10.12.6 PRESSURE LOSS COMPENSATIONWhen you pressurise a long pipe that has many outlets, the best position for the sensor is inthe middle of the pipe (the position 2 in the figure). You can also put the sensor directly afterthe pump. This gives the right pressure directly after the pump, but farther in the pipe, thepressure drops with the flow.PT PTABCDE FFig. 42: The position of the pressure sensorA. PressureB. No flowC. With flowD. Pipe lengthE. Position 1F. Position 2P3.12.6.1 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 appliedwhen 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 thesetpoint as the flow increases. Then the output frequency makes an estimate of the flow, andthe setpoint increases linearly with the flow.PARAMETER DESCRIPTIONS VACON · 17324-HOUR SUPPORT +358 (0)201 212 575 · EMAIL: VACON@VACON.COM 10
