NMC-64 Irrigation
EC/pH correction adjustment
In order to set your system for optimal dosage the NMC-64 incorporates an advance
PID algorithm that is suited specifically for that purpose.
Set your dosage as follows:
• Set a runtime program with sufficient time, 30 minutes or so (
1.2 WATER RUN
TIME).
• Manually start a valve associated with the above set runtime program, no need to
attach a dosing program (
2.3 START/STOP VALVE).
To prevent damage during system tune up make sure you choose a valve
that is not irrigating an active crop section.
• Manually open one of the fertilizer channels through table 5.1 TEST > RELAYS
and measure the time until the NMC-64 recognizes the change (the EC should
start going up). Make the same test for an acid channel.
• Manually stop the open valve.
• Choose the longest time of the two, add about 15% to it and set it as the control
cycle (table 7.7 DOSING CONFIGURATION).
• Put the coarse and fine-tuning to 1 (table 7.7 DOSING CONFIGURATION).
• Set a dosing program with reasonable settings (table
1.3 DOSING PROGRM).
• Start the valve again, this time with the above set dosing program.
• While the system is fertigating and after verifying that there are no large
irregularities between set and actual flow start increasing the coarse tuning value
until the system gets to an accuracy of about 0.3 to 0.4 to each direction. Than
start increasing the fine-tuning until reaching the best possible accuracy.
• After reaching a good accuracy stop the valve and start it again with fresh water
only for a few minutes, until the system is flushed.
• Start the valve again, this time with the same dosing program you used before and
check how long it takes the system to stabilize. If it takes it a long time try slightly
increasing the coarse and fine-tuning.
Make sure you don’t set the coarse and fine tuning to strong as this will
result in an unstable injection (overshoots and down shoots).
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