Fault Isolation; Stored Faults - Comtech EF Data KST-2000L Installation And Operation Manual

Satellite Terminal System
Fault Indication and Isolation
5.2

Fault Isolation

System faults are reported on the fault log screen in the Windows™ based remote M&C
software. (Alternatively, they may be viewed in the terminal mode as shown in
Chapter 7). Chapter 7 lists the KST-2000L faults and their indication in the LEDs and re-
lays. In some cases, items listed in Chapter 7 give no LED or relay indication when they
occur because they are not equipment faults but are useful for troubleshooting problems.
5.3
Each of the major modules within the KST-2000L (up converter, down converter, HPA,
LNB, and Reference), together with the AGC function and the Common Equipment, re-
port their individual fault status to the main M&C. Each time there is a change in the fault
status, that status is stored in a non-volatile memory on the main M&C. Note that each
event corresponds to a change in status. Therefore, when a fault occurs, that constitutes
one status change, and when that fault clears, another event occurs. The M&C can store
up to ten fault status conditions.
After ten fault status changes are logged, no further logging can take place until the Clear
Stored Faults (<add/CLSF) command is issued. Refer to Appendix B, Table B-7 for the
fault commands to access the fault status of each function. When the fault status is que-
ried, such as <add/HS_, the response returned will indicate how many stored faults are
actually stored. To retrieve the individual fault status, issue the appropriate stored fault
command with the corresponding stored fault number, such as <add/HSF_2. That particu-
lar fault condition will be returned. Note that the stored fault numbers (locations) are
0 through 9 inclusive.
It is good maintenance practice to query the stored faults and record them in a logbook or
other permanent record and then issue the clear stored fault command, <add/CLSF_.
There is no time stamp associated with these stored faults. Noting them in a logbook is
the only way to establish an approximate time reference,.

Stored Faults

5–2
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MN/KST2000L.IOM