Danfoss VLT Flow Drive FC 111 Programming Manual page 167

VLT® Flow Drive FC 111
Programming Guide
This coherence is based on the adjustment of 2 sets of speed and associated power at no-flow. Monitoring power enables detection
of no-flow conditions in systems with fluctuating suction pressure, or of the pump having a flat characteristic towards low speed.
The 2 sets of data must be based on measurement of power at approximately 50% and 85% of maximum speed with the valves
closed. The data is programmed in parameter group 22-3* No-Flow Power Tuning.
Enable and commission no-flow detection in parameter 22-23 No-Flow Function and parameter group 22-3* No-Flow Power Tuning.
22-23 No-Flow Function
Default value: [0] Off
Conversion index: -
Select desired action if no flow or minimum speed detected.
Table 385: Option:
[0]
[1]
[2]
[3]
22-24 No-Flow Delay
Default value: 10 s
Conversion index: 0
Set delay before action set in parameter 22-23 No-Flow Function takes place if a no-flow condition is detected.
Table 386: Range:
Min: 1 s
Dry-pump detection
If the pump has run dry (low power consumption-high speed), no-flow detection can also be used for detecting with both the inte-
grated PI controller and an external PI controller.
The 2 conditions for dry-pump signal are as follows:
• Power consumption below no-flow level.
• Pump running at maximum speed or maximum reference open loop, whichever is lowest.
The signal must be active for a set time (parameter 22-27 Dry Pump Delay) before the selected action takes place. Possible actions
can be selected from parameter 22-26 Dry Pump Function.
22-26 Dry Pump Function
Default value: [0] Off
Conversion index: -
Select desired action for dry pump operation.
-
For drives with constant speed bypass, if an automatic bypass function starts the bypass at persistent alarm conditions, disa-
ble the automatic bypass function when [2] Alarm or [3] Man. Reset Alarm is selected for the dry pump function.
Danfoss A/S © 2021.07
Parameter type: Option
Data type: u_int8
Off
Sleep mode
Warning
Alarm
Parameter type: Range
Data type: u_int16
Max: 600 s
Parameter type: Option
Data type: u_int8
N O T I C E
2-setup: All setups
Change during operation: True
2-setup: All setups
Change during operation: True
Default value: 10 s
2-setup: All setups
Change during operation: True
AU363928304090en-000101 / 130R0982 | 167
Parameters