CRANKSHAFT GP 3590716 - Caterpillar

Transformers in the Cabinet of the Multiple Module Unit T1 and T2
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(1) Input/Output Cabinet (2) System Cabinet (3) MMU Cabinet (4) T1 Transformer in the Input/Output Cabinet (5) T1 Transformer in the System Cabinet (6) T3 Transformer in the System Cabinet (7) T2 Transformer in the System Cabinet (8) System Input/Output Board (9) T2 Transformer in the MMU Cabinet (10) T1 Transformer in the MMU Cabinet (11) Dual 24 VDC Power Supplies
Remove the rear access panel from the MMU cabinet.Transformer T1 and T2 will be located on the left component panel in the top left corner of the MMU cabinet. If rear access is not available, the transformers can be accessed through the access plate that is located on the top of the MMU, prior to installation of the wireway. Refer to the Operation and Maintenance Manual, "Electrical Connections". If the rear or the top access is not available, the transformer taps can be changed from the front of the unit, but the difficulty of the process is greatly increased.
Illustration 2 g00928094
Schematic Diagram of the Transformer
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Positions of the Transformer TapsTransformers T1, T2, and T3Located in the System Cabinet
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Positions of the Transformer TapsTransformer T2Located in the MMU Cabinet
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Positions of the Transformer TapsTransformers T1, T2, and T3Located in all Cabinets
Determine the voltage setting that is required by your system. Refer to illustration 2.The following list is the default voltage tap settings for the transformer from the factory:
400 VAC at 50 Hz
480 VAC at 60 HzNote: Different transformers are used interchangeably in the UPS. Refer to Illustrations 3 through 5