22-45 Set Point 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 sec.
*
[0-600 sec.]
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.
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.
NB!
Important: If using the cascade controller, the fixed speed pumps are not affected by the End of Curve function and will keep running.
22-51 End of Curve Delay
Range: Function:
10 s
*
[0 to 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.
22-80 Flow Compensation
Option: Function:
[0]
*
Disabled [0]
Disabled
: Set-Point compensation not active.
[1] Enabled [1]
Enabled
:Set-Point compensation is active. Enabling this parameter allows Flow Compensated Setpoint op-
eration.
22-81 Square-Linear Curve Approximation
Range: Function:
Example 1:
Adjustment of this parameter allows the shape of the control curve to be adjusted.
0 = Linear
100% = Ideal shape (theoretical).
100%
*
[ 0 – 100%]
VLT
®
AQUA Drive
Operating Instructions
8. How to programme the frequency converter
MG.20.M4.02 - VLT
®
is a registered Danfoss trademark
91
8
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