Danfoss VLT AQUA Drive Operating Instructions Manual page 91

®
VLT AQUA Drive
Operating Instructions
22-45 Set Point Boost
Range:
*
0% [-100% - +100%]
22-46 Maximum Boost Time
Range:
*
60 sec. [0-600 sec.]
22-50 End of Curve Function
Option:
* Off
[0]
[1] Warning
[2] Alarm
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:
*
10 s [0 to 600 s]
22-80 Flow Compensation
Option:
* Disabled
[0]
[1] Enabled
22-81 Square-Linear Curve Approximation
Range:
*
100% [ 0 – 100%]
Function:
Configuration Mode
Only to be used if par. 1-00,
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.
Function:
Only to be used if par. 1-00, Configuration Mode
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.
Function:
End of Curve monitoring not active.
A warning is issued in the display [W94].
An alarm is issued and the frequency converter trips. A message [A94] appears in the display.
Function:
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
Function
, will be activated. If the condition disappears before the timer expires, the timer will be reset.
Function:
[0] Disabled : Set-Point compensation not active.
Enabled
[1] :Set-Point compensation is active. Enabling this parameter allows Flow Compensated Setpoint op-
eration.
Function:
Example 1:
Adjustment of this parameter allows the shape of the control curve to be adjusted.
0 = Linear
100% = Ideal shape (theoretical).
®
MG.20.M4.02 - VLT is a registered Danfoss trademark
8. How to programme the frequency converter
, is set for Closed Loop and the integrated PI controller is used.
, is set for Closed Loop and the integrated PI controller is used
8
par. 22-50, End of Curve
91