Operation steps, daily maintenance, as well as faults and troubleshooting for Roots blowers

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Roots blower I. Operating steps A. Starting the blower 1. Before operation, thoroughly remove any dust and debris that may be present inside the blower and its intake ducts; ensure that all connecting parts are tightened properly, and that the lubrication system as well as the pressure gauge are in good condition and functional； 2. Open the inlet and outlet valves, and simultaneously turn the shaft by hand to check whether it moves easily ； 3. Connect the power supply, start the fan, and verify its rotation direction; at the same time, check the lubrication level, for any abnormal noises, and for localized heating ； 4. Check whether the current is overloaded, as well as the temperature of the machine’s bearings and for any signs of vibration; if nothing is abnormal, proceed with normal operation. B. Switching or stopping the fan: 1. Start the backup fan following the startup procedure, then press the stop button to shut it down ； 2. Quickly close the inlet and outlet valves. II. Routine Maintenance 1. Regularly check the bearing temperature, noise, vibration levels, and the tightness of the connections ； 2. Check the oil level, oil temperature, and oil quality; ensure proper use of the \"three filters\" and adherence to the \"five fixed principles.\" Generally, the oil should be completely replaced after one quarter of continuous operation ； 3. Regularly check the fan for any abnormalities such as localized temperature increases, and ensure that the cooling water flows smoothly ； 4. The filter should be cleaned regularly to prevent the intake of foreign objects ； 5. Regularly check the condition of the coupling in use ； 6. Pay attention to the cooling water condition of the backup unit to prevent fan damage due to freezing. The causes of failures and corresponding corrective measures are shown in the table below:

| Fan Failure | Cause Analysis | Corrective Measures |
|-------------|----------------|----------------------|
| 1. Insufficient airflow | 1. Belt slippage leading to reduced speed<br>2. Increased clearance<br>3. High inlet resistance | 1. Adjust belt tension or replace with a new belt<br>2. Adjust clearance or replace the rotor<br>3. Clean the filter |
| 2. Motor overload | 1. Clogged filter elements causing high load<br>2. Pressure exceeding specifications<br>3. Friction between the rotor and cylinder | 1. Clean or replace the filter elements<br>2. Ensure the actual operating pressure does not exceed specified values<br>3. Adjust the clearance |
| 3. Overheating | 1. Excessively high pressure<br>2. Poor cooling of the oil tank<br>3. Friction between the rotor and cylinder wall<br>4. Excessive lubricating oil | 1. Check inlet and outlet pressures<br>2. Verify that the cooling water circuit is unobstructed<br>3. Adjust the clearance<br>4. Control the oil level as specified |
| 4. Abnormal noises | 1. Misalignment of gears and rotor<br>2. Severe bearing wear<br>3. Abnormal pressure increase<br>4. Damaged gears | 1. Align and secure them according to specifications<br>2. Replace the bearings<br>3. Identify the cause of the pressure increase<br>4. Replace the gears |
| 5. Failure to start | 1. Blocked inlet/outlet or closed valves<br>2. Incorrect motor wiring or other electrical issues | 1. Remove obstructions or open the valves<br>2. Check the wiring or other electrical components |
| 6. Lubricating oil leakage | 1. Excessively high oil level<br>2. Failed seals | 1. Keep the static oil level 3–5 mm above the mark<br>2. Replace the seals |
| 7. Excessive vibration | 1. Unstable foundation<br>2. Poor alignment of the motor and fan (in directly coupled units)<br>3. Bearing wear | 1. Strengthen the foundation<br>2. Align them according to the manual<br>3. Replace the bearings |