Danfoss VLT AQUA Drive FC 202 Programming Manual page 159

Parameter Description
22-43 Wake-up Speed [Hz]
Range: Function:
Size [ 0 - To be used if parameter 0-02 Motor Speed
related par. Unit, has been set for Hz (parameter not
*
4-14 visible if RPM selected). Only to be used if
Hz] parameter 1-00 Configuration Mode, is set for
[0] Open Loop and speed reference is applied
by an external controller controlling the
pressure.
Set the reference speed at which the sleep
mode should be cancelled.
22-44 Wake-up Ref./FB Difference
Range: Function:
10 [0 - Only to be used if parameter 1-00 Configuration
% 100 %] Mode, is set for [3] Closed Loop and the
*
integrated PI controller is used for controlling the
pressure.
Set the pressure drop allowed in percentage of
set point for the pressure (P
the sleep mode.
NOTICE
If used in application where the
integrated PI controller is set for inverse
control in parameter 20-71 PID
Performance, the value set in 22-44 Wake-
up Ref./FB Difference will automatically be
added.
22-45 Setpoint Boost
Range: Function:
0 [-100 Only to be used if parameter 1-00 Configuration
% - 100 Mode, is set for [3] Closed Loop and the integrated
*
%] PI controller is used. In systems with e.g. constant
pressure control, it is advantageous to increase the
system pressure before the motor is stopped. This
extends the time in which the motor is stopped
and help to avoid frequent start/stop.
Set the desired over pressure/temperature in
percentage of set point for the pressure (P
temperature before entering the sleep mode.
If setting for 5%, the boost pressure is P
The negative values can be used for e.g. cooling
tower control where a negative change is needed.
22-46 Maximum Boost Time
Range: Function:
60 [0 - Only to be used if parameter 1-00 Configuration
s 600 s] Mode is set for Closed Loop and the integrated PI
*
controller is used for controlling the pressure.
Set the maximum time for which boost mode is
allowed. If the set time is exceeded, Sleep Mode
is entered, not waiting for the set boost pressure
to be reached.
MG20O702
Programming Guide
3.19.5 22-5* End of Curve
The end of curve conditions occur when a pump is
yielding a too large volume to ensure the set pressure.
This can occur if there is a leakage in the distribution pipe
system after the pump causing the pump to operate at the
end of the pump characteristic, valid for the max. speed
set in parameter 4-13 Motor Speed High Limit [RPM] or
parameter 4-14 Motor Speed High Limit [Hz].
In case the feed back is 2.5% of the programmed value in
parameter 3-03 Maximum Reference below the set point for
the desired pressure for a set time (parameter 22-51 End of
Curve Delay), and the pump is running with max. speed set
in parameter 4-13 Motor Speed High Limit [RPM] or
parameter 4-14 Motor Speed High Limit [Hz], - the function
selected in parameter 22-50 End of Curve Function takes
place.
It is possible to get a signal on one of the digital outputs
by selecting End of Curve [192] in parameter group 5-3*
Digital Outputs and/or parameter group 5-4* Relays. The
) before cancelling
signal is present, when an end of curve condition occurs
set
and the selection in parameter 22-50 End of Curve Function,
is different from Off. The end of curve function can only be
used when operating with the built-in PID controller ([3]
Closed Loop in parameter 1-00 Configuration Mode).
22-50 End of Curve Function
Option:
[0] Off
[1] Warning
[2] Alarm
[3] Manual
)/
set
*1.05.
set
NOTICE
Automatic restart resets the alarm and restarts the
system.
NOTICE
Do not set 14-20 Reset Mode, to [13] Infinite auto reset,
when parameter 22-50 End of Curve Function is set to [2]
Alarm. Doing so causes the frequency converter to
continuously cycle between running and stopping when
an end-of-curve condition is detected.
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
Function:
End-of-curve monitoring not active.
The frequency converter continues to run, but
activates an end-of-curve warning [W94]. A
frequency converter digital output or a serial
communication bus can communicate a warning
to other equipment.
The frequency converter stops running and
activates an end-of-curve alarm [A 94]. A
frequency converter digital output or a serial
communication bus can communicate an alarm
to other equipment.
The frequency converter stops running and
Reset activates an end-of-curve alarm [A 94]. A
Alarm frequency converter digital output or a serial
communication bus can communicate an alarm
to other equipment.
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