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
Select desired action for dry pump operation.
Option: Function:
[0] * OFF
[1] Warning The drive will continue to run, but activate a dry pump warning [W93]. A drive digital output or a
serial communication bus can communicate a warning to other equipment.
[2] Alarm The drive will stop running and activate a dry pump alarm [A93]. A drive digital output or a serial
communication bus can communicate an alarm to other equipment.
[3] Man. Reset Alarm The drive will stop running and activate a dry pump alarm [A93]. A drive digital output or a serial
communication bus can communicate an alarm to other equipment.
NOTE!
Low Power Detection
must be Enabled (par. 22-21
Low Power Detection
) and commissioned (using either parameter group 22-3*,
No
Flow Power Tuning
, or par. 22-20
Low Power Auto Set-up
) in order to use Dry Pump Detection.
NOTE!
Do not set par. 14-20
Reset Mode
, to [13] Infinite auto reset, when par. 22-26
Dry Pump Function
is set to [2] Alarm. Doing so will
cause the drive to continuously cycle between running and stopping when a dry pump condition is detected.
NOTE!
If the drive is equipped with a constant speed bypass with an automatic bypass function that starts the bypass if the drive experiences
a persistent alarm condition, be sure to disable the bypass’ automatic bypass function, if [2] Alarm or [3] Man. Reset Alarm is selected
as the dry pump function.
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 Warning or Alarm
22-30 No-Flow Power
Range: Function:
0.00 kW* [0.00 - 0.00 kW] Readout of calculated no-flow power at actual speed. If power drops to the display value, the ad-
justable frequency drive will consider the condition as a no-flow situation.
22-31 Power Correction Factor
Range: Function:
100 %* [1 - 400 %] Make corrections to the calculated power at par. 22-30
No-Flow Power
.
If No Flow is detected when it should not be detected, the setting should be decreased. However,
if No Flow is not detected when it should be detected, the setting should be increased to above
100%.
6 How to Program the Low Harmonic Drive
VLT AQUA Low Harmonic Drive Instruction
Manual
6-36
MG.20.T1.22 - VLT
®
is a registered Danfoss trademark
6
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