UPS 120, UPS 150, UPS 250, UPS 300, UPS 301, UPS 500, UPS 600, UPS 750 and UPS 900 Uninterruptible Power Supplies Caterpillar

System Fuse (SMS Bypass Cabinet)

Usage:

UPS 250 APZ

Description

The SMS Bypass cabinet contains fuses in two locations of the cabinet.

There is a set of fuses on the optional Static Bypass Panel that is located in the front of the cabinet. There is one fuse that is located on the left panel in 4-wire configurations.

Static Bypass Fuses

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Illustration 1	g01268059
(1) Left Panel (2) Static Bypass Panel

Refer to Illustration 1 for the location of the Static Bypass Panel (2) in 3-wire SMS cabinets. Refer to Illustration 1 for the location of the Static Bypass Panel (2) in 4-wire SMS cabinets.

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Illustration 2	g01268067
(3) Fuses "F22, F23, F24"

Refer to Illustration 2 for the locations of the fuses (3) on the Static Bypass Panel.

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Illustration 3	g01268074
Static Bypass Fuses

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Illustration 4	g01268323
View of the Switch Wiring for the Static Bypass Fuse

Refer to Illustration 3 and 4 for the specific locations of the fuses.

4-Wire Neutral Reference Fuse

Refer to Illustration 1 for the location of the left panel (1) in a 4-wire Bypass cabinet.

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Illustration 5	g01268083
(4) Fuse "F33"

Refer to Illustration 5 for the location of the fuse (4) on the left panel .

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Illustration 6	g01268109

Refer to Illustration 5 for the specific locations of the fuses.

Removal Procedure

Refer to Systems Operation, Testing and Adjusting, RENR9988, "Internal Component Preremoval Steps (SMS Bypass Cabinet)" in order to shut down the system and gain access to internal components.

Remove the wires to the fuse sensor. Verify the labeling of the wires.
Remove the upper nuts and the lower nuts that attach the fuse and cable to the standoff. Verify the labeling of the cable.

Installation Procedure

Position the fuse in the cabinet over the standoffs that are connected to the right panel.
Attach the fuse and the cable to the standoff with a nut and a washer.
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Illustration 7 g01268323
Attach the wires to the fuse sensor. Refer to Illustration 7.

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Table 1
Fuse	Component
F22	K4 Contactor Static Bypass Phase A
F23	K4 Contactor Static Bypass Phase B
F24	K4 Contactor Static Bypass Phase C
F33⁽¹⁾	Neutral of the Zig Zag Transformer⁽¹⁾

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⁽¹⁾	4-wire only

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