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


Zig Zag Transformer (MMS System Cabinet)

Usage:

UPS 250 APZ


Description



Illustration 1g01275261
View of the 4-Wire Zig Zag Transformer
(1) Zig Zag Transformer


Illustration 2g01275262
View of the 3-Wire Zig Zag Transformer Rear Panel
(2) Zig Zag Transformer

The Zig Zag Transformer (T5) is located on the floor of the MMS System Cabinet in a 4-wire installation. The Zig Zag Transformer (T5) is located on the rear panel in a 3-wire installation.

The transformer is required for establishing the neutral point of the UPS 3-phase output when the following conditions occur:

  • discharge mode of the system

  • disconnection of the utility input

Removal Procedure and Installation Procedure for the Zig Zag Transformer (T5)


NOTICE

Removal of the Zig Zag Transformer (T5) and installation of the Zig Zag Transformer (T5) are not field service procedures. Contact your Caterpillar technical support.


Current Transformers (4-Wire)

Each of the three Zig Zag transformer cables has a 1500:5 current transformer (CT) installed on each of the cables. The CTs are located at the bottom of the cabinet in a 4-wire installation. The current transformers relay the flywheel telemetry to the board for the Zig Zag Controller.

Caterpillar Information System:

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