NMC-PRO
INSTALLATION GUIDE
Doc.Name:NMC‐PRO׀InstallationManual Revision:2 Page:32
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HeatingNetwork–P&ITuningprocess
NMC Pro attempts to keep the greenhouse temperature close to the set point entered by the
user (Heating Program-Parameter # 1.3.4). To do this, the controller receives feedback from
the temperature sensors and continuously calculates and adjust the output (Open / Close
mixing valve). These calculations are based on the PI algorithm where:
P is the Proportional factor
I is the Integral factor
The P and I factor values range from 0-10.
While installing a heating system with an NMC Climate controller, calibrate the system to
achieve precise control on the Zone temperature.
The P factor determines the system reaction; a higher P lengthens the opening time /
closing time of the mixing valve, which causes faster changes in temperature (both
increases and decreases).
The I factor determines the deviation from the target temperature. It is actually the
accumulated error of the measured temperature from the desired temperature.
The combination of the P and I calibration enable superior system.
Calibrate the system:
when installing
when climate conditions change
Below is example of a system being calibrated after installation:
Enter the median P and I. P=5, I=1, and Dead band = 3.0 degrease (#1.3.10-11).
Monitor the results of the system for few hours (over night).
According to the results, adjusting the P & I factors:
o Increase or decrease the P and I depending on the overshooting.
Note: Wait until you have sufficient results before adjusting the parameters.
Note:
Whenadjustingtheparameters,raiseordecreasethelevelbyoneunitperdayonly.
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