22-41 Minimum Sleep Time
Range:
Function:
30 s
*
[0 - 600 s] Set the minimum time for staying in sleep
mode. This setting overrides any wake-up
conditions.
22-42 Wake-up Speed [RPM]
Range:
Function:
Size
related
*
[ 0 -
par.
4-13
RPM]
To be used if
has been set for
[0] RPM
(parameter
not visible if
[1] Hz
is selected). Only to be
used if
parameter 1-00 Configuration Mode
is
set for
[0] Open loop
and an external
controller applies speed reference.
Set the reference speed at which the sleep
mode should be canceled.
22-43 Wake-up Speed [Hz]
Range:
Function:
Size
related
*
[ 0 -
par.
4-14
Hz]
To be used if
has been set for
[1] Hz
(parameter not
visible if
[0] RPM
is selected). Only to be 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 canceled.
22-44 Wake-up Ref./FB Difference
Range:
Function:
10
%
*
[0 -
100 %]
Only to be used if
is set to
[3] 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
set
) before canceling
the sleep mode.
NOTICE
If used in applications where the integrated
PI controller is set for inverse control in
parameter 20-71 Controller Performance
, the
value set in
parameter 22-44 Wake-up
Ref./FB Difference
is automatically added.
22-45 Setpoint Boost
Range:
Function:
0 %
*
[-100
-
100 %]
Only to be used if
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.
22-45 Setpoint Boost
Range:
Function:
Set the overpressure/overtemperature in
percentage of setpoint for the pressure (P
set
)/
temperature before entering sleep mode.
If set to 5%, the boost pressure is P
set
x1.05. The
negative values can be used, for example, in
cooling tower control where a negative change is
needed.
22-46 Maximum Boost Time
Range:
Function:
60
s
*
[0 -
600 s]
Only to be used if
is set to
[3] 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.
3.19.5 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.
The frequency converter initiates the function selected in
parameter 22-50 End of Curve Function
in the following
conditions:
•
The frequency converter is running at maximum
speed (
parameter 4-13 Motor Speed High Limit
or
parameter 4-14 Motor Speed High Limit
).
•
The feedback signal is less than the pressure
setpoint by a value that is equal to or exceeds
2.5% of the value in
•
The conditions are active for a time set in
parameter 22-51 End of Curve Delay
It is possible to obtain 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 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
Parameter Description
Programming Guide
MG20OB02
Danfoss A/S © 05/2018 All rights reserved.
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