Operating instructions

22-43 Wake-up Speed [Hz]
Range: Function:
Application
depend-
ent
*
[Applica-
tion
dependant]
To be used if par. 0-02 Motor Speed Unit,
has been set for Hz (parameter not
visible if RPM selected). Only to be used
if par. 1-00 Configuration Mode, is set for
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 - 100
%]
Only to be used if par. 1-00 Configuration Mode
is set for 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 (Pset) before cancel-
ling the Sleep Mode.
NOTE
If used in application where the integrated PI controller
is set for inverse control (e.g. cooling tower applications)
in par. 20-71 PID Performance, the value set in
par. 22-44 Wake-up Ref./FB Difference will automatically
be added.
22-45 Setpoint Boost
Range: Function:
0
%
*
[-100 -
100 %]
Only to be used if par. 1-00 Configuration Mode, is
set for 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 will
extend 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 (Pset)/
temperature before entering the Sleep Mode.
If setting for 5%, the boost pressure will be
Pset*1.05. 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 s
*
[0 - 600
s]
Only to be used if par. 1-00 Configuration Mode is
set for Closed Loop and the integrated PI control-
ler is used for controlling the pressure.
Set the maximum time for which boost mode will
be allowed. If the set time is exceeded, Sleep
Mode will be entered, not waiting for the set boost
pressure to be reached.
3.20.4 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 par. 4-13 Motor
Speed High Limit [RPM] or par. 4-14 Motor Speed High Limit
[Hz].
In case the feed back is 2.5% of the programmed value in
par. 20-14 Maximum Reference/Feedb. (or numerical value of
par. 20-13 Minimum Reference/Feedb. whichever is highest)
below the set point for the desired pressure for a set time
(par. 22-51 End of Curve Delay), and the pump is running with
max. speed set in par. 4-13 Motor Speed High Limit [RPM] or
par. 4-14 Motor Speed High Limit [Hz], - the function selected in
par. 22-50 End of Curve Function will take 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 signal will be
present, when an End of Curve condition occurs and the
selection in par. 22-50 End of Curve Function, is different from
Off. The end of curve function can only be used when operat-
ing with the built-in PID controller (Closed loop in
par. 1-00 Configuration Mode).
22-50 End of Curve Function
Option: Function:
[0]
*
Off End of Curve monitoring not active.
[1] Warning The drive will continue to run, but activate a
End of Curve warning [W94]. A drive digital
output or a serial communication bus can
communicate a warning to other equipment.
[2] Alarm The drive will stop running and activate a End
of Curve alarm [A 94]. A drive digital output or a
serial communication bus can communicate an
alarm to other equipment.
[3] Man. Reset
Alarm
The drive will stop running and activate a End
of Curve alarm [A 94]. A drive digital output or a
serial communication bus can communicate an
alarm to other equipment.
Parameter Description
VLT
®
HVAC Drive Programming Guide
146 MG.11.CA.02 - VLT
®
is a registered Danfoss trademark
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