Technical Manual
Page 20
4.Po
Pressure Sensor Offset
4.Pr
Pressure Sensor Range
4.Cf
Control function
Determines if the DCO maintains control of the
compressors when the DCO is stopped.
Note : This applies only when connection is
made via airbus485
0 = Stop: return pressure control to the
compressors.
1 = Standby: maintain control and continouosly
hold compressors “off load”.
4.LP
Limited Permissible
Determines how many compressors are
allowed to be used by the DCO.
Note : This function is limited by 'nC' Number
of compressors.
Pressure Sensor Calibration Procedure:
1) Commissioning
Initially set the ‘Offset’ (minimum) to the
minimum or lowest pressure value for the
sensor. Set the ‘Range’ (maximum) to the
maximum or highest value for the sensor.
For example:
If the pressure sensor is a 0 to 16bar (0 to
232psi) type set the ‘offset’ to 0bar (0psi) and
the ‘Range’ to 16.0bar (232psi).
If the sensor is a –1.0(minus one bar.g) to
15.0bar type, set the ‘offset’ to –1.0bar (minus
one bar) and the range to 15.0bar.
Note: The ‘range’ value equates to the
maximum value not the scope of the sensor.
Execute the calibration procedure.
2) Calibration Procedure
a) Offset: Expose the sensor to atmosphere
and adjust the ‘offset’ setting (if necessary)
until the detected pressure display shows
0.0bar (0psi).
b) Range: Apply an accurately know pressure
to the pressure sensor and adjust the ‘Range’
setting until the detected pressure display
matches the applied pressure. An applied
pressure equal too, or greater than, the
nominal system working pressure is
recommended.
The detected pressure is displayed with the
calibration menu item and will change to match
the new calibration setting as the setting is
adjusted.
There is no need for the applied pressure to
be static; it can be dynamic and changing. This
enables calibration to be carried out on a fully
operational system where changing system
pressure can be accurately verified from
another source.
Correct pressure sensor set-up and
calibration is critical for successful system
operation. It is recommended that pressure
sensor calibration is examined, and
adjusted if necessary, manually or a pre-
determined routine periodic basis.
