20
ACCESSORIES - CONSTANT FLOW (MOTORS AC)
The constant flow accessory allows the flow to be maintained regardless of the change in the system pressure
drop.
The flow control is performed using a ratio of the flow of air to the pressure differential as shown in the image
below for three-phase fans (Image 21).
-Three-phase Motors AC:
The system uses a differential pressure sensor and a variable-frequency drive (fans with three-phase motor). The
differential pressure sensor has different operating ranges, the chosen range (image 22) depending on the setting
to be made.
A - Differential Pressure Sensor
B - Variable-frequency Drive
C - Fan
Image 21
Range of differential
sensor values SPS
Image 22
Note:
Factory pre-set
Summary of Contents for TTP
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