Laversab 6300-M4, Руководство пользователя

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6300-M4 is isolated from the output during Measure or Leak modes, it will usually be at a
pressure quite different from that at the output. Simply introducing the controlling section
into the pneumatic system connected to the output will cause a surge in pressure (or vacuum)
at the output. To prevent such a surge, the 6300-M4 measures the pressure at the output,
shuts-off the output from the internal 6300-M4 pneumatics, and then controls the pressure
within the internal control mechanism to match the pressure at the output. Once this is done,
the 6300-M4 controlling section is connected to the output. This process is termed as
Equalization.
While the 6300-M4 is undergoing this process, the term 'EQZN' is displayed on the main
screen in place of the “Actual” value. The whole process usually takes about 15 seconds or
less to complete. During the ‘EQZN’ process, the Main Operating screen will appear as
shown below.
Units: knots Feet/min Feet
Actual: C EQZN EQZN EQZN C
Target: 20.0 3000 0
Once the Equalization process is complete, the Actual values appear on the Main Screen.
Following the Equalization process,
only when the actual value on the Static output is less
than 2000 feet from Ground and the Pitot output is less than 150 knots, the 6300-M4 will
automatically inject a small vacuum on the Static output and a small pressure on the Pitot
output. This is done to determine the volume of the Pitot and Static system on the aircraft, so
that the 6300-M4 can automatically adjust the gain of it’s control mechanism. Due to this, the
actual value will always increase in both altitude and in knots for about 5 seconds, regardless
of the target value. Once this process is complete, the actual values will move towards the
target values.
This process is part of the “Measure” (or “Leak”) to “Control” transition, and will take place
only when the transition to “Control” takes place within 2000 feet of Ground and 150 knots.
3.3 LEAK SCREEN
Although most of the operation of the 6300-M4 will be performed while in the Main
Operating Screen described above, at times, the Leak Screen is also accessed. When either of
the Pitot or Static outputs is put into the “Leak” mode (after pressing GO), the display
changes to the Leak Screen. A sample Static Leak Screen is shown below.