AEH Series are shown in the following table:

Input voltage

Dual output

Triple output

Rated 24V input

Rated 48Vinput

2.5A

3.2 Input filtering

Input filters are included in the converters to help achieve standard system

emissions certifications. Some users however, may find that additional input

filtering is necessary. The AEW series has an internal switching frequency of

280 kHz so a high frequency capacitor mounted close to the input terminals

produces the best results. To reduce reflected noise, a capacitor can be added

across the input as shown in following figure, forming a

π filter.

For conditions where EMI is a concern, a different input filter can be used.

Following figure shows an input filter designed to reduce EMI effects.

z Recommended L & C:

AEW bảng dữ liệu(PDF) 39 Page - Astec America, Inc