Operating instructions

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
(par. 1-00 Configuration Mode: Closed loop)
External PI Controller or manual control
(par. 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 (transmit-
ter 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 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:
Application
dependent
*
[Applica-
tion
dependant]
To be used if par. 0-02 Motor Speed Unit
has been set for RPM (parameter not
22-42 Wake-up Speed [RPM]
Range: Function:
visible if Hz selected). Only to be used if
par. 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.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CA.02 - VLT
®
is a registered Danfoss trademark 145
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