
To adjust the fan speed using the inverter on your Nor-Ray-Vac system, follow these steps. First, gather the necessary tools: an inverter specific to your system (e.g., 900090 for 2.2kW or 900091 for 1.5kW), a flat head screwdriver, an electrical screwdriver, and a multi-meter. If the inverter came as part of a complete local relay unit, it was likely pre-set at the factory. For a new or replacement stand-alone unit, follow the initial setup procedure in the instruction manual. If replacing an older ATV 11 type inverter, use the provided diagram for the new mounting hole positions. The inverter panel is behind a hinged cover; ensure your local relay unit has a 230V single-phase supply and a three-phase output. Before you begin, isolate the electrical supply to the control panel. Turn on the power; the power-on and system healthy indicator lamps should light up. Next, consult the Nor-Ray-Vac technical manual for precise instructions on adjusting the fan speed via the inverter. This process allows you to fine-tune the fan speed for optimal end vent suction. For detailed information on the inverter and its adjustments, refer to the ABB ACS310 drive user’s manual alongside the Nor-Ray-Vac technical manual. By carefully following these steps and consulting the manuals, you can successfully adjust the fan speed with the inverter to achieve the desired performance from your Nor-Ray-Vac system.


