+1 on the deadband, there is a parameter for that. Also, think about failure mode. If the pressure sensor fails, and thr drive sees 0mA on the input, do you want the VFD to go full speed or to stop? If you want it to stop, you may want to invert the control action, and also invert the pressure transmitter signal (many IFMs can do that). Otherwise there is a parameter in the drive to disable itself if the analog input falls below an adjustable level.