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


Bypass Static Switch (MMS System Cabinet)

Usage:

UPS 250 APZ


Description



Illustration 1g01275071
(1) Bypass Static Switch Assembly

The optional Bypass Static Switch Assembly (1) is located behind the door on the right panel of the MMS System cabinet. Refer to Illustration 1 for the location of the Bypass Static Switch Assembly (1).

The Bypass Static Switch Assembly (1) consists of the following components:

  • Fuses

  • Contactor for the Bypass Static Switch ("K4")

  • Static Switch Interface Board (SSI)

  • Static Switches

  • Snubber Assemblies


Illustration 2g01275073
Bypass Static Switch Assembly
(2) Fuses "F1-F3"
(3) Bypass Static Contactor "K4"
(4) Static Switch Interface Board (SSI)
(5) Snubber Assemblies
(6) Static Switches

Refer to Illustration 2 for an overview of the Bypass Static Switch Assembly (1).

Removal Procedure for the Assembly

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.

Note: All parts of the Bypass Static Switch Assembly (1) are removed as a unit and installed as a unit.

  1. Remove the shield that covers the static switch assembly (1).

  2. Cut the tie-wraps that hold the cables on the right side of the assembly (1).

  3. Remove the "J1" connector from the board (4). Remove the "J7" connector from the board (4).


    Illustration 3g01275115
    Wire Connections

  4. Disconnect the "F3 NC" wire that connects to the fuse sensors. Disconnect the "F1 COM" wire that connects to the fuse sensors. Refer to Illustration 3 for wire connections.

  5. Remove the "A1" contactor control and sense wire from the contactor "K4". Remove the "A2" contactor control and sense wire from the contactor "K4". Remove the "13" contactor control and sense wire from the contactor "K4". Remove the "14" contactor control and sense wire from the contactor "K4".

  6. Remove the "F1H" cable from the top of the fuses (2). Remove the "F2H" cable from the top of the fuses (2). Remove the "F3H" cable from the top of the fuses (2).


    NOTICE

    Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. When not in use, keep the module in its static-shield bag. Follow these guidelines when you handle any module:

    Touch a grounded object to discharge static potential.

    Wear an approved wrist-strap grounding device.

    Do not touch the bus connector or connector pins.

    Do not touch circuit components inside the module.

    If available, use a static-safe work station.


  7. Remove the board (4). Remove the cables that connect to the board (4). Remove the four nuts that hold the board (4) to the white standoffs.

  8. Remove the "Q1L" cable from the bottom of the static switches (6). Remove the "Q2L" cable from the bottom of the static switches (6). Remove the "Q3L" cable from the bottom of the static switches (6).

  9. Remove the four bolts that attach the assembly (1) to the right panel.

  10. Remove the assembly (1) from the cabinet.

Installation Procedure for the Assembly

  1. Position the assembly (1) in the cabinet.

  2. Attach the assembly (1) to the right panel with the four bolts.

  3. Attach the "Q1L" cable from the bottom of the static switches (6). Attach the "Q2L" cable from the bottom of the static switches (6). Attach the "Q3L" cable from the bottom of the static switches (6). Attach the four nuts that hold the board (4) to the white standoffs. Attach the cables that connect to the board.

  4. Attach the "F1H" cable from the top of the fuses (2). Attach the "F2H" cable from the top of the fuses (2). Attach the "F3H" cable from the top of the fuses (2).

  5. Attach the "A1" contactor control and sense wire from the contactor "K4". Attach the "A2" contactor control and sense wire from the contactor "K4". Attach the "13" contactor control and sense wire from the contactor "K4". Attach the "14" contactor control and sense wire from the contactor "K4".

  6. Connect the "F3 NC" wire that connects to the fuse sensors. Connect the "F1 COM" wire that connects to the fuse sensors.

  7. Attach the "J1" connector from the board (4). Attach the "J7" connector from the board (4).

  8. Tie-wrap the cables.

  9. Attach the shield that covers the assembly (1).

Removal Procedure for a Fuse

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 wires to the fuse sensor. Verify the labeling on the wires with the location of the wires.

  2. Remove the upper nuts and the lower nuts that attach the fuse and the cable to the standoff. Verify the labeling on the cable.

Installation Procedure for a Fuse

  1. Position the fuse in the cabinet over the standoffs that are connected to the right panel.

  2. Attach the fuse and the cable to the standoff with a nut and a washer.

  3. Attach the wires to the fuse sensor. Refer to Illustration 3 for wire connections.

Removal Procedure for the Board

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.



    Illustration 4g01275118
    Static Switch Interface Board (SSI)


    NOTICE

    Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. When not in use, keep the module in its static-shield bag. Follow these guidelines when you handle any module:

    Touch a grounded object to discharge static potential.

    Wear an approved wrist-strap grounding device.

    Do not touch the bus connector or connector pins.

    Do not touch circuit components inside the module.

    If available, use a static-safe work station.


  1. Disconnect all connectors. Verify the labeling of the connectors with the location of the connectors. Refer to Illustration 4.

  2. Disconnect the four nuts that hold the board to the plastic standoff on the right panel.

Installation Procedure for the Board


    NOTICE

    Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. When not in use, keep the module in its static-shield bag. Follow these guidelines when you handle any module:

    Touch a grounded object to discharge static potential.

    Wear an approved wrist-strap grounding device.

    Do not touch the bus connector or connector pins.

    Do not touch circuit components inside the module.

    If available, use a static-safe work station.


  1. Position the board in the cabinet over the white standoffs that are connected to the right panel.

  2. Attach the board to the standoffs with the four nuts.

  3. Connect the wire connectors into the correct connectors on the board. Verify the labeling of the connectors with the location of the connectors. Refer to Illustration 4.

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