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LOCAL TRENDING
Local trending is done inside the controller where up
to 1000 samples can be stored in memory. GenLink
provides an interface to select the analog channels to
be trended, the rate to be sampled at, and optional
triggers to be used to specify when to sample. Up to 6
analog channels can be sampled. However, the 1000
samples are divided by the number of channels. For
example, there will be 1000 samples of 1 channel or
only 166 samples of each of 6 channels. The analog
samples can be sampled at one of three basic polling
rates: Low Speed, Mid Speed, and High Speed. For
the Low Speed and Mid Speed modes, there are also
several settings that can be used to determine when
to sample. GenLink can save the data to a file and/or
display it as a snap-shot graph. The file is MS Excel
compatible ( CSV format ).
GENLINK LOCAL TRENDING SETUP
When setting up the local trending, verify that the
"Armed" box is unchecked and press "Apply". To
change the settings with the trending armed may
result in corrupted data. Select a rate at which to
take samples.
•
Low Speed rate samples the processed analog
channel values at a rate that is able to be set in
increments of 0.1 seconds.
•
Mid Speed rate is about 2 milliseconds which
captures the new analog channel value as soon
as it is processed by the measurement and alarm
modules.
•
High Speed rate is 0.4 milliseconds and is reserved
for the raw AC wave forms of generator voltage and
current.
There are 6 pull-down boxes that allow the selection of
up to 6 analog channels. All channel pull-down boxes
after the first pull-down box with NULL CHANNEL
selected are ignored. If High Speed is selected, the
pull-down boxes are not used. Instead, there are 6
check boxes that can be used to select which voltage
and current lines are to be trended.
The "Capture When" pull-down box allows the trend-
ing to be limited to the engine running or engine being
stopped. If the "Stop at End of Buffer" box is selected,
then the trending will start when the "Capture When"
condition is true and stop when the 1000 samples
have been taken.
Any digital or analog channel can be used as an event
trigger. The event trigger needs to be set up in that
channel's setup screen. Checking the "Capture Only
When Trigger is True" box will cause the samples to
only be taken while the event trigger is true. Checking
the "Capture on Shutdown Alarm" will cause the sam-
ples to start upon the setting of a shutdown alarm.
The event trigger can be used to start sampling, stop
sampling, or center the sampling by selecting the
appropriate radio button:
10
General Information
H-100 Control Panel Technical Manual
No Trigger
The event trigger is ignored and samples are continu-
ally being placed into the buffer.
Pre-Trigger
Samples are continually being placed into the buffer
until the event trigger becomes true. Then no more
samples are placed into the buffer.
Post-Trigger
No samples are placed into the buffer until the event
trigger becomes true. Then samples are placed in the
buffer until it is full.
Pre- and Post-Trigger
Samples are continually being placed in the buffer
until the event trigger becomes true. This point is
considered ½ of the buffer. Samples continue to be
placed into the buffer until it is full.
Pressing the "View" button will show a graph of
the samples in the buffer at the time the button is
pressed. The graph has a "Save" button that allows
the user to save the data out to a file in a MS Excel
compatible ( CSV ) format.
THE ILC
The built-in ILC uses simple combinatorial logic to
generate digital outputs and limited generator con-
trol. The ILC uses ladder logic for programming,
and a separate offline programming tool is avail-
able to generate the ILC programs. These are then
downloaded via GenLink and are started or stopped
by means of a checkbox on the GenLink ILC page.
Once downloaded and started, they will remain active
unless they are stopped via GenLink, even if power
is cycled.
The I/O scan time of the ILC is about 100 ms worst
case. This means that all inputs and outputs are
scanned within 100 ms. Also, the ILC processes
one rung every 5 ms, so 5 rungs will take 25 ms.
However, this is in parallel with the I/O scan and not
added to it.
The offline tool uses graphic symbols to design the
"rungs" of the ladder logic. The rungs are simple and
can only have 2 combinatorial elements in them, but
by the use of "soft contacts" the output of one rung
can be fed into the input of another to provide more
combinations. As well as the logical combinations,
there are also analog comparisons, counters and tim-
ers available for use in the rungs. As an example this
allows the following type of logic to be built:
IF (in automatic) AND (engine running) AND (air
temperature >25 deg) FOR (20 seconds) THEN
OPERATE (output 7).
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