The MultiSmart Pump Station Manager has the option of an innovative VFD algorithm. This VFD module makes it very easy to set-up a VFD station. The standard application uses one 4-20 mA control loop through each drive. The MultiSmart algorithm then provides a smooth power curve as levels are increased and decreased regardless of how many pumps come online.
For example, the lead (duty) pump starts at 50% and, at the level where it is running at 100%, the lag (standby) pump starts. Many applications would start the lag pump at 50% and keep the lead pump at 100%. What the MultiSmart VFD algorithm does is start the lag pump and bring the speed of both to 75%. All of these parameters are user adjustable!
Therefore, multiple pumps will always be running at the same speed, and the speed will be adjusted depending on how many pumps are running.
Setup of this module is simple, with only the following values needed for each pump:
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Start speed %
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Level at 100% speed
Some additional features help to optimize the station:
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Manual (hand) speed (e.g. to ensure that pumps run at full speed for manual/hand mode)
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Fixed speed value and duration if required (e.g. to clear pipes by running pumps at 100% for 10 seconds initially).
