**Guidelines for Judging and Adjusting the Rotation Direction of Roots Blowers**
The rotation direction of the Roots blower is a key factor in the normal operation of the equipment, and incorrect rotation can lead to serious damage. The following is a detailed explanation and operation guide about the rotation direction:
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**1、 How to determine the correct rotation direction**
1. * * Check the shell identification**
-All Roots blowers are marked with the direction of rotation on the casing or motor (usually indicated by arrows or the letters "CW/CCW").
-* * CW (Clockwise) * *: Clockwise
-* * CCW (Counter Clockwise) * *: counterclockwise
2. * * Factory default direction rules**
-Facing the drive end (coupling/pulley side):
-Most fans rotate clockwise (CW) * * (when viewed from the drive end, the axis turns right).
-Exceptions shall be based on the manufacturer's identification.
3. Airflow verification method**
-Tap start (instant power on), observe the exhaust port:
-* * Correct direction * *: Strong airflow blowing out.
-* * Reverse * *: Exhaust port suction or no airflow.
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**2、 The hazards of incorrect rotation direction**
|* * Problem * * | * * Consequences * *|
|------------------|--------------------------------------|
|* * Rotor collision * * | Impeller wear and deformation, rotor needs to be replaced|
|* * Gear damage * * | Synchronous gear tooth breakage or misalignment|
|* * Bearing overload * * | Early failure caused by abnormal stress|
|* * Performance Failure * * | Unable to establish normal pressure, system cannot function|
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**3、 Method for adjusting the rotation direction**
**1. Adjustment of three-phase motor**
-* * Steps * *:
1. Power off and lock the power supply (LOTO).
2. Arbitrarily swap the * * two-phase power lines * * in the motor junction box (such as swapping L1 and L2).
3. Perform jog testing to confirm direction.
**2. Belt drive adjustment**
-If the motor rotates correctly but the fan reverses:
-Adjust the belt layout to * * parallel drive * * (non cross drive).
**3. Variable frequency drive control adjustment**
-Modify the phase sequence output in the frequency converter parameters (refer to the frequency converter manual).
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**4、 Special precautions**
1. * * Forced reverse operation is strictly prohibited**
-Even short-term reversal may cause rotor collision and must be immediately stopped for correction.
2. * * Reversible Roots blower**
-Very few customized models support bidirectional rotation, but must meet the following requirements:
-The rotor profile is symmetrical (such as a two blade profile).
-The gearbox lubrication system is compatible with both forward and reverse rotation.
3. * * New machine must be inspected upon first startup**
-After installation or maintenance, it is necessary to first jog test the steering before formal operation.
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**5、 Maintenance suggestions**
-* * Regular inspection * *: Check if the gear meshing marks are aligned and if there is any abnormal noise from the bearings.
-Phase protection: Install a phase sequence relay to prevent the power supply from being reversed.
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**Summary**
-Correct steering is a prerequisite for the operation of Roots blower, and it is necessary to operate according to the shell markings.
-When reversing, there is no effective pressure and it may damage the equipment. Immediate correction is required.
-When uncertain about turning, prioritize contacting the manufacturer or professional technicians.
If reverse rotation is found accompanied by abnormal noise, it is recommended to stop the machine for maintenance before use!
