No-ow detection
This function is used for detecting a no-ow situation in pump systems where all valves can be closed. Can be used both
when controlled by the integrated PI controller in the frequency converter or an external PI controller. Program the actual
conguration in parameter 1-00 Conguration Mode.
Conguration mode for
•
Integrated PI controller: Closed loop.
•
External PI controller: Open loop.
NOTICE
Carry out no-ow tuning before setting the PI controller parameters.
Table 3.11 No-ow Detection
No-ow detection is based on the measurement of speed and power. For a certain speed, the frequency converter calculates
the power at no-ow.
This coherence is based on the adjustment of 2 sets of speed and associated power at no-ow. Monitoring power enables
detection of no-ow conditions in systems with uctuating suction pressure, or of the pump having a at 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-ow detection in parameter 22-23 No-Flow Function and parameter group 22-3* No-Flow Power
Tuning.
22-23 No-Flow Function
Option: Function:
[0] * O
[1] Sleep Mode
[2] Warning
[3] Alarm
22-24 No-Flow Delay
Range: Function:
10 s* [1 - 600 s]
Parameters Programming Guide
MG18B502 Danfoss A/S © 04/2018 All rights reserved. 89
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