ADCP-80-575 • Issue 2 • December 2006

–An alarm can be cleared in any KLM fuse position by installing a new fuse and removing it when the green LED flashes. When the alarm is cleared, the LED changes from red to unlit (no red light or green light). The LED remains unlit until a good fuse in installed, whereupon it turns green. For the alarm clearing procedure, refer to Section 6.1 on Page 28.

The maximum current capacity of each power bus circuit is 100 Amps. The total output current capacity of the fuses on each bus must, therefore, not exceed 100 Amps. The maximum current rating is marked on the fuse platform rear side. The power dissipation of the panel is 80 watts maximum per fuse platform (40 watts per bus at 100 Amps).

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).

Note: The continuous output load of the equipment during normal operation should not exceed 80% of the rated value of the fuse. This allows some room for manufacturing tolerances and voltage fluctuations in the plant power mains.

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

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

•KLM type fuse (each fuse in two, four, or five 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 module): 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

1.10Input 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.

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© 2006, ADC Telecommunications, Inc.