2.22 Main menu – Water application – Group 29
2.23.1 29-** Water Application Functions
The group contains parameters used for monitoring water / wastewater applications.
2.23.2 29-0* Pipe Fill function
In water supply systems water hammering can occur when filling the pipes too fast. It is therefore desirable to limit the filling rate. Pipe Fill Mode eliminates
the occurrence of water hammering associated with the rapid exhausting of air from the piping system by filling the pipes at a low rate.
This function is used in horizontal, vertical and mixed piping systems. Due to the fact that the pressure in horizontal pipe systems does not climb as the
system fills, filling horizontal pipe systems requires a user specified speed to fill, for a user specified time and/or until a user specified pressure set-point
is reached.
The best way to fill a vertical pipe system is to use the PID function to ramp the pressure at a user specified rate between the motor speed low limit and
a user specified pressure.
The Pipe Fill function uses a combination of above to ensure a safe filling in any system.
No matter which system - the pipe fill-mode will start using the constant speed set in par. 29-01 until the pipe fill-time in par. 29-03 has expired, thereafter
filling will continue with the filling ramp set in par. 29-04 until the filling set-point specified in par. 29-05 is reached.
Illustration 2.9: Horizontal Pipe System
Illustration 2.10: Vertical Pipe System
2 Parameter Description
VLT
p
Automation VT Drive FC322
Programming Guide
264
MG.20.W1.22 - VLT
p
is a registered Danfoss trademark
2
Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com
http://www.remotesiteproducts.com/p-20772-Danfoss-131X8135-VLT-Automation-VT-Drive-VFD-FC322-230V-5-HP.aspx