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Implementing frequency inverter can pay back big benefits, and adopting them is easier than it might seem at first. You just have to follow a few basic guidelines:- What are the torque demands of the loads or processes in your planned system? Will any of the loads be hard to start? Inverters have limited over-current capacity, so hard-to-start loads may require an over-sized unit to cover higher current demands.
- How many motors will the frequency inverter control? If it's more than one, will they start sequentially or simultaneously? Calculate the total peak currents of all motor loads under the worst operating conditions your planned system will see. Size the inverter according to this maximum current requirement.
- Will your applications require a quick start or an emergency stop of the load? If so, high currents will be demanded of the inverter. Over-sizing the frequency inverter may be necessary.
- Is motor overheating a potential concern for any of your planned inverter applications? It may be, for reduced-speed, constant-torque applications.
- What range of motor sizes will your process or processes require the inverter to handle? Remember, smaller motors aren't as efficient as larger ones, so improvements due to the inverter will likely be apparent. However, since large motors use much more power, even small increases in efficiency can produce appreciable savings over the life of the motor.
- Will the inverter system be operating in an environment containing volatiles, airborne particulates or high ambient temperatures? For volatiles, make sure all materials used are resistant to chemicals and are properly grounded. For particulates, ensure proper sealing. For high temperature, allow for needed cooling.
- Do you need equipment or frequency inverter protection features that will ensure continuity in processing? Be aware that you can have a frequency inverter that trips instantly in an over-current condition, or one that maintains constant motor torque and reduces motor speed to maintain current required
- Do you want or need a lot of diagnostic capability in your unit? How critical is it to get a handle on load downtimes and be able to do a detailed fault analysis?
- Are power factor correction capacitors present on the motor loads your inverter system will have to handle? When these are switched, they typically generate power disturbances, and inverters can be negatively impacted. Isolation transformers or line reactors may be necessary.
- Is it possible the power source for your planned system will occasionally be switched while the inverter is operating? This might happen, for example, when loads are switched to stand-by generators during a power outage. Some frequency inverters can handle a brief power outage, while others can't.