CHAPTER 7: COMMANDS AND TARGETS
TARGETS
F35 MULTIPLE FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
7-13
7
To further isolate AC input discrepancy errors, put the relay in test-isolated mode, then one by one, temporally change
an AC bank Crosschecking setting to None, until the Process Bus Failure clears. Once the problem AC bank has been
identified, the values from each of the two Bricks can be examined individually by temporarily mapping each to an AC
bank with a single origin.
7.2.2.5 HardFiber minor self-test error messages
•
Description of problem
: Communications problems with one or more Bricks. The text of the message identifies the
affected field units. This self-test is initiated by low received signal levels at either the Brick or Process Card end, and
by the sustained failure to receive poll responses from the proper Brick.
•
Severity
: This self-test error does not directly inhibit protection. However, the affected Brick inputs/outputs may not be
available to the UR device.
•
What to do
: Check the field unit actual values. An indication of equipment mismatch means that messages are being
received from a Brick, but there is a discrepancy between the settings and the actual Brick serial number, order code,
and/or core number. Check that the correct core on the correct Brick is patched through to the correct Process Card
port, and that the field unit settings are correct. An indication of communications loss means that no messages are
being received. Check that the patching is correct, and that the Brick has power. If that is not the problem, use a
professional optical fiber connector cleaning kit to clean both sides of all optical fiber connections from the Process
Card through to the affected Brick. If the problem continues after cleaning, consult the factory.
•
Description of problem
: Brick internal self-testing has detected trouble internal to the Brick.
•
Severity
: This self-test error does not directly inhibit protection. However, some or all of the affected Brick inputs/
outputs may not be available to the UR device.
•
What to do
: Check the Brick environment for over/under temperatures and the voltage of its power source. If the
ambient temperature and supply voltage are within Brick specifications, consult the factory. Troubles resulting from a
Brick output failing to respond to an output command can only be detected while the command is active, and so in
this case the target is latched. A latched target can be unlatched by pressing the front panel reset key if the command
has ended, however the output can still be non-functional.
PROCESS BUS TROUBLE
BRICK TROUBLE
