Chapter Six: Operation in Tuning Mode
General Information
161
If the system is operating far below set point, there will be a large change in pressure between
screen refreshing because the system will be quickly moving towards set point. Within the
one-third second time frame, the deviation could range from - 22% (at the beginning of the time
frame), to - 4% (at the end of the time frame). In this case, the middle three segments in the
lower half of the deviation indicator light up (refer Figure 44, page 160).
As another example, assume there is pressure oscillation above and below set point. Upper and
lower deviation indicator segments light up to indicate over and under pressure readings. In
effect, the deviation indicator provides similar information to that provided by an oscilloscope.
If the oscillation continues, it is possible that reducing the Gain setting may improve system
stability. When the system does stabilize, none of the deviation indicators are lit.
When the Set Point is 0:
If the set point is 0 and the pressure reading is 0, no segments light up.
If the set point is 0 and the pressure is above 0, the uppermost segment lights up.
If the set point is 0 and the pressure is below 0, the lowermost segment lights up.
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