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9 SERVICING
9 SERVICING 9.1 SPARES
There are two servicing methods for the LPS-D:
•
Spare board replacement.
•
Component level repair.
The preferred method is board replacement using the LPS-D 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 trouble-shoot 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-D 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.
Power down the relay by turning off the front panel power switch and disconnecting power
from the rear connector before disassembling the unit. High voltage levels can be accessed at
the power supply inputs.
CAUTION
The LPS-D automatically performs tests of major functions and critical hardware components and reports their
status via the LUI Display, status LED and the non-critical and critical alarm contacts. The failure report is
dependent on the type or level of the failure. Some failures operate the critical alarm contact and the status
LED, while others only operate the non-critical alarm contact.
There are three levels of self-test performed by the LPS-D:
1. The first level indicates severe relaying failures, indicated by a FAIL message on the display, the critical
alarm contact opening, and the status LED turning red. These failures indicate that the relay is not provid-
ing protection.
2. The second level displays warning messages. They are indicated by a WARN message on the display and
closure of the non-critical alarm contact. These failures indicate that the relay is still providing some degree
of protection.
3. The third level indicates system status errors that are due to power system errors (Trip Circuit Open) or are
caused by an LPS-D command that disables the relay (Disable Outputs). They are indicated by the closing
of the non-critical alarm contact, a red LED, or by the opening of the critical alarm contact. However, noth-
ing is displayed until the Information Status command is issued.
The types of self-tests performed are described in the Chapter 1: PRODUCT DESCRIPTION. The components
tested during the start-up self-tests are listed in Table 9–1. The components tested during run-time background
and foreground self-tests are listed in Tables 9–2 and 9–3, respectively.
GE Power Management
9.1.2 SERVICING WITH THE RELAY SELF-TEST
LPS-D Line Protection System
9.1 SPARES
9.1.1 DESCRIPTION
9
9-
1
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