Komatsu 830E, Shop Manual

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E02016 2/02 Electrical Propulsion Components E2-9
FRAMES
Every few seconds the system also collects “frames”
which are bits of time. The time duration of each frame
is set using the PTU, in increments of 0.01 seconds.
Frames are collected right after all of the systems'
input/output functions (events) are complete, as a
record of system function at the time of the event.
Each frame contains 40 floating point values, all digital
input and output values, the state machine's current
state at the time of the event.
Each time an event is reported, a frame (known as the
trigger frame) is kept for that event until the event is
erased.
WINDOWS
Some events may also have frame “windows” - a col-
lection of 51 frames, that is, all the frames that occur
for 40 frames before the event, a frame at the event,
and 10 frames after the event.
The system will save each event window for the first 16
events that are qualified to have windows. They will be
saved until the event is erased. After 16 windows are
stored, no additional windows can be stored.
SYSTEM CATEGORIES
All of the possible events which can occur have been
programmed to fall into eight different categories, to
enable the system to respond correctly. They are:
Active Events Count
This is the current number of events of this type
which are “active”, i.e., which may affect truck
operation.
Decay Active Events Count Time
This is the time in seconds which specified the rate
at which the Active Events Count “decays”, allow-
ing a certain number of events to occur ”normally”
over a given time frame without affecting truck
operation.
Lockout DOS Limit
This controls how often a truck operator may reset
the operating restrictions caused by an event type,
using the Dump Override Switch (DOS) switch in
the cab.
If the Active Events Count is equal to the Lockout
DOS Limit for a given type, the Override switch
(DOS) will have no effect on operating restrictions
caused by that event. The Active Events Count (for
that type) will not be decayed by the Decay Active
Events Count.
Running Count
This is the total count of all events of this type seen
since Running Count was last cleared by the PTU.
Life Count
This is the total count of all events of this type ever
recorded. The maximum number which can be
recorded is 4,294,967,295. When this number is
reached, the count will roll over.
Accept Limit
This is the number of events of this type that will be
recorded by the system. See the discussion under
Limits On Resetting Faults.
Window Captures Allowed Limit
This tells how many windows will be captured for
events of this type, subject to space restrictions.
When the window capture limit is exceeded, only a
single frame of data is saved.
Window Captures Count
This is the count of windows saved for this event
type. This value is incremented by 1 each time a
window is saved for this event type. It is decre-
mented or cleared when events are cleared by the
PTU.
LIMITS ON RESETTING FAULTS
In the fault system, there are three limits associated
with resetting faults:
Accept limit (accept_limit)
This is the limit on the number of faults which may
be stored. When the limit of a given fault is
exceeded, the oldest event of this type recorded
without a window will be replaced with the new
event, it will not be overwritten. The system does
not allow events with windows to be overwritten. If
the oldest event has a window, the oldest non-win-
dow event will be overwritten.