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 con-
troller 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)/tem-
perature 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 controller
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.
2.19.5 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 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 par. 5-3*
Digital Outputs
and/or par. 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 operating 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
A warning is issued in the display [W94].
[2]
Alarm
An alarm is issued and the frequency converter trips. A message [A94] appears in the display.
[3]
Manual Reset Alarm
NB!
Automatic restart will reset the alarm and start the system again.
22-51 End of Curve Delay
Range:
Function:
10 s*
[0 - 600 s]
When an End of Curve condition is detected, a timer is activated. When the time set in this parameter
expires, and the End of Curve condition has been steady in the entire period, the function set in
par. 22-50
End of Curve Function
will be activated. If the condition disappears before the timer
expires, the timer will be reset.
2 Parameter Description
VLT
p
Automation VT Drive FC322
Programming Guide
220
MG.20.W1.22 - VLT
p
is a registered Danfoss trademark
2
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