Trane TR170 - Page 88

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
conguration in parameter 1-00 Conguration Mode.
Conguration 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.
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]
3.15.3 22-3* No-ow Power Tuning
Tuning sequence:
1. To stop ow, close the main valve.
2. Run with motor until the system has reached
normal operating temperature.
3. Press [Hand On] key on the LCP and adjust speed
for approximately 85% of the rated speed. Note
the exact speed.
4. Read power consumption either by looking for
actual power in the data line in the LCP or call
parameter 16-10 Power [kW] in the Main Menu.
Note the power readout.
Parameters Programming Guide
BAS-SVP16B-EN 02/2017 All rights reserved. 87
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