Danfoss VLT HVAC Drive FC 102 Programming Manual page 169

Parameter Descriptions
22-40 Minimum Run Time
Range: Function:
10 s [0 - 600 s] Set the desired minimum running time for
*
the motor after a start command (digital
input or bus) before entering sleep mode.
22-41 Minimum Sleep Time
Range: Function:
10 s [0 - 600 s] Set the desired minimum time for staying in
*
sleep mode. This setting overrides any wake-
up conditions.
22-42 Wake-up Speed [RPM]
Range: Function:
Size [ par. To be used if parameter 0-02 Motor Speed
related 4-11 - Unit has been set for [0] RPM (parameter
*
par. 4-13 not visible if [1] Hz is selected). Only to be
RPM] used if parameter 1-00 Configuration Mode is
set for open loop and an external controller
applies speed reference.
Set the reference speed at which the sleep
mode should be cancelled.
22-43 Wake-up Speed [Hz]
Range: Function:
Size [ par. To be used if parameter 0-02 Motor Speed
related 4-12 - Unit has been set for [1] Hz (parameter not
*
par. visible if [0] RPM is selected). Only to be
4-14 Hz] used if parameter 1-00 Configuration Mode is
set for [0] Open Loop and speed reference is
applied by an external controller controlling
the pressure.
Set the reference speed at which the sleep
mode should be cancelled.
22-44 Wake-up Ref./FB Difference
Range: Function:
10 [0 - Only to be used if parameter 1-00 Configuration
% 100 %] Mode is set for [3] Process Closed Loop and the
*
integrated PI controller is used for controlling
the pressure.
Set the pressure drop allowed in percentage of
setpoint for the pressure (P
the sleep mode.
22-45 Setpoint Boost
Range: Function:
0 [-100 Only to be used if parameter 1-00 Configuration
% - 100 Mode is set to [3] Closed Loop and the integrated
*
%] PI controller is used. In systems with, for example,
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.
MG11CE02
Programming Guide
22-45 Setpoint Boost
Range:
22-46 Maximum Boost Time
Range:
60
s
*
3.20.4 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 parameter 4-13 Motor Speed High Limit [RPM] or
parameter 4-14 Motor Speed High Limit [Hz].
If the feedback is 2.5% of the programmed value in
parameter 20-14 Maximum Reference/Feedb. (or numerical
value of parameter 20-13 Minimum Reference/Feedb.
whichever is highest) below the set point for the desired
pressure for a set time (parameter 22-51 End of Curve
Delay), and the pump is running with maximum speed set
in parameter 4-13 Motor Speed High Limit [RPM] or
parameter 4-14 Motor Speed High Limit [Hz], the function
selected in parameter 22-50 End of Curve Function takes
place.
It is possible to get a signal on 1 of the digital outputs by
selecting [192] End of Curve in parameter group 5-3* Digital
Outputs and/or parameter group 5-4* Relays. The signal is
present, when an end-of-Curve condition occurs and the
) before cancelling
set
selection in parameter 22-50 End of Curve Function, is
different from [0] Off. The end-of-curve function can only
be used when operating with the built-in PID controller
([3] Closed loop in parameter 1-00 Configuration Mode).
Danfoss A/S © 03/2015 All rights reserved.
Function:
Set the desired overpressure/temperature in
percentage of setpoint for the pressure (P
temperature before entering sleep mode.
If set to 5%, the boost pressure is P
negative values can be used, for example, cooling
tower control where a negative change is needed.
Function:
[0 - Only to be used if parameter 1-00 Configuration
600 s] Mode is set to [3] Process 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.
)/
set
3 3
*1.05. The
set
167