When using an inverter in conjunction with an automatic control system, it’s important to recognize that the inverter and a regulating valve serve different purposes, which requires careful consideration. For instance, when dealing with the frequency given signal, it’s advisable to use the internationally recognized 4-20 mA signal whenever possible. This not only ensures compatibility but also helps prevent interference from creeping into the inverter system. At industrial sites, there’s often a lot of electrical noise, and this can destabilize the control process. To mitigate this issue, enabling the input filter is crucial. The filter’s setting range typically spans from 0.00 to 5.00 seconds. If the inverter’s built-in PID function is utilized, the feedback filter should also be enabled to enhance the stability of the control loop. The feedback filter’s setting range is broader, extending from 0.0 to 60 seconds. However, it's essential to strike a balance: if the filter time is excessively long, while the control may become stable, the system responsiveness suffers; conversely, if it's too short, the system reacts quickly but becomes prone to instability. Thus, the filter time must be adjusted based on the specific conditions of the site.
Another key aspect is configuring appropriate manual and automatic switching operations. The Communicator offers options like manual, automatic, and forced manual modes. Depending on requirements, redundancy in current and voltage settings could be considered. For example, during normal operation, the inverter’s frequency can be set via current, while in abnormal situations, voltage can be used instead. Adding a potentiometer to allow manual frequency adjustment via voltage ensures dual frequency-setting inputs, thereby improving redundancy and overall system reliability.
It’s equally critical to activate the “inspection switch,†or “in-place maintenance switch,†near rotating machinery. When switched to the “inspection†mode, this effectively disables the inverter’s operational signal loop, preventing accidental activation of equipment during maintenance. This precaution safeguards maintenance personnel working on the machinery.
The inverter’s input and output control terminals should also be fully utilized to integrate alarm and interlock functionalities, reducing wiring complexity and enhancing system reliability.
For simpler systems or standalone applications, leveraging the inverter’s built-in PID control function can significantly simplify the control architecture and lower costs.
Lastly, some inverters feature control power input terminals labeled R0 and T0. It’s recommended to connect the control power to these terminals prior to energizing the main power supply. This ensures the inverter retains its display functionality even after a trip, aiding in diagnosing faults and implementing corrective measures.
In summary, integrating an inverter with an automatic control system demands attention to various details, from signal integrity to redundancy planning and safety features. By carefully considering these aspects, the performance and reliability of the overall system can be greatly enhanced.
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