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22-46 Maximum Boost Time
Range:
Function:
60 s*
[0 - 600 s]
Only to be used if par.1-00
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* AP-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
or par.4-14
.
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
), and the pump is running with
max. speed set in par.4-13
, - the function selected in par.22-50
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
, 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
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!
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
will be activated. If the condition disappears before the timer
expires, the timer will be reset.
2.19.6 Broken Belt Detection, 22-6*
The Broken Belt Detection can be used in both closed and open loop systems for pumps and fans. If the estimated motor torque is below the broken belt
torque value (par. 22-61) and the frequency converter output frequency is above or equal to 15 Hz, the broken belt function (par. 22-60) is performed
22-60 Broken Belt Function
Option:
Function:
Selects the action to be performed if the Broken Belt condition is detected
[0] *
Off
[1]
Warning
[2]
Trip
2 Parameter Description
VLT
®
AQUA Drive Programming Guide
192
MG.20.O4.02 - VLT
®
is a registered Danfoss trademark
2