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 (par.
22-3*) for tuning of the No Flow function must be set to default.
Configuration possibilities, overview:
Internal PI Controller
(Par. 1-00: Closed loop)
External PI Controller or manual
control
(Par. 1-00: 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/Tempera-
ture (transmitter
connected)
Yes
No
Output frequency
No
Yes
NB!
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.
VLT
®
AQUA Drive Programming Guide
2. Parameter Description
MG.20.O2.02 - VLT
®
is a registered Danfoss trademark
203
2