Commissioning the system: How to achieve, or configure a correct load- and unloading algorithm.
The Metacentre system uses an intern algorithm to determine when to load or un-load a compressor. An algorithm is a very complex mathematical calculation. Below you can find a list of items that influence the load/unload algorithm.
- The amount of compressors in the system.
- The size and type of each compressor, which is translated into the settings for each compressor in C03 - compressor configuration.
- High pressure (PH) and Low pressure (PL) setpoints.
- The rate of change measured in the pressure of the system. (increase or decrease)
Many of the above characteristics differ from installation to installation. It is often a process of trial and error to obtain a clean and steady load / un-load algorithm for your installation. Unfortunately it is impossible for us to give a predestined answer. However, below you can find some tips and guidelines on how to approach the whole.
- Locate the for your system relative Metacentre manual.
- Read chapter 3. Features and Functions. thoroughly.
- These pages explain the algorithm, PH, PL, tolerance and damping settings.
- You can find the Metacentre manuals here.
- Obtain the performance data for all connected compressors. E.g. the flow of each compressor is required to achieve a correct configuration of menu page C03.
- Review site specific installation and system characteristics.
Translate site documentation into the Metacentre system.
- Read chapter 5. Commissioning.
- When commissioning the Metacentre, carry out these procedures before attempting to start.
- Correctly Configuring menu C03 is very important to obtain a correct load- and unload algorithm. (The procedure is described in the manual, located roughly halfway.)
Site specific factors such as 'insufficient storage' or 'significant instantaneous changes in air consumption' will influence the Metacentre system controllers control strategy. To overcome the effects of site specific factors, adjustment of the Metacentre system controllers 'tolerance' and 'damping' values can be used. In extreme situations, it may be necessary to widen the Metacentre system controllers PL and PH parameters. For more information, consult the Metacentre Technical Manual.
Try to logically change the settable parameters to learn about how your system is behaving. Figure out a possible configuration that decently regulates both during the shift, and between the shifts.
- Reconsider PH and PL.
- Reconsider the tolerance.
- Reconsider the damping.
If you would like additional explanation or help, after considering the above information, feel free to contact the support team. In this case, please provide us with the up-to-date Metacentre commissioning sheets of your installation.