सुधार फीडबैक इकाई आपूर्तिकर्ता आपको याद दिलाता है कि आवृत्ति कनवर्टर द्वारा वोल्टेज तरंग आउटपुट केवल साइन तरंग के समान है, वास्तविक साइन तरंग नहीं है, और इसकी तरंग में बड़ी संख्या में हार्मोनिक घटक शामिल हैं।
As is well known, high-order harmonics can increase the output current of the frequency converter, causing the motor winding to heat up, generating vibration and noise, accelerating insulation aging, and even potentially damaging the motor. At the same time, harmonics of various frequencies can emit radio interference of different programs into space, which may cause misoperation of other electromechanical equipment.
Therefore, when installing a frequency converter, it is necessary to comprehensively consider the distance between the central control room, frequency converter, and motor in order to minimize the impact of harmonics and improve the stability of control.
（1） Definition of Distance:
1. Close range: The distance between the frequency converter and the motor is ≤ 20m;
2. Medium distance: The distance between the frequency converter and the motor is>20m and ≤ 100m;
3. Distance: The distance between the frequency converter and the motor is greater than 100m;
（2） In industrial settings:
1. Close range: The frequency converter and motor can be directly connected;
2. Medium distance: The frequency converter and motor can be directly connected, but the carrier frequency of the frequency converter needs to be adjusted to reduce harmonics and interference;
3. Long distance: The frequency converter and motor can be directly connected, which not only requires adjusting the carrier frequency of the frequency converter to reduce harmonics and interference, but also requires installing an output AC reactor.
（3） In highly automated factories:
In highly automated factories, all equipment needs to be monitored and controlled in the central control room. So, the signal of the frequency converter system also needs to be sent to the central control room.
1. Close range: If the frequency converter is installed in the central control room. The console can be directly connected to the frequency converter and controlled through 0-5/10V voltage signals and some switch signals. However, the electromagnetic radiation of the high-frequency switch signal of the frequency converter may cause some interference to the weak current control signal, so it is not necessary to have a neat and tidy appearance. The frequency converter should be placed in the central control room;
2. Medium distance: refers to the distance between the frequency converter and the central control room, which can be controlled and connected using a 4-20mA current signal and some switch values; If the distance is further, RS485 serial communication can be used for connection;
3. Long distance: that is, the distance between the frequency converter and the central control room is greater than 100m. At this time, communication intermediate relays can be used to achieve a distance of 1km; If it is further away, fiber optic connectors are needed, which can reach up to 23km.
संचार केबलों के उपयोग से, एक बहु-स्तरीय ड्राइव नियंत्रण प्रणाली बनाना आसान है, जिससे मास्टर/स्लेव और सिंक्रोनस नियंत्रण जैसी आवश्यकताओं को पूरा किया जा सकता है। वर्तमान में लोकप्रिय फील्डबस प्रणाली से जुड़ने से डेटा रूपांतरण दर में उल्लेखनीय वृद्धि होगी। केंद्रीय नियंत्रण कक्ष और इन्वर्टर कैबिनेट के बीच की दूरी बढ़ाने से इन्वर्टर और मोटर के बीच की दूरी कम करने में मदद मिलती है, जिससे सिस्टम का प्रदर्शन बेहतर होता है और लेआउट अधिक उचित होता है।