Danfoss VLT FC 100 Series Programming Manual page 164

Parameter Description
known. In the example with a boost system, desired
pressure Pset is not known. 1-00 Configuration Mode must
be set for Open-loop.
Example: Boost system.
Figure 3.53
No-Flow detection (pumps
only)
Low speed detection
External signal
Pressure/Temperature
(transmitter connected)
Output frequency
Table 3.29 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 LCP). See 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:
10 s [0 - 600 s]
*
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.
®
VLT HVAC Drive Programming Guide
Internal PI Controller
(1-00 Configuration Mode: Closed-loop)
Sleep mode Wake up
Yes
Yes
Yes
Yes
No
Function:
MG11CD22 - VLT ® is a registered Danfoss trademark
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 will increase the reference
signal to gain pressure. When the reference signal has
reached a set value f , the motor restarts,.
wake
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.
External PI Controller or manual control
(1-00 Configuration Mode: Open-loop)
Sleep mode
Yes (except manual
setting of speed)
Yes
Yes
22-42 Wake-up Speed [RPM]
Range: Function:
Size [ par. To be used if 0-02 Motor Speed Unit has
related 4-11 - par. been set for RPM (parameter not visible
*
4-13 RPM] if Hz selected). Only to be used if
1-00 Configuration Mode is set for open-
loop and speed reference is applied by
an external controller.
Set the reference speed at which sleep
mode should be canceled.
22-43 Wake-up Speed [Hz]
Range: Function:
Size [ par. To be used if 0-02 Motor Speed Unit has
related 4-12 - par. been set for Hz (parameter not visible if
*
4-14 Hz] RPM selected). Only to be used if
1-00 Configuration Mode is set for open-
loop and speed reference is applied by
an external controller controlling the
pressure.
Set the reference speed at which sleep
mode should be canceled.
) from the external
ref
Wake up
No
Yes
3-137
3 3