Faults 2-79
new fault is logged into the queue each existing entry will be shifted up by
one (i.e. previous entry #1 will move to entry #2, previous entry #2 will
move to entry #3, etc.). If the queue is full when a fault occurs the oldest
entry will be discarded.
The fault queue will be saved in nonvolatile storage at power loss, thus
retaining its contents through a power off - on cycle
The fault code for each entry can be read via a corresponding output
(read-only) parameter. Viewed in this manner (i.e. as a parameter) a
numeric fault code is presented - i.e. no text string. This was decided to
provide consistent fault indication between the LED and LCD HIM
peripherals.
A text string of up to 16 characters is presented when accessing the fault
queue via a DPI peripheral, which can present the fault queue to the user
rather than through parameters.
Time
[Fault 1-8 Time]
Time Stamp Value
The time stamp value recorded in the fault queue is the value of an internal
drive-under-power-timer at the time of the fault. At drive power-up, this
internal value is copied to [PowerUp Marker]. The fault queue time stamp
can then be compared to determine when the fault occurred relative to the
last drive power-up. The user has no control over the value of the internal
drive under power timer, which will increment in value over the life of the
power structure (saved in nonvolatile storage on the power structure, not the
Control Board).
The time stamp for each fault queue entry can be read via a corresponding
parameter. The time stamp value will be presented in xxx.yyyy hours (4
decimal places). Each increment of 1 will represent approximately 0.36
seconds. Internally it will be accumulated in a 32-bit unsigned integer with
a resolution of 0.35 seconds, resulting in a rollover to zero every 47.66
years. Time comparisons of one fault to the next and/or with [PowerUp
Marker] are only meaningful if they occur less than or equal to the rollover
range.
Resetting or Clearing a Fault
A latched fault condition can be cleared by the following:
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