Danfoss VLT AQUA Drive FC 202 Programming Manual page 158

Parameter Description
conditions cannot be based on feedback from the
pressure/temperature transducer as the setpoint is not
known. In the example with a boost system, desired
pressure P is not known. Parameter 1-00 Configuration
set
Mode, must be set for Open Loop.
Example: Boost system.
3 3
p
(Pressure)
P
Set
f f
(Frequency)
Ref Out
f
Wake
No/Low Flow
detected
Illustration 3.60 Boost System without Pressure Feedback
No Flow detection (pumps
only)
Low speed detection
External signal
Pressure/Temperature
(transmitter connected)
Output frequency
Table 3.21 Configuration Possibilities, Overview
NOTICE
Sleep mode is not active when local reference is active
(set speed manually with the navigation keys on the
LCP). See parameter 3-13 Reference Site.
Does not work in Hand mode. Carry out auto set-up in
open loop before setting input/output in closed loop.
22-40 Minimum Run Time
Range:
60 s [0 - 600 s] Set the desired minimum running time for
*
156
p
System
f f
Ref / Out
f
Ref
t f
1
Out
Sleep mode
activated
P = P
Ref
Internal PI Controller
(Parameter 1-00 Configuration Mode)
Sleep mode
Yes
Yes
Yes
Function:
the motor after a start command (digital
input or Bus) before entering sleep mode.
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
Programming Guide
When low power or low speed is detected, the motor is
stopped, but the reference signal (f
controller is still monitored and because of the low
pressure created, the controller increases the reference
signal to gain pressure. When the reference signal has
reached a set value f
The speed is set manually by an external reference signal
(Remote Reference). The settings (parameter group 22-3*
No-Flow Power Tuning) for tuning of the no-flow function
must be set to default.
Time
Time
Wake
Wake up
Yes
No
22-41 Minimum Sleep Time
Range:
30 s
*
22-42 Wake-up Speed [RPM]
Range:
Size
related
*
) from the external
ref
, the motor restarts.
wake
External PI Controller or manual control
(Parameter 1-00 Configuration Mode)
Sleep mode Wake up
Yes (except manual
setting of speed)
Yes
Yes
No
Yes
Function:
[0 - 600 s] Set the desired minimum time for staying in
sleep mode. This overrides any wake up
conditions.
Function:
[ 0 - To be used if parameter 0-02 Motor Speed
par. Unit has been set for RPM (parameter not
4-13 visible if Hz selected). Only to be used if
RPM] parameter 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.
MG20O702