
TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01
B-9
Monday
, November 26, 2001 1:09 pm
Backplane Board
Registration Errors
It is possible that a backplane board (VME Bus, slots 1 through 12) in the
TDR9000 can fail in such a way that the board is not recognized by the
Instrument. If this happens, there is no failure indication at power up, nor
will the Self-Diagnostics test report a failure. All built-in tests require that
the relevant backplane board be recognized in the fIrst place.
This condition can be detected in two ways:
• Observe the Virtual Front Panel, and compare it to the Physical
Front Panel of the TDR9000. If there is a front panel module (or
modules) on the Instrument that is not being represented on the
VFP, one or more of the backplane boards associated with that
module may not be registered. This can be a result of damaged
connectors or poor seating of the board in the backplane; or, the
board’s electronics may have a problem.
• Use the diagram shown in Figure B.12 on page B-16 to determine
which board is causing the problem. A backplane board that is
not registered will not display a green LED indication. Before
replacing the board, check the integrity of the connectors, and if
the connectors appear to be OK, try reseating the board.
N
OTE
It is possible that failure in a Physical Front Panel module may cause the
same symptom as in the first bullet. If the LEDs on the associated
backplane boards appear OK (green), then the Physical Front Panel
module is suspect.
Cable-In Bits
Failure
This failure occurred in several early units because the cable-in sense bit
inputs on the EHV module front panel connectors were not sufficiently
protected against extreme high levels of Electro-Static Discharge (ESD).
The damaged units had been used in EHV transmission yards, where ESD
is most severe.
The most common symptom was that one or more cable-in bits failed in
an
active
condition, giving the false indication that an EHV cable (or
cables) was connected when it was not. This did not prevent the
Instrument from being used to perform EHV testing. It did prevent the
Instrument from being used for OCB testing, because there is a
crosscheck in the firmware that does not allow a test to be run when the
Instrument thinks that both OCB and EHV cables are connected.
Damaged cable-in bit circuitry is not detected as part of the
Self-Diagnostics test, and will most likely to be detected while attempting
to perform an OCB test. It can also be detected by observing that the
Virtual Front Panel indicates
channel ready
status on EHV connectors
that have no cable attached.
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