Nastec MIDA 203 Installation And Use Manual
Also see for MIDA 203: Installation, use and maintenance handbook
                            | |
Contents
| 
74.2 MIDA Installation for constant pressure controlMIDA controls the pump speed to maintain constant pressure at a set point independent of the water demand in the system.A basic schematic is shown below:4.2.1 Pressure tankInstallation of a pressure tank in the hydraulic system is recommended to compensate leakage of water in the system (orduring minimum water demand) and to avoid continuous start/stop cycling of the pump (check the appendix for moreinformation). Selecting the proper volume and pre-charge pressure of the tank is very important; smaller tank volumes willnot compensate adequately for minimum water usage or leakage, while larger volumes make it more difficult for MIDA tocontrol the pressure evenly.Recommended tank volume is equal to the 10% of the maximum water flow of the system (expressed in volume unit/min)Example: if the max water flow is 50 liters/min, the pressure tank should have a capacity of 5 litersIf the max water flow is 20 gpm, the pressure tank should have a capacity of 2 gallonsPre-charge pressure of the pressure tank should be at least 80% than the set-pressure of the system.Example: if the set-pressure of the system is 4 bar, the pre-charge pressure of the tank should be 3.2 barIf the set-pressure of the system is 60 psi, the pre-charge pressure of the tank should be 48 psi4.2.2 Pressure sensorMIDA requires a pressure sensor with a linear output signal within the range 4 – 20 mA. The pressure transducer can bepowered by any range of DC Voltage which includes the value 15 V dc.MIDA accepts the signal of a second pressure sensor in order to: realize constant differential pressure (AN1 – AN2). substitute first pressure sensor when it failsSENSOR 1 AN1: 4-20 mA (-) signal +15V: 15 Vdc (+) power supplySENSOR 2 AN2: 4-20 mA (-) signal +15V: 15 Vdc (+) power supplyMIDA123541: pump2: check valve3: pressure tank4: valve5: valve6: pressure sensor6 |
manualsdatabase
Your AI-powered manual search engine