Learn how to remove and replace the Danisense DM1200UB current transducer (part number 788929-01). The DM1200UB is attached to the mass interconnect folding panel.

Equipment

  • Torque driver, N · m or lb · in.
    • 3/32 hex bit
    • 3 mm hex bit
    • #2 Phillips bit
  • Torque wrench, N · m or lb · in.
    • 7 mm socket wrench bit
    • 10 mm socket wrench bit
  • 7 mm wrench
  • 10 mm wrench
  • Small flathead screwdriver
  • Large flathead screwdriver
  • Tray for loose fastening hardware

Torque the fasteners to the following specifications:

  • VPC module mounting screws: 0.45 N · m (4.0 lb · in.)
  • M4 nut: 1.96 N · m (17.3 lb · in.)
  • M5 pan head and nut: 4.01 N · m (35.4 lb · in.)
  • M6 hex head: 6.83 N · m (60.4 lb · in.)
  • 10-32 pan head: 3.16 N · m (27.9 lb · in.)
  1. Follow all Before Maintenance or Repair procedures.
  2. While facing the mass interconnect, remove the right-side panel from the system.
    1. Quarter turn all of the hex head fasteners using the 3 mm hex bit.
    2. Push the sliding latches toward each other, lift the side panel, and pull the side panel off.
  3. While facing the mass interconnect, complete the following steps:
    1. Remove the screws containing the lowest 8U filler panel using the #2 Phillips bit.
    2. Unlock and open the door above the mass interconnect using the large flathead screwdriver.
  4. Open the mass interconnect folding panel.
    1. Use the 3/32 hex bit to unfasten the VPC modules in mass interconnect slots 1, 2, 4, 6, 9, 11, 12, 13, 15, 17, and 18.
    2. Turn and push the VPC modules through the mass interconnect so that they are inside the system rack.
      If necessary, remove as many filler panels as needed.
    3. Unfasten the four 10-32 screws securing the top of the folding panel to the system rack using the #2 Phillips bit.
    4. Pull the folding panel handle gently until the folding panel is opened to a maximum of 60°.
  5. Remove the bolt and nut securing the 2 AWG red wire passing through the center of the current transducer at 16U using the 10 mm wrench set.
  6. Pull the 2 AWG red wire through the top of the current transducer.
  7. Remove the following cables from the DM1200UB current transducer:
    1. Disconnect the DB9 cable with a small flathead screwdriver.
    2. Disconnect the BNC plug by pushing it in, turning it 90° counterclockwise, and pulling it out.
  8. Remove the current transducer bracket.
    1. Identify the bracket mounted below the gas springs of the folding panel that secures the DM1200UB current transducer.
    2. Remove the two M5 screws and use the 8 mm socket bit to remove the two M5 nuts on either side of the bracket using the #2 Phillips bit.
    3. Pull the transducer bracket up to lift the bracket from the cradling screws that previously held the M5 nuts.
    4. Pull the transducer bracket away from the folding panel assembly and out of the system rack through the side panel.
  9. Set the current transducer bracket on a table so that you have access to the bottom of the current transducer.
  10. Unfasten the four M4 nuts holding the current transducer to the bracket using the 7 mm socket bit.
  11. Pull the current transducer out of the system rack.
Follow the removal instructions in reverse order with a new DM1200UB current transducer.
Note Ensure that the red 2 AWG wire goes through the hole in the current transducer.
Note Populate the VPC modules and filler panels into the mass interconnect in the same way they were populated before removal.