ADCP-80-526 • Issue 6 • December 2006

1.8Bus Capacity

The current capacity of each power bus is 100 Amps maximum, which is marked above the input connectors on the rear of the fuse platform. The total current of a fuse platform with two buses is 200 Amps maximum. The power dissipation of the fuse platform is 80 watts maximum per fuse platform (40 watts per bus at 100 Amps)

The following lists the maximum current that each type of fuse can provide:

•TPA type fuse (each fuse in two, four, or six position module): 50 Amps max.

•KLM type fuse (each fuse in two or four position modules): 30 Amps max.

•GMT type fuse (each fuse in four position module): 15 Amps max.

•GMT type fuse (each fuse in 10 position modules): 10 Amps max.

1.9Input Voltage

The fuse platform can accommodate –24 Vdc input power on both busses or –48 Vdc input power on both busses. The voltage is sensed by the fuse platform circuitry.

The input voltage used with the fuse platform is required to have the following voltage characteristics:

•–24 Vdc nominal, within a range of –21 Vdc to –30 Vdc

•–48 Vdc nominal, within a range of –42 Vdc to –56 Vdc

Fuse panels for use with other input voltage values and polarity may be available by special order.

1.10 Input Power Connectors

Input power to the power bus is supplied through an input power terminal block located on the rear side of the fuse platform. Dual bus fuse platforms have a separate input terminal block for each bus. If two buses are present, the terminal blocks are designated A and B, corresponding to the two power buses.

Each input terminal block includes two pairs of 0.25-inch studs that are used for connecting the BATT (battery –) and RTN (return +) input power cables. Each pair of studs is mounted on 0.625 inch centers and accepts various size 2-hole compression lugs. The maximum lug width is 0.62 inches.

Compression lugs for various sizes AWG wire are available as accessory items. Nuts with captive washers are included to secure the compression lugs to the studs. The input terminal blocks are located on the rear side of the panel.

The minimum recommended wire size for the input power wiring is #2 AWG copper wire. In selecting wire size, follow local code referring to the ampacity guidelines provided in Appendix A of this manual.

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© 2006, ADC Telecommunications, Inc.