Danfoss VLT AQUA Drive FC 202 Programming Guide

29-04 Pipe Fill Rate
Range: Function:
0.001
ProcessCtrlUnit*
[0.001 -
999999.999
ProcessCtrlUnit]
Species the ll rate in units
using the PI controller. Fill
rate units are feedback units.
This function is used for
lling up vertical pipe
systems, but is active when
the lling time has expired,
until the pipe ll setpoint set
in parameter 29-05 Filled
Setpoint is reached.
29-05 Filled Setpoint
Range: Function:
0
ProcessCtrlUnit*
[-999999.999 -
999999.999
ProcessCtrlUnit]
Species the lled
setpoint at which the pipe
ll function is disabled
and the PID controller
takes control. This
function can be used both
for horizontal and vertical
pipe systems.
29-06 No-Flow Disable Timer
Range: Function:
0 s* [0 - 3600 s]
29-07 Filled setpoint delay
Range: Function:
0 s* [0 - 10 s] Select the delay before the frequency converter
considers the lled setpoint to be reached if a
ll rate in units per second is used.
3.25.2 29-1* Deragging Function
The purpose of the deragging feature is to free the pump
blade of debris in waste water applications so that the
pump operates normally.
A deragging event is dened as the time when the
frequency converter starts to derag to when the deragging
nishes. When a derag is started, the frequency converter
ramps rst to a stop and then an o delay expires before
the rst cycle begins.
0 Hz/RPM
Derag off delay:
Par. 29 -15
+/- Derag
speed:
Par.: 29 -13
Par.: 29 -14
Deragging run-time : Par . 29-12
Speed
Derag
function
activated
1 Cycle
Number of cycles : Par . 29 -10
e30bc369.11
Illustration 3.112 Derag Function
If a derag is triggered from a frequency converter-stopped
state, the rst o delay is skipped. The deragging event
may consist of several cycles: one cycle consisting of 1
pulse in the reverse direction followed by 1 pulse in the
forward direction. Deragging is considered nished after
the specied number of cycles have completed. More
specically, on the last pulse (it is always forward) of the
last cycle, the derag is considered nished after the
deragging run-time expires (the frequency converter is
running at derag speed). In between pulses, the frequency
converter output coasts for a specied o-delay time to let
debris in the pump settle.
NOTICE
Do not enable deragging if the pump cannot operate in
reverse direction.
There are 3 dierent notications for an ongoing
deragging event:
•
Status in the LCP: Auto Remote Derag.
•
A bit in the extended status word (bit 23, 80 0000
hex).
•
A digital output can be congured to reect the
active deragging status.
Depending on the application and the purpose of using it,
this feature can be used as a preventive or reactive
measure and can be triggered/started in the following
ways:
Parameter Description
VLT
®
AQUA Drive FC 202
236 Danfoss A/S © 05/2018 All rights reserved. MG20OB02
33

Danfoss VLT AQUA Drive FC 202 Specifications

General

Brand	Danfoss
Model	VLT AQUA Drive FC 202
Category	DC Drives
Language	English