Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual page 89

How to programme the freque...
22-45 Setpoint Boost
Range: Function:
0 [-100 Only to be used if parameter 1-00 Configuration
% - 100 Mode, is set for [3] 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
extends the time in which the motor is stopped
and helps to avoid frequent start/stop.
Set the desired overpressure/temperature in
percentage of setpoint for the pressure (P
temperature before entering the sleep mode.
If setting for 5%, the boost pressure is P
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 [0 - Only to be used if parameter 1-00 Configuration
s 600 s] 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 is
allowed. If the set time is exceeded, sleep mode is
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 The frequency converter continues to run, but
activates an end-of-curve warning [W94]. A
frequency converter digital output or a serial
communication bus can communicate a
warning to other equipment.
[2] Trip The frequency converter stops running and
activates an end-of-curve alarm [A 94]. A
frequency converter digital output or a serial
communication bus can communicate an
alarm to other equipment.
[3] Manual The frequency converter stops running and
Reset Trip activates an end-of-curve alarm [A 94]. A
frequency converter digital output or a serial
communication bus can communicate an
alarm to other equipment.
[4] Stop and
Trip
NOTICE
Automatic restart resets the alarm and restarts the
system.
MG20Y202
Operating Instructions
NOTICE
Do not set 14-20 Reset Mode, to [13] Infinite auto reset,
when parameter 22-50 End of Curve Function is set to [2]
Alarm. Doing so causes the frequency converter to
continuously cycle between running and stopping when
an end-of-curve condition is detected.
NOTICE
If the frequency converter is equipped with a constant
speed bypass with an automatic bypass function that
)/
set
starts the bypass if the frequency converter experiences
a persistent alarm condition, be sure to disable the
*1.05.
set
bypass's automatic bypass function, if [2] Alarm or [3]
Man. Reset Alarm is selected as the end-of-curve
function.
22-51 End of Curve Delay
Range:
10 s
*
600 s]
22-80 Flow Compensation
Option:
[0] Disabled Setpoint compensation not active.
*
[1] Enabled Setpoint compensation is active. Enabling this
22-81 Square-linear Curve Approximation
Range:
100 %
*
NOTICE
Not visible when running in cascade.
Danfoss A/S © Rev. 06/2014 All rights reserved.
Function:
[0 - 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 parameter 22-50 End of Curve
Function is activated. If the condition disappears
before the timer expires, the timer is reset.
Function:
parameter allows the flow-compensated setpoint
operation.
Function:
[0 - 100 %] Example 1:
Adjustment of this parameter allows the
shape of the control curve to be adjusted.
0 = Linear
100% = Ideal shape (theoretical).
6 6
87