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 (SMS Bypass Cabinet)

Usage:

UPS 250 APZ


Description



Illustration 1g01269271
View of 4-Wire Zig Zag Transformer
(1) Zig Zag Transformer

The "T5" Zig Zag Transformer is located on the floor of the SMS Cabinet in a 4-wire installation. The "T5" Zig Zag Transformer 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


Illustration 2g01269273
View of the 3-Wire Zig Zag Transformer Rear Panel
(2) Zig Zag Transformer

Removal Procedure and Installation Procedure for the Zig Zag Transformer


NOTICE

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


Temperature Switch (4-Wire)

There is a 150 °C (302 °F) "TS1" Temperature Switch attached to the 4-wire "T5" Transformer. The "TS1" is connected to the Circuit Breaker (CB2) on the left panel. If the temperature of the "T5" Transformer reaches 150 °C (302 °F), the following actions will occur:

  • The switch will close.

  • The circuit breaker will trip.

  • The circuit breaker will shut down power to the transformer.

Current Transformers (4-Wire)

There are three circular 5000:1 Current Transformers (CTs) surrounding each of the Zig Zag Transformer Phase cables located at the bottom of the cabinet in a 4-wire installation. These current transformers relay a telemetry signal to the Zig Zag Controller board (ZZC).



Illustration 3g01269315
View of the 3-Wire Zig Zag Wire Connections

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