id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
2958	Pump delta_head_init always negative	Christoph <buchner@…>	Francesco Casella	"Whenever I use a pump, I get such a warning:
{{{
Warning: Variable oil_pump.delta_head_init out of [min, max] interval: oil_pump.delta_head_init >= 0.0 has value: -0.00351929
}}}
I also see this with examples, e.g. Fluid.Examples.HeatingSystem.

I have dug into the code, and in /Modelica 3.2.1/Fluid/Machines.mo I find
{{{
final parameter SI.Height delta_head_init = flowCharacteristic(V_flow_single_init)-flowCharacteristic(0)
        ""Used for simplified initialization model"";
}}}

Now, if I don't misunderstand pump characteristics, the pump head is always decreasing with increasing volume flow, so doing the above calculation/initialization will _always_ result in a delta_head_init<0. 
This seems to me do be a sign error in the above code, am I correct?
"	defect	closed	high	Future	*unknown*	trunk	fixed