How to control incoming air-speed in the wind tunnel?
You may connect your wind tunnel’s ventilator to the Series 1580/1585’s main circuit, or the Series 1780 main board, in order to control the incoming airspeed.
To start, make sure that your fan has a speed control / regulator session and it may be controlled and regulated by a 50 Hz PWM signal. If so, you may then connect the control cable to the Servo port on your Series 1580/1585 main circuit or the Series 1780 Power and Control Console.
See guideline SITPWM - PWM troubleshooting guideline for more information.