Main Menu - Water Application - Group - Danfoss VLT AQUA Programming Manual

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VLT AQUA Drive Programming Guide
26-63 Terminal X42/11 Output Bus Control
Range:
*
0.00
26-64 Terminal X42/11 Output Timeout Preset
Range:
0.00%
2.23. Main menu – Water application – Group 29
2.23.1. Water application, 29-**
The group contains parameters used for monitoring water / wastewater applications.
2.23.2. Pipe Fill function, 29-0*
In water supply systems water hammering can occur when filling the pipe too fast. It is therefore
desired to limit the filling rate. Pipe Fill Mode eliminates the occurrence of water hammering as-
sociated with the rapid exhausting of air from a piping system by filling the pipes at low rate.
The function is useable 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 sys-
tems requires a user specified speed to fill for a user specified time and / or until a user specified
pressure setpoint is reached.
The best way to fill a vertical pipe system is to use the PID 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 systems.
Illustration 2.4: Horizontal Pipe System
Function:
[0.00 - 100%] Holds the level of terminal X42/11 if controlled by bus.
Function:
* [0.00 - 100%] Holds the preset level of terminal X42/11.
In case of a bus timeout and a timeout function is selected in
par 26-70 the output will preset to this level.
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MG.20.O2.02 - VLT is a registered Danfoss trademark
2. Parameter Description
253
2