Electromagnetic Interface (EMI) Board with GND Capacitors and Discharge Resistors
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| Illustration 1 | g03691827 |
| (1) Electromagnetic interface (EMI) board location | |
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| Illustration 2 | g03691833 |
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Electromagnetic interface (EMI) board, with 3-ph GND capacitors and discharge resistors | |
The electromagnetic interface (EMI) board is equipped with 3-ph ground capacitors and discharge resistors. The board is located behind the left door panel in the SIO cabinet. The EMI board reduces conducted EMI transmissions in the UPS system.
- Refer to Systems Operation, Test and Adjust, UENR4695, "Internal Component Pre-Removal Steps". Perform the internal component pre-removal procedure to shut down the system and to gain access to internal components.
The SIO cabinet must be de-energized before removal steps can be performed.
- Disconnect phase-A, phase-B, and phase-C connectors from the board. Each connector is labeled to ensure correct location. Verify that each connector has a label and is legible.
- Remove the three screws next to the AC filter capacitor to release the board.
- Position the board in the cabinet over the mounting holes.
- Attach the three screws next to the AC filter capacitor to install the board.
- Plug phase-A, phase-B, and phase-C connectors into the correct locations on the board. Check the labels on each connector to ensure that each connector has been installed in the correct location.
Electromagnetic Interface (EMI) Board
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| Illustration 3 | g03692176 |
| (4) Electromagnetic interface boards | |
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| Illustration 4 | g03692177 |
The electromagnetic interface (EMI) boards are located on the left side of the SIO cabinet next to the utility bus bars. There are six boards total, one for phase-A, phase-B, phase-C, input, and output. The EMI boards reduce conducted EMI transmissions in the UPS cabinet.
- Refer to Systems Operation, Test and Adjust, UENR4695, "Internal Component Pre-Removal Steps". Perform the internal component pre-removal procedure to shut down the system and to gain access to internal components.
The SIO cabinet must be de-energized before removal steps can be performed.
- Remove six the Keps nuts from the board.
- Remove board.
- Position the board in the cabinet over the mounting holes.
- Attach the six Keps nuts.
- Torque the nuts to
4 N·m (35 lb in) .