Danfoss VLT HVAC Series, Programming Manual, Page: 223 / 338

22-23 No-Flow Function
Option: Function:
Common actions for low power detection and low speed detection (Individual selections not possi-
ble).
[0] * OFF
[1] Sleep Mode
[2] Warning Messages in the Local Control Panel display (if mounted) and/or signal via a relay or a digital output.
[3] Alarm The adjustable frequency drive trips and the motor stays stopped until reset.
22-24 No-Flow Delay
Range: Function:
10 s* [1 - 600 s] Set the time. Low Power/Low Speed must remain detected to activate signal for actions. If detection
disappears before the timer runs out, the timer will be reset.
22-26 Dry Pump Function
Option: Function:
Low Power Detection must be Enabled (par.22-21 Low Power Detection ) and commissioned (using
either par. 22-3*, No Flow Power Tuning , or par.22-20 Low Power Auto Set-up ) in order to use dry
pump detection.
[0] * OFF
[1] Warning Messages in the Local Control Panel display (if mounted) and/or signal via a relay or a digital output.
[2] Alarm The adjustable frequency drive trips and the motor stays stopped until reset.
22-27 Dry Pump Delay
Range: Function:
10 s* [0 - 600 s] Defines for how long the dry pump condition must be active before activating a warning or alarm.
3.20.2 22-3* No-Flow Power Tuning
Tuning Sequence, if not choosing
Auto Set-up
in par.22-20
Low Power Auto Set-up
:
1. Close the main valve to stop flow
2. Run with motor until the system has reached normal operating temperature
3. Press Hand On button on the LCP and adjust speed for approx. 85% of rated speed. Note the exact speed
4. Read the power consumption either by looking for the actual power in the data line in the LCP or call par.16-10
Power [kW]
or par.16-11
Power
[hp]
in the main menu. Note the power readout
5. Change the speed to approx. 50% of rated speed. Note the exact speed
6. Read the power consumption either by looking for the actual power in the data line in the LCP or call par.16-10 Power [kW] or par.16-11 Power
[hp]
in the main menu. Note the power readout
7. Program the speeds used in par.22-32 Low Speed [RPM] , par.22-33 Low Speed [Hz] , par.22-36 High Speed [RPM] and par.22-37 High Speed
[Hz]
8. Program the associated power values in par.22-34
Low Speed Power [kW]
, par.22-35
Low Speed Power [HP]
, par.22-38
High Speed Power
[kW]
and par.22-39
High Speed Power [HP]
9. Switch back by means of
Auto On
or
Off
VLT ® HVAC Drive Programming Guide 3 Parameter Description
MG.11.C6.22 - VLT ® is a registered Danfoss trademark
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