Inverter

The air compressor frequency converter is a customized dedicated frequency converter designed specifically for air compressors, and it falls under the field of industrial automation control.

• Energy-saving control: By adjusting the motor speed, the output power of the air compressor is matched with the actual air consumption, avoiding the waste of electric energy caused by the full-speed operation of traditional air compressors when the air consumption is low. The overall energy saving can reach more than 20%.
• Soft start function: It can make the current rise smoothly when the motor starts and loads, with the maximum not exceeding 1.2 times the rated current. There is no impact at all, which avoids the impact on the power grid and equipment, realizes soft stop, and helps to prolong the service life of the equipment.
• Pressure stability control: After adopting the frequency conversion control system, it can monitor the gas pressure in the gas supply pipeline in real time. Through the pressure sensor and PID adjustment, the stepless setting and closed-loop control of the gas supply pressure are realized, so that the gas pressure in the gas supply pipeline remains constant, improving production efficiency and product quality.
• Flow control: Adjust the motor speed in real time according to the actual air consumption to control the exhaust volume. When the air consumption is low, the air compressor can also automatically hibernate to further reduce energy consumption waste.
• Noise reduction: The frequency converter provides energy according to the air demand. The motor runs at a low frequency, so the mechanical rotation noise is reduced. Moreover, there is no need for repeated loading and unloading, which reduces the noise caused by frequent loading and unloading and unstable air pressure.

• High Reliability: For example, the Inovance MD310 compact multi-function frequency converter for air compressors adopts high-performance current vector control technology, boasting high starting torque performance. When operating at full load, the motor delivers stable rated torque, with minimal speed fluctuation and high speed stabilization accuracy. It also features an "instant power failure non-stop" function, enabling it to maintain operation for a short period in the event of sudden power outages or abrupt voltage drops.
• High Control Precision: Advanced control algorithms—such as vector control and PID regulation—are employed to precisely control the motor’s speed and torque, thereby achieving accurate control of the air compressor. This ensures more stable air supply pressure with minimal pressure fluctuation, making it suitable for production scenarios that demand high air pressure precision.
• Strong Adaptability: It offers a wide voltage adaptation range and can operate normally even in power grid environments with significant voltage fluctuations. Take the Heli 普 (Hai Li Pu) HLP-SK frequency converter as an example: it exhibits strong adaptability to input line voltage, with a permissible fluctuation range of up to ±15%, making it ideal for locations and regions with poor voltage quality.
• High Integration Level: Some air compressor frequency converters integrate multiple functions and interfaces, including a built-in PT100 temperature sensor, a dedicated pressure input interface, and dual PID control (for temperature and pressure), enabling precise control of the air compressor. Additionally, pluggable terminal blocks facilitate wiring and later maintenance. A built-in basic PLC controller is also included, which supports various logic control functions without the need for additional PLCs or air compressor controllers—reducing the overall solution cost.
• Good User-Friendliness: The operation panel provides intuitive displays, simplifying debugging and maintenance. Users can easily set parameters according to actual needs to implement different operating modes and control functions. Some frequency converters also support multiple communication protocols, allowing communication with upper computers or other devices, which facilitates centralized control and remote monitoring.

• Daily Inspection: Regularly check the operating status of the frequency converter, including whether there are abnormal noises or vibrations during motor operation, whether the cooling fan of the frequency converter is working properly, whether the air duct is blocked, whether the frequency converter is overheating, whether screws are loose, and whether there are arcing marks on the terminals.
• Cleaning and Maintenance: Always keep the frequency converter clean. Regularly remove dust from the surface of the frequency converter to prevent dust, especially metal dust, from entering its interior. Periodically clean oil stains from the cooling fan and dust from the air duct of the frequency converter.
• Troubleshooting: When a fault occurs in the frequency converter, promptly identify the cause based on the fault code and take appropriate measures. Do not force the frequency converter to start before the fault is eliminated. For complex faults, contact professional maintenance personnel for repairs.
• Regular Maintenance: In addition to daily inspections and cleaning, conduct more comprehensive maintenance on the frequency converter at regular intervals. This includes checking whether components on the circuit board are aged or damaged, inspecting whether the capacitance of capacitors has decreased, and verifying the condition of braking resistors, etc., to ensure the long-term stable operation of the frequency converter.

Product Features

• Integrated variable frequency drive and control:
  The main unit integrates oil temperature control and fan drive, compatible with both synchronous and asynchronous motor drives, and features dedicated lo design for air compressors, making it easy to debug.
• Easy to Use:
  The product is easy to wire, featuring a plug-and-pull design with anti-misinsertion terminals, which is simple and user-friendly. It has a high overload capacity. The product software is dedicated to this machine and communicates with Longxiang HMI devices for easy debugging, enabling one-click startup.
• Built-in multiple temperature and current protection:
  1. Built-in fan current detection and fan overload protection.2. Built-in fan protection fuse and loading valve protection fuse.3. Built-in air compressor lowtemperature protection (time and temperature can be set). When the cooling fan keeps rotating and the oil temperature fails to reach the oil temperature for water vapor evaporation and is lower than the set protection temperature, the low-temperature protection will report a low-temperature protection fault and shut down after the set fault time (default temperature is 70 degrees, 60 minutes).
• Built-in high-temperature protection:
  When the temperature at the machine head reaches 105 degrees, a warning will be issued. If it remains above 105 degrees for 10 seconds, the machine will shut down directly. Or if the oil temperature rises rapidly to 110 degrees, the machine will stop due to a fault directly.