Internal PI Controller
(
[3] Process Closed Loop
)
External PI Controller or manual control
(
[0] Speed 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 3.25 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 Local Control Panel). See Par. 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
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.
22-44 Wake-up Ref./FB Difference
Range:
Function:
10 %
*
[0 - 100
%]
Only to be used if
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 (P
set
) 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
, the value set in
will automatically be added.
22-45 Setpoint Boost
Range:
Function:
0
%
*
[-100
- 100
%]
Only to be used if
, is set
for 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 will
extend the time in which the motor is stopped
and help to avoid frequent start/stop.
Set the desired over pressure/temperature in
percentage of set point for the pressure (P
set
)/
temperature before entering the Sleep Mode.
If setting for 5%, the boost pressure will be
P
set
*1.05. 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 s
*
[0 -
600 s]
Only to be used if
is set
for Closed Loop and the integrated PI controller
is used for controlling the pressure.
Set the maximum time for which boost mode
will be allowed. If the set time is exceeded,
Sleep Mode will be entered, not waiting for the
set boost pressure to be reached.
Parameter Description
VLT
®
Refrigeration Drive Programming Guide
134
MG16H102 - VLT
®
is a registered Danfoss trademark
3
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