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


Flywheel Transformer

Usage:

UPS 250 APZ


Description



Illustration 1g01277831
(1) Transformer "T2"
(1) Transformer "T1"

Transformer "T1" (2) and Transformer "T2" (1) are multitap transformers that provide AC power to the Power Distribution PWA. Transformer "T1" (2) is supplied from the input of the UPS. Transformer "T2" (1) is supplied from the protected output of the UPS. The transformers are installed on the left panel of the cabinet. Refer to Illustration 1 for the locations of the transformer.

Removal Procedure

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

  1. Remove the two screws that attach the thermistor to the terminal block.

  2. Remove each thermistor from the terminal block.

    Note: One screw is attached to the "H1" terminal connector and one screw is attached to the "COM" or "H2" terminal connector.

Installation Procedure



    Illustration 2g01277850
    Wiring for the Transformer

  1. Place one lead of the thermistor into the "H1" connector. Place one lead into the "COM" or "H2" connector. Refer to Illustration 2.

  2. Tighten the two screws in order to firmly attach the thermistor.

Table 1
Specifications for the Transformer 
  Input (V)  Output (V)  Wire Gauge (AWG) 
T1  380, 400, 415, 480  190, 230  10-22 
T2  380, 400, 415, 480  190, 230  10-22 

Table 2
Specifications for the Thermistor 
  Size  Ohm 
T1  32 mm  20 
T2  32 mm  20 

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