Parameters 29-** Water Application Functions - Danfoss VLT AQUA Drive FC 202 Programming Manual

Parameter Description
3.25 Parameters 29-** Water Application
Functions
The group contains parameters used for monitoring water/
wastewater applications.
3.25.1 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. As 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
setpoint 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 the above to
ensure a safe filling of any system.
No matter which system, the pipe fill mode starts using
the constant speed set in parameter 29-01 Pipe Fill Speed
[RPM] until the pipe fill time in parameter 29-03 Pipe Fill
Time has expired. Filling then continues with the filling
ramp set in parameter 29-04 Pipe Fill Rate until the filling
setpoint specified in parameter 29-05 Filled Setpoint is
reached.
Speed
Max. speed
Fill speed
Min. speed
Normal ramp
Initial ramp
Illustration 3.110 Horizontal Pipe System
MG20OB02
Programming Guide
Closed loop
Fill time or lled setpoint
Danfoss A/S © 05/2018 All rights reserved.
Speed
Max. speed
Min. speed
Fill rate unit/sec.
Initial ramp
Filled setpoint
Illustration 3.111 Vertical Pipe System
29-00 Pipe Fill Enable
Option: Function:
[0] Disabled Select [1] Enabled to fill pipes at a user-specified
*
rate.
[1] Enabled Select [1] Enabled to fill pipes at a user-specified
rate.
29-01 Pipe Fill Speed [RPM]
Range: Function:
Size [ par. Set the filling speed for filling horizontal
related 4-11 - pipe systems. The speed can be selected
*
par. 4-13 in Hz or RPM depending on the selection
RPM] made in parameter 4-11 Motor Speed Low
Limit [RPM]/parameter 4-13 Motor Speed
High Limit [RPM] or in
parameter 4-12 Motor Speed Low Limit [Hz]/
parameter 4-14 Motor Speed High Limit [Hz].
29-02 Pipe Fill Speed [Hz]
Range: Function:
Size [ par. Set the filling speed for filling horizontal
related 4-12 - pipe systems. The speed can be selected
*
par. 4-14 in Hz or RPM depending on the options
Hz] selected in parameter 4-11 Motor Speed
Low Limit [RPM]/parameter 4-13 Motor
Speed High Limit [RPM] or in
parameter 4-12 Motor Speed Low Limit [Hz]/
parameter 4-14 Motor Speed High Limit [Hz].
29-03 Pipe Fill Time
Range: Function:
0 s [0 - 3600 s] Set the specified time for pipe filling of
*
horizontal pipe systems.
Closed loop
Time
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