Siemens BT300 LonWorks, Operator'S Manual

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Chapter 4 - Parameters and Menu Structure
Parameters (M3)
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Siemens Industry, Inc.
Siemens BT300 HVAC Drive DPD01809
Building Technologies 2016-06-07
Pressure Loss Compensation
Figure 29: Position of Pressure Sensor.
If pressurizing a long pipe with many outlets, the best place for the sensor is probably halfway down the pipe
(Position 2). However, sensors may, for example, be placed directly after the pump. This will give the right
pressure directly after the pump, but farther down in the pipe the pressure will drop depending on the flow.
Enable Setpoint 1 (P3.12.6.1), and Setpoint 1 max compensation (P3.12.6.2)
The sensor is placed in Position 1. The pressure in the pipe will remain constant when we have no flow. However,
with flow, the pressure will drop farther down in the pipe. This can be compensated by raising the setpoint as the
flow increases. In this case, the flow is estimated by the output frequency and the setpoint is linearly increased with
the flow as in the figure below.