JOHNSON CONTROLS
93
SECTION 2 - OPTIVIEW OPERATION
FORM 160.10-O1
ISSUE DATE: 4/27/2018
2
end of the X-axis, if “One Screen” is selected, trending
stops and data is frozen. If “Continuous” is selected,
the oldest data is dropped from the left-hand side of
the graph at the next collection interval. Thereafter, the
oldest data is dropped from the left hand-side of the
graph at each data collection interval.
If a power failure occurs while the trend feature is
running, the trending is stopped. Upon restoration of
power, the last screen of data that was collected will be
displayed on the trending screen. The “Start” key must
be pressed to initiate a new trend screen.
DISPLAY ONLY
This screen allows the user to view the graphical trend-
ing of the selected parameters and is also a gateway to
the trend setup screens.
A red screen with the words “TREND
MAX MUST BE > TREND MIN” will
appear if the Y-Axis minimum has been
programmed to a value that is greater
than the Y-Axis maximum for any param-
eter. If this appears, proceed to the Trend
Setup screen to change the values.
OVERVIEW
The Trend screen allows as many as six operator-se-
lected parameters (Data Points) to be plotted in an X/Y
graph format. This is useful for monitoring chiller per-
formance. The X-Axis is scaled per the selected data
collection interval and displayed in a time of day or
elapsed time format, as selected with the X-axis key.
The Y-Axis is scaled for each parameter as per the op-
erator programmed minimum and maximum value.
Only one Y-Axis label is displayed at a time. For ease
of identification, each plotted parameter and associated
Y-Axis labeling is color coordinated.
Analog parameters are scaled in pressure, temperature,
volts, amps, hertz or time. Digital parameters are scaled
as zero (off) and one (on). The parameters are sampled
at the selected data collection interval and plotted using
450 data points across the X-Axis. If the actual value
of the sampled parameter is less than the Y-Axis label
minimum for that parameter, the value will be plotted
at the minimum value. Similarly, if the actual value is
greater than the Y-Axis label maximum for that param-
eter, the value will be plotted at the maximum value.
There are two types of charts that can be created: “One
Screen” and “Continuous”. When plotting reaches the
TREND SCREEN
LD10015
FIGURE 40 - TREND SCREEN
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