Danfoss VLT AQUA Drive FC 200 Programming Manual page 190

Parameter Description
29-04 Pipe Fill Rate
Range:
0.001
3 3
ProcessCtrlUnit
29-05 Filled Setpoint
Range:
0 ProcessCtrlUnit
29-06 No-Flow Disable Timer
Range:
0 s [0 - 3600 s]
*
3.24.3 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 defined as the time when the
adjustable frequency drive starts to derag to when the
deragging finishes. When a derag is started, the adjustable
frequency drive ramps first to a stop and then an Off Delay
expires before the first cycle begins.
3-164
Function:
[0.001 - Specifies the filling rate in
999999.999 units/second using the PI
*
ProcessCtrlUnit] controller. Filling rate units
are feedback units/second.
This function is used for
filling up vertical pipe
systems but will be active
when the filling time has
expired regardless until
the pipe fill setpoint set in
29-05 Filled Setpoint is
reached.
Function:
[-999999.999 - Specifies the filled
*
999999.999 setpoint at which the
ProcessCtrlUnit] pipe fill function will be
disabled and the PID
controller will take
control. This function can
be used both for
horizontal and vertical
pipe systems.
Function:
MG20O622 - VLT
®
VLT AQUA Drive Programming Guide
Speed
+/- Derag
Speed:
Par.: 29 -13
Par.: 29 -14
0 Hz / RPM
Figure 3.83 Derag Function
If a derag is triggered from a drive stopped state, the first
Off Delay is skipped. The deragging event may consist of
several cycles; one cycle consists of one pulse in the
reverse direction followed by one pulse in the forward
direction. Deragging is considered finished after the
specified number of cycles has completed. More specif-
ically, on the last pulse (it will always be forward) of the
last cycle, the derag is considered finished after the
Deragging Run Time expires (the adjustable frequency
drive will be running at Derag Speed). In between pulses,
the adjustable frequency drive output coasts for a
specified Off Delay time to let debris in the pump settle.
NOTICE!
Do not enable deragging if the pump cannot operate in
reverse direction.
There are three different notifications for an ongoing
deragging event:
•
•
•
®
is a registered Danfoss trademark
Derag
function
activated
Derag O Delay:
Par. 29 -15
Deragging Run Time : Par . 29-12
1 Cycle
Number of Cycles : Par . 29 -10
Status in the LCP: "Auto Remote Derag"
A bit in the Extended Status Word (Bit 23, 80
0000 hex)
A digital output can be configured to reflect the
active deragging status.