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


Modem (SMS Bypass Cabinet)

Usage:

UPS 250 APZ


Description

The optional modem and power supply for the modem are located on the floor panel of the SMS Bypass cabinet. The Modem Transformer (T4) is located on a panel at the bottom of the right side of the Bypass cabinet. The transformer takes voltage from the UPS. Then, the transformer converts the voltage to normal modem voltage.

There are two different configurations for the transformer that are dependent on the output power. Refer to the following configurations:

  • 115 VAC

  • 230 VAC

Removal Procedure

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

  1. Disconnect the wires that lead to the transformer and from the transformer. The wires contain a labeling with the location of the wire. Verify the labeling of the wires for subsequent installation.

  2. Remove the four hex bolts (1) on the front of the transformer that secure the transformer to the bottom right panel of the cabinet.

Installation Procedure

  1. Position the transformer in the cabinet on the lower right panel. Secure the transformer with four hex head bolts (1).


    Illustration 1g01270618
    Wire Connections for the Transformer T4 with 115 VAC
    (1) Hex Bolt


    Illustration 2g01270619
    Wire Connections for the Transformer T4 with 230 VAC

  2. Connect the wires that lead to the transformer. Verify the labeling of the wires with the location of the wire. Refer to Illustration 1 and Illustration 2 for wire connections.

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