In Wanda 3.60, the pump only listens to the control system when the property drive type is set to "Running" or "MotorFreq". This will be fixed in Wanda 3.70 where the pump can be used with a control system regardless of the drive-type setting (except for the "Level On/Off"-setting, which is a control system in itself).

The PUMP component can only receive a logical control input when the drive-type property is set to trip. With drive-type=motorfreq the component expects a numerical input signal specifying the relative frequency. This means that the input can vary between 0 and 1.

Entering an incorrect (too low) Young's modulus into the pipe properties can cause the number of pipe elements to exceed the maximum number of pipe elements (this limit depends on your license). Wanda will not allow you to run any computations when this happens.
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Above is the equation for the wave speed in the pipeline, where E is the Youngs modulus of the pipe. If the Youngs modulus is too low, the resulting wave speed c will be small. The number of elements n is calculated by the following equation:
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Where L is the length of the pipeline, c is the wave speed and Δt is the time step. if the wave speed is low, the number of pipe elements rises.