GE Power Management LPS-O Line Protection System 9-
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9 SERVICING 9.1 SPARES
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9 SERVICING 9.1 SPARES 9.1.1 DESCRIPTION
There are two servicing methods for the LPS-O:
• Spare board replacement.
• Component level repair.
The preferred method is board replacement using the LPS-O automatic self-tests to isolate failed boards.
When the defective board is found, it can be replaced with a spare, and the system can be returned to service.
This method typically yields the shortest system down-time. To further reduce down-time, we recommend
keeping a complete set of spare boards at the maintenance center.
We do not recommend servicing the relay at the component level. This requires a substantial investment in test
and repair equipment and in technical expertise, and usually results in longer down-time than board replace-
ment. For those who do wish to troubleshoot to the component level, drawings can be requested from the fac-
tory. When you request drawings, you must supply the following information:
• The name of the board. This is found on the component side of the printed circuit board with the assembly
number and revision.
• The assembly number of the LPS-O is an eight-digit number with a letter inserted between the fourth and
fifth digit and with a group-identification suffix, such as 0215B8011G001.
• The revision number is found adjacent to the assembly number of the board.
CAUTION: Power down the relay by turning off the front panel power switch and disconnect-
ing power from the rear connector before disassembling the unit. High voltage levels can be
accessed at the power supply inputs.
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