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


Transformer (T1 to T3)

Usage:

UPS 250 APZ


Description



Illustration 1g01273590
(1) Transformer "T1"
(2) Transformer "T2"
(3) Transformer "T3"

The left panel of the MMS cabinet consists of the following transformers: T1, T2 and T3.

The transformers are 480 V or 230 V transformers that feed the Power Distribution PWA (PWD). The transformers convert the utility input voltage to the following DC voltage:

  • 190 VDC

  • 230 VDC

  • 190 VDC and 230 VDC

Transformer "T1" (1) is supplied from the Bypass voltage. Also, the T1 supplies 190 VDC and the T1 supplies 230 VDC to the PWD.

Transformer "T2" (2) is supplied from the Output voltage. Also, the T2 supplies 190 VDC and the T2 supplies 230 VDC to the PWD.

Transformer "T3" (3) is supplied from the Input voltage and the T3 supplies 190 VDC to the PWD.

A thermistor is attached to each transformer on the lower side of the transformer. The thermistor is connected to the "H1" connector of the transformer.

The thermistor limits the inrush of current on the powerup of the system.

Removal Procedure

Refer to Systems Operation, Testing and Adjusting, RENR9988, "Internal Component Preremoval Steps (MMS System 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 2g01273627
    Wire Connections 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 attach the thermistor.

Table 1
Specifications for the Thermistor  
  Size  Ohm 
T1  32 mm  20 
T2  32 mm  20 
T3  32 mm  20 

Table 2
Specifications for the Transformer 
  Input (V)  Output (V)  Wire Gauge (AWG) 
T1  380, 400, 415, 480  190, 230  10 
T2  380, 400, 415, 480  190, 230  10 
T3  380, 400, 415, 480  190  10 

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