130BA258.10
t
1
p
(Pressure)
Time
Time
No/Low Flow
detected
p
System
P
Set
Sleep mode
activated
P
Ref
= P
Wake
(Frequency)
f
Ref
f
Ref /
f
Out
f
Ref
f
Out
f
Wake
f
Out
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.
Configuration possibilities, overview:
Internal PI Controller
(
: Closed loop)
External PI Controller or manual control
(
: 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
NOTE
Sleep Mode will not be active when Local Reference is
active (set speed manually by means of arrow buttons on
the LCP). See
.
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
has
been set for RPM (parameter not visible
if Hz selected). Only to be used if
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
, has
been set for Hz (parameter not visible if
RPM selected). Only to be used if
, 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.
Parameter Description
VLT
®
HVAC Drive Programming Guide
152
MG.11.CC.02 - VLT
®
is a registered Danfoss trademark
3
3
