Section 2
SEQUENCING WITH
MULTIPLE CONTROLLERS
12
NOTE
When a machine is permanently removed from a sequence, the COM NUMBERS
should be reassigned to the remaining machines and the LAST COM value
must be changed to match the total number of machines still in the sequence.
NOTE
All program changes must be accomplished while the machine is manually
stopped.
2.13 CALIBRATION OF P2 PRESSURE TRANSDUCERS
Each individual compressor is equipped with a pressure transducer. Over time, it is
possible that the reading from one machine’s pressure transducer may read differently
from another machine. Prior to sequencing and periodically, Controllers should be
calibrated to reflect the same measurement of P2 pressure through out the system.
Perform the calibration when the system is at a stable pressure.
2.13.1 SUPERVISOR P2 PRESSURE TRANSDUCER CALIBRATION
Perform the following steps to calibrate the Supervisor Controller P2 pressure reading:
1. Measure the pressure using an independent certified gauge.
2. Enter the password to access the Supervisor Calibration menu.
a. If the password is not equal to zero, navigate to the password line.
b. Press the ENTER
key.
c. Enter a value that is four more than the existing number.
d. Press the ENTER
key. The number should go to zero.
e. Repeat this process if a keying error occurs that does not release the password.
3. Change the calibration parameter for P2 so that the Pressure value at the Supervisor
reads the same as the gauge.
a. Use the Down
arrow key to navigate to the line that reads CAL P2. The
display will show the current P2 reading and the calibration parameter (+7 to -7).
b. Press the ENTER
key to adjust the value.
c. Use the Up
arrow key to increase the reading and the Down arrow key to
decrease the reading.
d. Press the ENTER
key. The Enter key must be pressed after setting the
calibration parameter to make it permanent.
e. Return to the main display by pressing ESC.
4. Recheck the pressure to ensure the display reading is correct.
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