Hydronix Hydro-Control VI, Руководство оператора

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Using Moisture Control Chapter 8
54 Hydro-Control VI Operators Guide HD0456 Rev 1.7.1
After the recipe has been setup, run the mix and then adjust the quantity of water as in the
normal calibration in order to get a good mix at the end of the batch.
Once a good mix has been obtained then the calibration can be performed from the mix log
using the same procedure as a normal mix.
5 Auto-Track
Auto-track is an alternative to using defined mixing times and allows the Hydro-Control to
automatically adjust the mix time for each phase so that it will finish mixing when the deviation in
the sensor value is within the user defined Auto-track parameters set in the Recipe . This is useful
if variation in the raw materials causes differences in the mixer action which then varies the time
taken to homogenise the material.
There are separate Auto-track parameters for the Dry Mix phase and the Wet Mix phase. These
consist of an Auto-track Time and an Auto-track Deviation. The sensor signal must remain within
the Auto-track Deviation for the duration of the Auto-track Time before moving to the next mixing
phase.
Auto-Track
Dry Mix
Time
Auto-track
Dry Mix
Deviation
Moisture
Time
Recipe Dry Mix Time
Dry Mix
Finishes
Auto-track
starts
Auto-Track
Dry Mix
Time
Figure 29: Mix trace showing the Auto-track function
Figure 29 shows the mix trace for a Dry Mix phase using the Auto-track feature. The Auto-track
feature is enabled at the point Dry Mix Time – Auto-track Time. It will then continue to mix until the
Auto-track parameters are met or to the end of Dry Mix Time.
The Auto-track monitors the sensor values. If the value falls outside of the Auto-track Mix Deviation
parameter the Auto-track timer is reset as shown in the inset diagram in Figure 29. If during the
mixing phase the values remain within the Auto-track Mix Deviation parameter for the defined
Auto-track Mix Time then the Hydro-Control continues to the next phase.
If the Auto-track deviation parameters are not met within the allotted Dry Mix Time the system
repeats the mixing phase a second time. If after a second Dry Mix time sufficient stability has not
been achieved the Hydro-Control will alarm ‘Max Dry Mix Time Reached’ or ‘Max Wet Mix Time
Reached’ if during the Wet Mix phase. The operator will then be prompted to either stop the mixing
phase and move on to the next phase or repeat the mixing time. If the mix time is repeated then
the Hydro-Control will automatically update the mix time in the recipe so that the next time it is run
the longer mixing time is used.
5.1
Considerations When Setting up Auto-track
The following points should be considered when setting up Auto-track.
•
Dry Mix Time should be set to half the overall anticipated dry mixing time.
• In CALC Mode the Auto-track Mix Deviation should be set small enough to ensure a
stable reading is used as the basis for the water addition calculation. For example, a
0.1% deviation allows a 0.1% change in the water calculated.