10.12.6 PRESSURE LOSS COMPENSATION
When you pressurise a long pipe that has many outlets, the best position for the sensor is in
the middle of the pipe (the position 2 in the figure). You can also put the sensor directly after
the pump. This gives the right pressure directly after the pump, but farther in the pipe, the
pressure drops with the flow.
PT
PT
A
B
C
D
E
F
Fig. 42: The position of the pressure sensor
A. Pressure
B. No flow
C. With flow
D. Pipe length
E. Position 1
F. Position 2
P3.12.6.1 ENABLE SETPOINT 1 (ID1189)
Use this parameter to enable the pressure loss compensation in the pump system.
P3.12.6.2 SETPOINT 1 MAX COMPENSATION (ID 1190)
Use this parameter to set the maximum compensation for PID setpoint value that is applied
when the output frequency of the drive is at the maximum frequency.
The sensor is put in position 1. The pressure in the pipe stays constant when there is no flow.
But with flow, the pressure decreases farther in the pipe. To compensate for this, lift the
setpoint as the flow increases. Then the output frequency makes an estimate of the flow, and
the setpoint increases linearly with the flow.
PARAMETER DESCRIPTIONS
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