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Preparations before startup: 1. Check whether the machine’s wiring is in good condition; verify that the oil level is within the normal range. 2. For water-cooled units, activate the cooling water circulation system and test to ensure it operates properly. 3. Add a small amount of clean engine oil at the intake port; manually rotate the engine (for models with belts or direct connections). 4. Power on the unit and check whether the three-phase power supply is functioning correctly; if there is a cold dryer, start it first. 5. If the machine has not been shut down for too short a period (one to two weeks), it’s not necessary to add oil through the intake valve; when starting the machine, check that the exhaust valve is open. Jogging method: 1. Press the start button; after it has been running for about 5 seconds, press the emergency stop button. Wait for about half a minute (for permanent magnet variable frequency systems, the emergency stop button can be pressed after the preset running time has elapsed). Repeat this process at least 2 times before starting the device normally. 2. If a rapid rise in temperature is observed along with unusual noises at startup, it indicates that the oil inside has not yet circulated; in this case, the machine must be stopped immediately using the emergency stop button, and started again several times. 3. After the machine starts up properly, check the operating data; normal air supply can begin only once the air compressor is running correctly. Precautions during operation: 1. Once the air compressor is operating normally, the personnel responsible for monitoring the compression workshop should conduct regular comprehensive inspections, with at least one inspection per hour. 2. The exhaust temperature during operation must be between 75°C and 95°C to prevent the formation of condensation water that could emulsify the oil. 3. Verify that the pressure gauge and oil level gauge show normal readings; during operation, the oil level must remain between the two red lines. 4. Whether various protection devices are functioning properly. 5. Upon initial startup and after motor maintenance, it is necessary to verify the rotation direction of the compressor. 6. Emergency shutdown must not be used in non-emergency situations. 7. It is strictly prohibited to mix lubricants from different brands. The compressor must be stopped for maintenance when any of the following conditions occur during normal operation: 1. The safety protection device activates automatically, causing the compressor to stop. 2. The cooling fan fails to operate properly due to a malfunction, resulting in excessive motor temperature. 3. The motor ammeter indicates an overload, or there are signs of arcing or burning in the electrical equipment. 4. The safety valve operates or the pressure regulator fails. 5. The compressor and motor produce abnormal noises or vibration. 6. The compressor’s oil and gas tank is leaking oil or air severely. Manual shutdown procedure: 1. Press the “OFF” stop button; wait 10–15 seconds for the control system to take action, after which the compressor will stop. 2. Turn off the system for which the compressor needs to be stopped. 3. Open the drain valve that needs to be shut off. 4. Turn off the main power switch. Special note: When restarting an air compressor after a long period of shutdown, never press the start button directly; otherwise, the compressor’s mechanism may run out of oil and get stuck. It is essential to start it using the jog function! For restarting a dryer: 01 For large-scale cold dryers as well as those equipped with auxiliary heating for the compressor, it is necessary to preheat them for 6–8 hours or more before restarting. After starting, check the drainage performance of the drain device as well as any changes in the dew point. 02 Adsorption dryers: If they are started up again, the dew point of some of these dryers may become unstable; therefore, it is necessary to start them 1-2 days in advance to allow for proper regeneration, ensuring that both the regeneration temperature and the cold blow temperature are within normal ranges. 03 Catalytic oxidation degreaser: It needs to be preheated for 20 minutes before startup; once the desired temperature is reached, it will operate automatically