Parameters 29-** Water Application Functions - Danfoss VLT AQUA Drive FC 200 Programming Manual

Parameter Description
3.24 Parameters 29-** Water Application
Functions
3.24.1 29-** Water Application Functions
The group contains parameters used for monitoring water/
wastewater applications.
3.24.2 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 29-01 Pipe Fill Speed [RPM]
until the pipe fill-time in 29-03 Pipe Fill Time has expired,
thereafter filling will continue with the filling ramp set in
29-04 Pipe Fill Rate until the filling set-point specified in
29-05 Filled Setpoint is reached.
Speed
Max. speed
Fill speed
Min. speed
Normal ramp
Initial ramp
Illustration 3.81 Horizontal Pipe System
®
VLT AQUA Drive Programming Guide
Closed loop
Fill time or lled setpoint
®
MG20O602 - VLT is a registered Danfoss trademark
Speed
Max. speed
Min. speed
Fill rate unit/sec.
Initial ramp
Filled setpoint
Illustration 3.82 Vertical Pipe System
29-00 Pipe Fill Enable
Option: Function:
[0] Disabled Select Enabled to fill pipes at a user specified
*
rate.
[1] Enabled Select Enabled to fill pipes with a user specified
rate.
29-01 Pipe Fill Speed [RPM]
Range: Function:
Size [ par. 4-11 Set the filling speed for filling
related - par. 4-13 horizontal pipe systems. The speed can
*
RPM] be selected in Hz or RPM depending
on the choices made in 4-11 Motor
Speed Low Limit [RPM]/4-13 Motor
Speed High Limit [RPM] or in 4-12 Motor
Speed Low Limit [Hz]/4-14 Motor Speed
High Limit [Hz].
29-02 Pipe Fill Speed [Hz]
Range: Function:
Size [ par. 4-12 Set the filling speed for filling
related - par. 4-14 horizontal pipe systems. The speed can
*
Hz] be selected in Hz or RPM depending
on the choices made in 4-11 Motor
Speed Low Limit [RPM]/4-13 Motor Speed
High Limit [RPM] or in 4-12 Motor Speed
Low Limit [Hz]/4-14 Motor Speed High
Limit [Hz].
29-03 Pipe Fill Time
Range: Function:
0.00 s [0.00 - 3600.00 s] Set the specified time for pipe filling
*
of horizontal pipe systems.
29-04 Pipe Fill Rate
Range:
0.001 [0.001 -
ProcessCtrlUnit 999999.999
*
ProcessCtrlUnit]
Closed loop
Time
Function:
Specifies the filling rate in
units/second using the PI
controller. Filling rate units
are feedback units/second.
This function is used for
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