11
7
Fault and Fault Finding
Should the Nexus determine a fault has occurred that required the burner be shut down, the bottom portion of
the display will indicate the cause. Pressing the
ENGINEERS
key will display more information, which will be
found in the upper right of the display. See Section 6.0 of Fireye Bulletin PPC-6001 for more details. Using the
ENGINEERS
key the last 33 faults or limits can be reviewed. The fault history begins with the most recent
which can be found after
EK200
and will be date and time stamped. There are three aspects to each record;
when it was reset, when it changed from a fault to a cleared fault and when the fault occurred. The portion of
the record at the
“Fxx”
will also include the subset if any.
See Fault Subsets.
Many of the faults detected and displayed by the unit will cause a safety shutdown of the burner. Other faults
will be displayed as a warning, but operation of the burner will not be affected.
All fault numbers are prefixed by a letter. This letter describes the status of the fault:
F -
This means that a fault (e.g. PSU calibration fault) has occurred and is still present. The fault
may be internal or external to the unit.
L -
This means that an alarm limit fault (e.g. smoke level exceeding the high limit) has occurred
and is still present.
C -
This means that a fault or alarm limit did occur but has been cleared.
For example:
F60 - Means fault 60 has occurred and still exists.
L75 - Means alarm limit 75 has been exceeded and is still being exceeded
C73 - Means fault or alarm limit 73 has occurred but has subsequently been cleared.
When the unit is in a safety shutdown state both the controlled shutdown triac and safety shutdown relay will
be turned off, to prevent the burner from firing.
8 Fault
subsets
As an aid to fault finding, most faults have a
fault subset
that gives additional information about the type of fault
or what the burner was doing when the fault occurred. Where applicable, the subsets are given in the fault
listing in section 6 - Faults and Fault Finding, of Fireye Bulletin PPC6001. For details of how to view a subset,
refer to Section 6.0 of this bulletin or Fireye Bulletin PPC6001.
Summary of Contents for PPC6000 Series
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