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I am getting a user notification that says "More than one VSPB cannotcontrol the same control node". I'm following all the rules for variablespeed pumps, what am I doing wrong?Problem ID#: 67011
It sounds like this model may be set up slightly incorrectly usingmultiple variable speed pump batteries (VSPB), which are different thanjust variable speed pumps.It's very likely that you meant to use regularpump set up as a VSP's instead of a VSPB. VSP's are setup using theregular pump element of which you will just set the properties of thiselement to variable speed pump. You do this by changing the "Is variablespeed pump?" field to 'True' and then setting up your pump. VSPB's arethe element that looks like a pump with a square around it. A VariableSpeed Pump Battery element represents multiple variable speed pumps thatmeet the following criteria:1) the VSPs are parallel with each other (not in-line)2) the VSPs are sharing common upstream (inflow) and downstream(outflow) nodes3) the VSPs are identical (have the same pump definition)4) the VSPs are controlled by the same target node and the same targethead.Parallel variable speed pumps (VSPs) are operated as one group and ledby a single VSP, the so-called lead VSP, while the other VSPs at thesame battery are referred as to as lag VSPs. A lag VSP turns on andoperates at the same speed as the lead VSP when the lead VSP is not ableto meet the target head and turns off when the lead VSP is able todeliver the target head or flow.From the standpoint of input data, Variable Speed Pump Batteries aretreated exactly the same as single pump elements that are defined asvariable speed pumps of the Fixed Head Type with one exception; numberof Lag Pumps must be defined in the Lag Pump Count field.If you still need more help please contact technical support.