ADCP-80-575 • Issue 2 • December 2006

alarm indicator is off when all fuses in the fuse holder module are operational. Loss of power to a bus will not cause the fuse alarm indicators corresponding to that bus to be lighted. For GMT fuses, there are four or ten fuses per fuse holder with a single fuse alarm indicator for the entire set of fuses. For TPA fuses, there is one fuse holder per fuse and, therefore, a fuse alarm indicator for each fuse.

KLM fuse holders have a two-color alarm indicator (green/red LED). The LED is green when a good fuse is present and receiving power. The LED is red when a fuse is blown or removed. If a fuse holder is present but no fuse, the LED may be either red or unlit depending on operator intervention (see Section 1.7 on Page 6).

1.16 Power-On Indicator

An optional visual power-on indicator (green LED) for each power bus is mounted near the center of fuse platform front panel. If present, the LED, when lighted, indicates that power is being applied to the bus input connectors. An unlighted LED indicates that power is not being applied. The power-on indicator LED can be replaced in the field.

1.17 Fused Equipment Designation Card and Holder

Two fuse designation cards, shown in Figure 4, and a card holder with a clear plastic cover are provided with the fuse platform. The card holder may be attached to either the fuse platform, the fuse platform mounting brackets, the rack, or a suitable surface close to the fuse platform. One of the cards may be filled out with circuit information for each of the circuits and inserted in the card holder. The card holder has a pressure-sensitive adhesive backing for attachment. Additional fused equipment designation cards, card holders, and plastic covers can be ordered separately if required.

1.60 IN.

(4.06 CM)

2.36 IN. 18866-A

(5.99 CM)

Figure 4. Fuse Designation Cards

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© 2006, ADC Telecommunications, Inc.