Technical information

When low power or low speed is detected the motor is
stopped, but the reference signal (f
ref
) from the external
controller is still monitored and because of the low
pressure created, the controller will increase the reference
signal to gain pressure. When the reference signal has
reached a set value f
wake
the motor restarts.
The speed is set manually by an external reference signal
(Remote Reference). The settings (parameter group 22-3*)
for tuning of the No Flow function must be set to default.
Internal PI Controller
(1-00 Configuration Mode: Closed loop)
External PI Controller or manual control
(1-00 Configuration Mode: Open loop)
Sleep mode Wake up Sleep mode Wake up
No Flow detection (pumps
only)
Yes Yes (except manual
setting of speed)
Low speed detection Yes Yes
External signal Yes Yes
Pressure/Temperature
(transmitter connected)
Yes No
Output frequency No Yes
Table 3.3 Configuration possibilities, overview
NOTE
Sleep Mode will not be active when Local Reference is
active (set speed manually by means of arrow buttons on
the LCP). See 3-13 Reference Site.
Does not work in Hand-mode. Auto set-up in open loop
must be carried out before setting input/output in closed
loop.
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 will override any wake up
conditions.
22-42 Wake-up Speed [RPM]
Range: Function:
Size
related*
[ par.
4-11 - par.
4-13 RPM]
To be used if 0-02 Motor Speed Unit has
been set for RPM (parameter not visible
if Hz selected). Only to be used if
1-00 Configuration Mode is set for Open
Loop and speed reference is applied by
an external controller.
Set the reference speed at which the
Sleep Mode should be cancelled.
22-43 Wake-up Speed [Hz]
Range: Function:
Size
related*
[ par.
4-12 - par.
4-14 Hz]
To be used if 0-02 Motor Speed Unit, has
been set for Hz (parameter not visible if
RPM selected). Only to be used if
1-00 Configuration Mode, is set for 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 - 100
%]
Only to be used if 1-00 Configuration Mode is
set for Closed Loop and the integrated PI
controller is used for controlling the pressure.
Set the pressure drop allowed in percentage
of set point for the pressure (Pset) before
cancelling the Sleep Mode.
NOTE
If used in application where the integrated PI controller is
set for inverse control (e.g. cooling tower applications) in
20-71 PID Performance, the value set in 22-44 Wake-up
Ref./FB Difference will automatically be added.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG11CD02 - VLT
®
is a registered Danfoss trademark 153
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